OK chaps - suggestions please.

I need to cut a 12" diameter hole in a workshop wall construction of which
is a single skin of 9" x 18" x 4.5" 7 newton concrete blocks. Now I've all
sorts of drills, angle grinders, hammers and even demolition breakers, so
the problem isn't removing the material, the problem is doing it without the
wall collapsing !!!

Current plan is drilling a circle of (say) 1/2" holes with a masonry drill
and wiggling it from both sides to hopefully join them up without disturbing
the rest of the structure. (I'll probably select a spot where the hole is
fully bridged by an 18" block - position within a few inches doesn't matter.

Any other constructive suggestions very welcome.

(this is for a huge 3900 cuM/Hour extractor for a CNC plasma table down
draught exhaust)

Andrew

Andrew Mawson wrote:

OK chaps - suggestions please.

I need to cut a 12" diameter hole in a workshop wall construction of which
is a single skin of 9" x 18" x 4.5" 7 newton concrete blocks. Now I've all
sorts of drills, angle grinders, hammers and even demolition breakers, so
the problem isn't removing the material, the problem is doing it without the
wall collapsing !!!

Current plan is drilling a circle of (say) 1/2" holes with a masonry drill
and wiggling it from both sides to hopefully join them up without disturbing
the rest of the structure. (I'll probably select a spot where the hole is
fully bridged by an 18" block - position within a few inches doesn't matter.

Any other constructive suggestions very welcome.

(this is for a huge 3900 cuM/Hour extractor for a CNC plasma table down
draught exhaust)

Andrew

Should be fine unless the 'lintel' block cracks or moves. Even if it
does, it should be possible to re-mortar and replace as necesary the
blociks above the hole without actually needing to support the wall.
Unless there is a huge load on it, which would be a bit odd for a single
block wall.


--

Roger Hayter

"Andrew Mawson" Wrote in
message:
OK chaps - suggestions please.

I need to cut a 12" diameter hole in a workshop wall construction of which
is a single skin of 9" x 18" x 4.5" 7 newton concrete blocks. Now I've all
sorts of drills, angle grinders, hammers and even demolition breakers, so
the problem isn't removing the material, the problem is doing it without the
wall collapsing !!!

Current plan is drilling a circle of (say) 1/2" holes with a masonry drill
and wiggling it from both sides to hopefully join them up without disturbing
the rest of the structure. (I'll probably select a spot where the hole is
fully bridged by an 18" block - position within a few inches doesn't matter.

Any other constructive suggestions very welcome.

(this is for a huge 3900 cuM/Hour extractor for a CNC plasma table down
draught exhaust)

Andrew


Can you position the hole so the uppermost cut block is left
enough "meat" to work as an arched lintel?

--
Jim K


----Android NewsGroup Reader----
http://usenet.sinaapp.com/

On Thursday, 17 November 2016 20:08:32 UTC, jim wrote:
"Andrew Mawson" Wrote in
message:
OK chaps - suggestions please.

I need to cut a 12" diameter hole in a workshop wall construction of which
is a single skin of 9" x 18" x 4.5" 7 newton concrete blocks. Now I've all
sorts of drills, angle grinders, hammers and even demolition breakers, so
the problem isn't removing the material, the problem is doing it without the
wall collapsing !!!

Current plan is drilling a circle of (say) 1/2" holes with a masonry drill

sounds good, though I hate doing that myself. It makes a simple job take ages and look a mess.

and wiggling it from both sides to hopefully join them up without disturbing

wiggling a drill bit in a hole is asking for trouble.

the rest of the structure. (I'll probably select a spot where the hole is
fully bridged by an 18" block - position within a few inches doesn't matter.

Any other constructive suggestions very welcome.

I'd be tempted to see if I could cut the perimeter with an angle grinder. Held at the right angle the curves would roughly match. AGs are faster than drills and remove a wide slot, they can easily clean up unevenness, and the result would be far neater. If you cut as far as it'd go from both sides, then sliced the remaining centre what's left would be weak.


(this is for a huge 3900 cuM/Hour extractor for a CNC plasma table down
draught exhaust)

Andrew


Can you position the hole so the uppermost cut block is left
enough "meat" to work as an arched lintel?

not much of an issue with a 12" hole in 18" blocks.


NT

On 17/11/2016 19:45, Andrew Mawson wrote:
OK chaps - suggestions please.

I need to cut a 12" diameter hole in a workshop wall construction of
which is a single skin of 9" x 18" x 4.5" 7 newton concrete blocks. Now
I've all sorts of drills, angle grinders, hammers and even demolition
breakers, so the problem isn't removing the material, the problem is
doing it without the wall collapsing !!!

Biggest core drill you have and overlap the holes.
Use a guide hole in a piece of ply to stop the core wandering and you
can get a good finish with a close overlap.
Shouldn't take long with blocks like that.

On 17/11/16 19:45, Andrew Mawson wrote:
OK chaps - suggestions please.

I need to cut a 12" diameter hole in a workshop wall construction ...

The drill used for Hatton Garden isn't doing much if you need it.

(what happens to evidence material such as that? Is it bagged up and
placed forever in storage, destroyed or perhaps sold off to some
ghoulish collector of crime memorabilia?)


(this is for a huge 3900 cuM/Hour extractor for a CNC plasma table down
draught exhaust)

use the plasma cutter?

As a computer programmer I like recursive solutions ...

--
Adrian C

On 17/11/2016 19:45, Andrew Mawson wrote:
OK chaps - suggestions please.

I need to cut a 12" diameter hole in a workshop wall construction of
which is a single skin of 9" x 18" x 4.5" 7 newton concrete blocks. Now
I've all sorts of drills, angle grinders, hammers and even demolition
breakers, so the problem isn't removing the material, the problem is
doing it without the wall collapsing !!!

Current plan is drilling a circle of (say) 1/2" holes with a masonry
drill and wiggling it from both sides to hopefully join them up without
disturbing the rest of the structure. (I'll probably select a spot
where the hole is fully bridged by an 18" block - position within a few
inches doesn't matter.

Any other constructive suggestions very welcome.




Does it _need_ to be a circular hole in the _wall_ or would it work with
circular holes cut with (say) a jigsaw in 2 pieces of (say) plywood
which were screwed to battens (or "angle iron") in a _rectangular_ hole
in the blocks? You could make that rectangular hole with your angle
grinders, hammers, Chieftain tank or whatever other toys we can envy.

And if seriously worried about support, cut "slots" and fit uprights
before removing the central part. (Or should that be a slot and fit a
"lintel"?)

All capale of being tidied up with eg render to match the block?

--
Robin
reply-to address is (intended to be) valid

Wrote in message:
On Thursday, 17 November 2016 20:08:32 UTC, jim wrote:
"Andrew Mawson" Wrote in
message:
OK chaps - suggestions please.

I need to cut a 12" diameter hole in a workshop wall construction of which
is a single skin of 9" x 18" x 4.5" 7 newton concrete blocks. Now I've all
sorts of drills, angle grinders, hammers and even demolition breakers, so
the problem isn't removing the material, the problem is doing it without the
wall collapsing !!!


I'd be tempted to see if I could cut the perimeter with an angle grinder. Held at the right angle the curves would roughly match. AGs are faster than drills and remove a wide slot, they can easily clean up unevenness, and the result would be far neater. If you cut as far as it'd go from both sides, then sliced the remaining centre what's left would be weak.


Faster than a drill until you clean all the resulting mess up..

(this is for a huge 3900 cuM/Hour extractor for a CNC plasma table down
draught exhaust)

Andrew


Can you position the hole so the uppermost cut block is left
enough "meat" to work as an arched lintel?

not much of an issue with a 12" hole in 18" blocks.

Mmm & where do you sign again ?

--
Jim K


----Android NewsGroup Reader----
http://usenet.sinaapp.com/

On Thursday, 17 November 2016 22:08:02 UTC, jim wrote:
tabbypurr Wrote in message:
On Thursday, 17 November 2016 20:08:32 UTC, jim wrote:
"Andrew Mawson" Wrote in
message:
OK chaps - suggestions please.

I need to cut a 12" diameter hole in a workshop wall construction of which
is a single skin of 9" x 18" x 4.5" 7 newton concrete blocks. Now I've all
sorts of drills, angle grinders, hammers and even demolition breakers, so
the problem isn't removing the material, the problem is doing it without the
wall collapsing !!!


I'd be tempted to see if I could cut the perimeter with an angle grinder. Held at the right angle the curves would roughly match. AGs are faster than drills and remove a wide slot, they can easily clean up unevenness, and the result would be far neater. If you cut as far as it'd go from both sides, then sliced the remaining centre what's left would be weak.


Faster than a drill until you clean all the resulting mess up..

So another job you've never done.

Wrote in message:
On Thursday, 17 November 2016 22:08:02 UTC, jim wrote:
tabbypurr Wrote in message:
On Thursday, 17 November 2016 20:08:32 UTC, jim wrote:
"Andrew Mawson" Wrote in
message:
OK chaps - suggestions please.

I need to cut a 12" diameter hole in a workshop wall construction of which
is a single skin of 9" x 18" x 4.5" 7 newton concrete blocks. Now I've all
sorts of drills, angle grinders, hammers and even demolition breakers, so
the problem isn't removing the material, the problem is doing it without the
wall collapsing !!!


I'd be tempted to see if I could cut the perimeter with an angle grinder. Held at the right angle the curves would roughly match. AGs are faster than drills and remove a wide slot, they can easily clean up unevenness, and the result would be far neater. If you cut as far as it'd go from both sides, then sliced the remaining centre what's left would be weak.


Faster than a drill until you clean all the resulting mess up..

So another job you've never done.


Says you of all people :-D :-D

--
Jim K


----Android NewsGroup Reader----
http://usenet.sinaapp.com/

On 17/11/2016 19:45, Andrew Mawson wrote:
OK chaps - suggestions please.

I need to cut a 12" diameter hole in a workshop wall construction of
which is a single skin of 9" x 18" x 4.5" 7 newton concrete blocks. Now
I've all sorts of drills, angle grinders, hammers and even demolition
breakers, so the problem isn't removing the material, the problem is
doing it without the wall collapsing !!!

12" is really not a large hole - old boiler flues were frequently as
large as this.

Stitch drill and break out the middle with a SDS would be one approach.

If you want a neater round hole, overlapping core drilling also works.

You may be able to hire core kit large enough to do it as a single core.

Alternatively just chisel out the mortar and remove hole blocks, then
fill in round your exist pipe with new mortar and bricks (or bits of)


There are also firms that specialise in this kind of thing. A local one
here for example:

http://kssdiamonddrilling.co.uk/diamond-drilling/

(they claim they can do a 1.5m hole!)

(this is for a huge 3900 cuM/Hour extractor for a CNC plasma table down
draught exhaust)

Now this sounds like fun ;-)


--
Cheers,

John.

/================================================== ===============\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\================================================= ================/

On Friday, 18 November 2016 01:02:48 UTC, John Rumm wrote:
On 17/11/2016 19:45, Andrew Mawson wrote:
OK chaps - suggestions please.

I need to cut a 12" diameter hole in a workshop wall construction of
which is a single skin of 9" x 18" x 4.5" 7 newton concrete blocks. Now
I've all sorts of drills, angle grinders, hammers and even demolition
breakers, so the problem isn't removing the material, the problem is
doing it without the wall collapsing !!!

12" is really not a large hole - old boiler flues were frequently as
large as this.

Stitch drill and break out the middle with a SDS would be one approach.

If you want a neater round hole, overlapping core drilling also works.

You may be able to hire core kit large enough to do it as a single core.

I suspect it'd be as cheap to rebuild the wall as hire the tool.


NT

On 17/11/16 21:46, Robin wrote:
On 17/11/2016 19:45, Andrew Mawson wrote:
OK chaps - suggestions please.

I need to cut a 12" diameter hole in a workshop wall construction of
which is a single skin of 9" x 18" x 4.5" 7 newton concrete blocks. Now
I've all sorts of drills, angle grinders, hammers and even demolition
breakers, so the problem isn't removing the material, the problem is
doing it without the wall collapsing !!!

Current plan is drilling a circle of (say) 1/2" holes with a masonry
drill and wiggling it from both sides to hopefully join them up without
disturbing the rest of the structure. (I'll probably select a spot
where the hole is fully bridged by an 18" block - position within a few
inches doesn't matter.

Any other constructive suggestions very welcome.




Does it _need_ to be a circular hole in the _wall_ or would it work with
circular holes cut with (say) a jigsaw in 2 pieces of (say) plywood
which were screwed to battens (or "angle iron") in a _rectangular_ hole
in the blocks? You could make that rectangular hole with your angle
grinders, hammers, Chieftain tank or whatever other toys we can envy.

And if seriously worried about support, cut "slots" and fit uprights
before removing the central part. (Or should that be a slot and fit a
"lintel"?)

All capale of being tidied up with eg render to match the block?


I think this is actually a plan. Remove a whole block from the wall, and
pout the pipe through and make good with fresh concrete.


--
Future generations will wonder in bemused amazement that the early
twenty-first centurys developed world went into hysterical panic over a
globally average temperature increase of a few tenths of a degree, and,
on the basis of gross exaggerations of highly uncertain computer
projections combined into implausible chains of inference, proceeded to
contemplate a rollback of the industrial age.

Richard Lindzen

Wrote in message:
On Friday, 18 November 2016 01:02:48 UTC, John Rumm wrote:
On 17/11/2016 19:45, Andrew Mawson wrote:
OK chaps - suggestions please.

I need to cut a 12" diameter hole in a workshop wall construction of
which is a single skin of 9" x 18" x 4.5" 7 newton concrete blocks. Now
I've all sorts of drills, angle grinders, hammers and even demolition
breakers, so the problem isn't removing the material, the problem is
doing it without the wall collapsing !!!

12" is really not a large hole - old boiler flues were frequently as
large as this.

Stitch drill and break out the middle with a SDS would be one approach.

If you want a neater round hole, overlapping core drilling also works.

You may be able to hire core kit large enough to do it as a single core.

I suspect it'd be as cheap to rebuild the wall as hire the tool.


NT


What price time & inconvenience?....

--
Jim K


----Android NewsGroup Reader----
http://usenet.sinaapp.com/

On Friday, 18 November 2016 09:37:35 UTC, jim wrote:
tabbypurr Wrote in message:
On Friday, 18 November 2016 01:02:48 UTC, John Rumm wrote:
On 17/11/2016 19:45, Andrew Mawson wrote:
OK chaps - suggestions please.

I need to cut a 12" diameter hole in a workshop wall construction of
which is a single skin of 9" x 18" x 4.5" 7 newton concrete blocks. Now
I've all sorts of drills, angle grinders, hammers and even demolition
breakers, so the problem isn't removing the material, the problem is
doing it without the wall collapsing !!!

12" is really not a large hole - old boiler flues were frequently as
large as this.

Stitch drill and break out the middle with a SDS would be one approach..

If you want a neater round hole, overlapping core drilling also works.

You may be able to hire core kit large enough to do it as a single core.

I suspect it'd be as cheap to rebuild the wall as hire the tool.

What price time & inconvenience?....

A 4" hand held core drill is about £60 a day from HSS. You can look up 12" if you want. I doubt it's worth it.


NT

Wrote in message:
On Friday, 18 November 2016 09:37:35 UTC, jim wrote:
tabbypurr Wrote in message:
On Friday, 18 November 2016 01:02:48 UTC, John Rumm wrote:
On 17/11/2016 19:45, Andrew Mawson wrote:
OK chaps - suggestions please.

I need to cut a 12" diameter hole in a workshop wall construction of
which is a single skin of 9" x 18" x 4.5" 7 newton concrete blocks. Now
I've all sorts of drills, angle grinders, hammers and even demolition
breakers, so the problem isn't removing the material, the problem is
doing it without the wall collapsing !!!

12" is really not a large hole - old boiler flues were frequently as
large as this.

Stitch drill and break out the middle with a SDS would be one approach.

If you want a neater round hole, overlapping core drilling also works.

You may be able to hire core kit large enough to do it as a single core.

I suspect it'd be as cheap to rebuild the wall as hire the tool.

What price time & inconvenience?....

A 4" hand held core drill is about £60 a day from HSS. You can look up 12" if you want. I doubt it's worth it.


NT


Ha! - More guesswork from "Not Tried Nige" then :-)

Though I do think your "dust free, wide slot angle grinding
through concrete" idea needs pursuing, assuming you didn't
imagine all that as well?

;-)

--
Jim K


----Android NewsGroup Reader----
http://usenet.sinaapp.com/

On Friday, 18 November 2016 13:58:00 UTC, jim wrote:
tabbypurr Wrote in message:
On Friday, 18 November 2016 09:37:35 UTC, jim wrote:
tabbypurr Wrote in message:
On Friday, 18 November 2016 01:02:48 UTC, John Rumm wrote:
On 17/11/2016 19:45, Andrew Mawson wrote:
OK chaps - suggestions please.

I need to cut a 12" diameter hole in a workshop wall construction of
which is a single skin of 9" x 18" x 4.5" 7 newton concrete blocks. Now
I've all sorts of drills, angle grinders, hammers and even demolition
breakers, so the problem isn't removing the material, the problem is
doing it without the wall collapsing !!!

12" is really not a large hole - old boiler flues were frequently as
large as this.

Stitch drill and break out the middle with a SDS would be one approach.

If you want a neater round hole, overlapping core drilling also works.

You may be able to hire core kit large enough to do it as a single core.

I suspect it'd be as cheap to rebuild the wall as hire the tool.

What price time & inconvenience?....

A 4" hand held core drill is about £60 a day from HSS. You can look up 12" if you want. I doubt it's worth it.

Ha! - More guesswork from "Not Tried Nige" then :-)

No, that was from HSS Hire.

Though I do think your "dust free, wide slot angle grinding
through concrete" idea needs pursuing, assuming you didn't
imagine all that as well?

;-)

I doubt anyone has ever claimed angle grinding masonry to be dust free. I certainly haven't. But I can confidently claim you have the mentality of a primary school child.


NT

On 18/11/2016 10:02, The Natural Philosopher wrote:

I think this is actually a plan. Remove a whole block from the wall, and
pout the pipe through and make good with fresh concrete.

I suspect the extracted air will go through any shape hole without
complaining. Does it even need to be 12" just because the fan is that
diameter?

On 18/11/2016 19:17, GB wrote:
On 18/11/2016 10:02, The Natural Philosopher wrote:

I think this is actually a plan. Remove a whole block from the wall, and
pout the pipe through and make good with fresh concrete.

I suspect the extracted air will go through any shape hole without
complaining. Does it even need to be 12" just because the fan is that
diameter?

Hmm, just re-read the OP. The fan is moving 1m3 per second, so that
would need a decent hole, I guess.

On 11/18/2016 1:02 AM, John Rumm wrote:
On 17/11/2016 19:45, Andrew Mawson wrote:
OK chaps - suggestions please.

I need to cut a 12" diameter hole in a workshop wall construction of
which is a single skin of 9" x 18" x 4.5" 7 newton concrete blocks. Now
I've all sorts of drills, angle grinders, hammers and even demolition
breakers, so the problem isn't removing the material, the problem is
doing it without the wall collapsing !!!

12" is really not a large hole - old boiler flues were frequently as
large as this.

Stitch drill and break out the middle with a SDS would be one approach.

If you want a neater round hole, overlapping core drilling also works.

You may be able to hire core kit large enough to do it as a single core.

Alternatively just chisel out the mortar and remove hole blocks, then
fill in round your exist pipe with new mortar and bricks (or bits of)


There are also firms that specialise in this kind of thing. A local one
here for example:

http://kssdiamonddrilling.co.uk/diamond-drilling/

(they claim they can do a 1.5m hole!)

(this is for a huge 3900 cuM/Hour extractor for a CNC plasma table down
draught exhaust)

Now this sounds like fun ;-)


My first thoughts are that either stitch drilling or removing one block
and making good afterwards would be fine.

But also agree with John about diamond drilling. One of my lads just
converted a shop unit in a modern complex into a bar, which meant
putting in loos on two floors. He was convinced the only solution for
one loo was a macerator because of the building geometry. I pointed out
that a six inch hole in the concrete floor (about a foot thick) would
give an easy run for conventional soil pipes. A local firm did it for
him for £300 in a couple of hours (that includes all the humping of kit
and cleaning up afterwards). I think the price would have covered half a
day's work, which was their upper bound estimate if there was much rebar.

GB wrote:

On 18/11/2016 19:17, GB wrote:
On 18/11/2016 10:02, The Natural Philosopher wrote:

I think this is actually a plan. Remove a whole block from the wall, and
pout the pipe through and make good with fresh concrete.

I suspect the extracted air will go through any shape hole without
complaining. Does it even need to be 12" just because the fan is that
diameter?

Hmm, just re-read the OP. The fan is moving 1m3 per second, so that
would need a decent hole, I guess.

Presumably it includes an inlet as well as an exhaust. Otherwise
asphyxiation and the walls falling in would be a risk.

--

Roger Hayter

Wrote in message:
On Friday, 18 November 2016 13:58:00 UTC, jim wrote:
tabbypurr Wrote in message:
On Friday, 18 November 2016 09:37:35 UTC, jim wrote:
tabbypurr Wrote in message:
On Friday, 18 November 2016 01:02:48 UTC, John Rumm wrote:
On 17/11/2016 19:45, Andrew Mawson wrote:
OK chaps - suggestions please.

I need to cut a 12" diameter hole in a workshop wall construction of
which is a single skin of 9" x 18" x 4.5" 7 newton concrete blocks. Now
I've all sorts of drills, angle grinders, hammers and even demolition
breakers, so the problem isn't removing the material, the problem is
doing it without the wall collapsing !!!

12" is really not a large hole - old boiler flues were frequently as
large as this.

Stitch drill and break out the middle with a SDS would be one approach.

If you want a neater round hole, overlapping core drilling also works.

You may be able to hire core kit large enough to do it as a single core.

I suspect it'd be as cheap to rebuild the wall as hire the tool.

What price time & inconvenience?....

A 4" hand held core drill is about £60 a day from HSS. You can look up 12" if you want. I doubt it's worth it.

Ha! - More guesswork from "Not Tried Nige" then :-)

No, that was from HSS Hire.

Though I do think your "dust free, wide slot angle grinding
through concrete" idea needs pursuing, assuming you didn't
imagine all that as well?

;-)

I doubt anyone has ever claimed angle grinding masonry to be dust free. I certainly haven't. But I can confidently claim you have the mentality of a primary school child.


NT


God you are still utterly boring and predictable nige, but hey
let's review this thread's gems of your ****wittery...

In response to my observation to your "cut through a concrete wall
with an angle grinder" advocation....

JimK :-Faster than a drill until you clean all the resulting mess up..

Who said:-
NoNowtNige:- "So another job you've never done."

Have I cut concrete blocks with an angle grinder? Of course I have.

Have *you* really ever done it nige? How did you control the
incredible amounts of dust this method clearly & numb****ingly
obviously makes nige?

Indeed I think primary school kids will be able to think through
problems and generate solutions better than you can imagine in
your smelly old armchair, even though you claim to have all the T
shirts - saddo!

;-)
--
Jim K


----Android NewsGroup Reader----
http://usenet.sinaapp.com/

(Roger Hayter) Wrote in message:
GB wrote:

On 18/11/2016 19:17, GB wrote:
On 18/11/2016 10:02, The Natural Philosopher wrote:

I think this is actually a plan. Remove a whole block from the wall, and
pout the pipe through and make good with fresh concrete.

I suspect the extracted air will go through any shape hole without
complaining. Does it even need to be 12" just because the fan is that
diameter?

Hmm, just re-read the OP. The fan is moving 1m3 per second, so that
would need a decent hole, I guess.

Presumably it includes an inlet as well as an exhaust. Otherwise
asphyxiation and the walls falling in would be a risk.


Get rid of NoNowtNige's angle grinder dusttoo....
--
Jim K


----Android NewsGroup Reader----
http://usenet.sinaapp.com/

"GB" wrote in message news

On 18/11/2016 19:17, GB wrote:
On 18/11/2016 10:02, The Natural Philosopher wrote:

I think this is actually a plan. Remove a whole block from the wall, and
pout the pipe through and make good with fresh concrete.

I suspect the extracted air will go through any shape hole without
complaining. Does it even need to be 12" just because the fan is that
diameter?

Hmm, just re-read the OP. The fan is moving 1m3 per second, so that would
need a decent hole, I guess.



The fan arrived today - by heck it shifts some air - no way of measuring if
it's the claimed 3900 cu/M / Hour but it's certainly impressive

Andrew

On Friday, 18 November 2016 21:17:21 UTC, jim wrote:
tabbypurr Wrote in message:
On Friday, 18 November 2016 13:58:00 UTC, jim wrote:
tabbypurr Wrote in message:
On Friday, 18 November 2016 09:37:35 UTC, jim wrote:
tabbypurr Wrote in message:
On Friday, 18 November 2016 01:02:48 UTC, John Rumm wrote:
On 17/11/2016 19:45, Andrew Mawson wrote:
OK chaps - suggestions please.

I need to cut a 12" diameter hole in a workshop wall construction of
which is a single skin of 9" x 18" x 4.5" 7 newton concrete blocks. Now
I've all sorts of drills, angle grinders, hammers and even demolition
breakers, so the problem isn't removing the material, the problem is
doing it without the wall collapsing !!!

12" is really not a large hole - old boiler flues were frequently as
large as this.

Stitch drill and break out the middle with a SDS would be one approach.

If you want a neater round hole, overlapping core drilling also works.

You may be able to hire core kit large enough to do it as a single core.

I suspect it'd be as cheap to rebuild the wall as hire the tool.

What price time & inconvenience?....

A 4" hand held core drill is about £60 a day from HSS. You can look up 12" if you want. I doubt it's worth it.

Ha! - More guesswork from "Not Tried Nige" then :-)

No, that was from HSS Hire.

Though I do think your "dust free, wide slot angle grinding
through concrete" idea needs pursuing, assuming you didn't
imagine all that as well?

;-)

I doubt anyone has ever claimed angle grinding masonry to be dust free. I certainly haven't. But I can confidently claim you have the mentality of a primary school child.

God you are still utterly boring and predictable nige, but hey
let's review this thread's gems of your ****wittery...

In response to my observation to your "cut through a concrete wall
with an angle grinder" advocation....

JimK :-Faster than a drill until you clean all the resulting mess up..

Who said:-
NoNowtNige:- "So another job you've never done."

Have I cut concrete blocks with an angle grinder? Of course I have.

Have *you* really ever done it nige? How did you control the
incredible amounts of dust this method clearly & numb****ingly
obviously makes nige?

Indeed I think primary school kids will be able to think through
problems and generate solutions better than you can imagine in
your smelly old armchair, even though you claim to have all the T
shirts - saddo!

;-)

I'm pretty sure I can recall what was said already thanks. I control AG masonry dust with a cyclone vacuum cleaner. It catches almost all of it, and transforms that dirt from hell into a more normal clean up. Other domestic vacs clog very quickly.

And yes, I've made holes in masonry walls with core drills, chain drilling and just chiselling. That's precisely why I don't recommend chain drilling as the choice option. It's a PITA and the result is not neat & tidy. The OP can of course follow this slow coach jimmy if he wants, it won't affect my life one iota.


NT

Wrote in message:
On Friday, 18 November 2016 21:17:21 UTC, jim wrote:
tabbypurr Wrote in message:
On Friday, 18 November 2016 13:58:00 UTC, jim wrote:
tabbypurr Wrote in message:
On Friday, 18 November 2016 09:37:35 UTC, jim wrote:
tabbypurr Wrote in message:
On Friday, 18 November 2016 01:02:48 UTC, John Rumm wrote:
On 17/11/2016 19:45, Andrew Mawson wrote:
OK chaps - suggestions please.

I need to cut a 12" diameter hole in a workshop wall construction of
which is a single skin of 9" x 18" x 4.5" 7 newton concrete blocks. Now
I've all sorts of drills, angle grinders, hammers and even demolition
breakers, so the problem isn't removing the material, the problem is
doing it without the wall collapsing !!!

12" is really not a large hole - old boiler flues were frequently as
large as this.

Stitch drill and break out the middle with a SDS would be one approach.

If you want a neater round hole, overlapping core drilling also works.

You may be able to hire core kit large enough to do it as a single core.

I suspect it'd be as cheap to rebuild the wall as hire the tool.

What price time & inconvenience?....

A 4" hand held core drill is about £60 a day from HSS. You can look up 12" if you want. I doubt it's worth it.

Ha! - More guesswork from "Not Tried Nige" then :-)

No, that was from HSS Hire.

Though I do think your "dust free, wide slot angle grinding
through concrete" idea needs pursuing, assuming you didn't
imagine all that as well?

;-)

I doubt anyone has ever claimed angle grinding masonry to be dust free. I certainly haven't. But I can confidently claim you have the mentality of a primary school child.

God you are still utterly boring and predictable nige, but hey
let's review this thread's gems of your ****wittery...

In response to my observation to your "cut through a concrete wall
with an angle grinder" advocation....

JimK :-Faster than a drill until you clean all the resulting mess up..

Who said:-
NoNowtNige:- "So another job you've never done."

Have I cut concrete blocks with an angle grinder? Of course I have.

Have *you* really ever done it nige? How did you control the
incredible amounts of dust this method clearly & numb****ingly
obviously makes nige?

Indeed I think primary school kids will be able to think through
problems and generate solutions better than you can imagine in
your smelly old armchair, even though you claim to have all the T
shirts - saddo!

;-)

I'm pretty sure I can recall what was said already thanks. I control AG masonry dust with a cyclone vacuum cleaner.

I don't believe you have ever done that successfully.
Post us a picture of your dust collecting concrete cutting angle
grinder setup nige - stick it on your wiki too - should be
trivial enough & useful for others to learn from ? :-)


I fully expect the usual "far too busy", or "everyone will already
know what you mean so there's no point" or some other cop out
reason will be forthcoming for obvious bull****ty
reasons.

And yes, I've made holes in masonry walls with core drills, chain drilling and just chiselling.

And angle grinders apparently!

That's precisely why I don't recommend chain drilling as the
choice option. It's a PITA and the result is not neat & tidy.


I doubt it matters too much, it will all need sealing anyway & it
sounds like a light industrial environment. You did spot that too
before your rambling started didn't you?

The OP can of course follow this slow coach jimmy if he wants, it
won't affect my life one iota.

Hehe - It couldn't make it any worse could it saddo ;-)

--
Jim K


----Android NewsGroup Reader----
http://usenet.sinaapp.com/

On Saturday, 19 November 2016 09:14:05 UTC, jim wrote:
tabbypurr Wrote in message:
On Friday, 18 November 2016 21:17:21 UTC, jim wrote:
tabbypurr Wrote in message:
On Friday, 18 November 2016 13:58:00 UTC, jim wrote:
tabbypurr Wrote in message:
On Friday, 18 November 2016 09:37:35 UTC, jim wrote:
tabbypurr Wrote in message:
On Friday, 18 November 2016 01:02:48 UTC, John Rumm wrote:
On 17/11/2016 19:45, Andrew Mawson wrote:
OK chaps - suggestions please.

I need to cut a 12" diameter hole in a workshop wall construction of
which is a single skin of 9" x 18" x 4.5" 7 newton concrete blocks. Now
I've all sorts of drills, angle grinders, hammers and even demolition
breakers, so the problem isn't removing the material, the problem is
doing it without the wall collapsing !!!

12" is really not a large hole - old boiler flues were frequently as
large as this.

Stitch drill and break out the middle with a SDS would be one approach.

If you want a neater round hole, overlapping core drilling also works.

You may be able to hire core kit large enough to do it as a single core.

I suspect it'd be as cheap to rebuild the wall as hire the tool.

What price time & inconvenience?....

A 4" hand held core drill is about £60 a day from HSS. You can look up 12" if you want. I doubt it's worth it.

Ha! - More guesswork from "Not Tried Nige" then :-)

No, that was from HSS Hire.

Though I do think your "dust free, wide slot angle grinding
through concrete" idea needs pursuing, assuming you didn't
imagine all that as well?

;-)

I doubt anyone has ever claimed angle grinding masonry to be dust free. I certainly haven't. But I can confidently claim you have the mentality of a primary school child.

God you are still utterly boring and predictable nige, but hey
let's review this thread's gems of your ****wittery...

In response to my observation to your "cut through a concrete wall
with an angle grinder" advocation....

JimK :-Faster than a drill until you clean all the resulting mess up..

Who said:-
NoNowtNige:- "So another job you've never done."

Have I cut concrete blocks with an angle grinder? Of course I have.

Have *you* really ever done it nige? How did you control the
incredible amounts of dust this method clearly & numb****ingly
obviously makes nige?

Indeed I think primary school kids will be able to think through
problems and generate solutions better than you can imagine in
your smelly old armchair, even though you claim to have all the T
shirts - saddo!

;-)

I'm pretty sure I can recall what was said already thanks. I control AG masonry dust with a cyclone vacuum cleaner.

I don't believe you have ever done that successfully.
Post us a picture of your dust collecting concrete cutting angle
grinder setup nige - stick it on your wiki too - should be
trivial enough & useful for others to learn from ? :-)


I fully expect the usual "far too busy", or "everyone will already
know what you mean so there's no point" or some other cop out
reason will be forthcoming for obvious bull****ty
reasons.

And yes, I've made holes in masonry walls with core drills, chain drilling and just chiselling.

And angle grinders apparently!

That's precisely why I don't recommend chain drilling as the
choice option. It's a PITA and the result is not neat & tidy.


I doubt it matters too much, it will all need sealing anyway & it
sounds like a light industrial environment. You did spot that too
before your rambling started didn't you?

The OP can of course follow this slow coach jimmy if he wants, it
won't affect my life one iota.

Hehe - It couldn't make it any worse could it saddo ;-)

thank you for confirming you have some sort of mental issue going on. I don't care, you can troll by yourself. Enjoy your problems.


NT

On 18/11/2016 21:17, jim wrote:
Wrote in message:
On Friday, 18 November 2016 13:58:00 UTC, jim wrote:
tabbypurr Wrote in message:
On Friday, 18 November 2016 09:37:35 UTC, jim wrote:
tabbypurr Wrote in message:
On Friday, 18 November 2016 01:02:48 UTC, John Rumm
wrote:
On 17/11/2016 19:45, Andrew Mawson wrote:
OK chaps - suggestions please.

I need to cut a 12" diameter hole in a workshop wall
construction of which is a single skin of 9" x 18" x
4.5" 7 newton concrete blocks. Now I've all sorts of
drills, angle grinders, hammers and even demolition
breakers, so the problem isn't removing the material,
the problem is doing it without the wall collapsing
!!!

12" is really not a large hole - old boiler flues were
frequently as large as this.

Stitch drill and break out the middle with a SDS would be
one approach.

If you want a neater round hole, overlapping core
drilling also works.

You may be able to hire core kit large enough to do it as
a single core.

I suspect it'd be as cheap to rebuild the wall as hire the
tool.

What price time & inconvenience?....

A 4" hand held core drill is about £60 a day from HSS. You can
look up 12" if you want. I doubt it's worth it.

Ha! - More guesswork from "Not Tried Nige" then :-)

No, that was from HSS Hire.

Though I do think your "dust free, wide slot angle grinding
through concrete" idea needs pursuing, assuming you didn't
imagine all that as well?

;-)

I doubt anyone has ever claimed angle grinding masonry to be dust
free. I certainly haven't. But I can confidently claim you have the
mentality of a primary school child.


NT


God you are still utterly boring and predictable nige, but hey let's
review this thread's gems of your ****wittery...

In response to my observation to your "cut through a concrete wall
with an angle grinder" advocation....

JimK :-Faster than a drill until you clean all the resulting mess
up..

Who said:- NoNowtNige:- "So another job you've never done."

Have I cut concrete blocks with an angle grinder? Of course I have.

Have *you* really ever done it nige? How did you control the
incredible amounts of dust this method clearly & numb****ingly
obviously makes nige?

Indeed I think primary school kids will be able to think through
problems and generate solutions better than you can imagine in your
smelly old armchair, even though you claim to have all the T shirts -
saddo!

;-)

Generally when you resort to abuse you've lost the argument.

When you respond to:
---------------------------------
Faster than a drill until you clean all the resulting mess up.

So another job you've never done.
---------------------------------

and explain how your method doesn't make dust, we'll all be very impressed.

On Saturday, 19 November 2016 14:26:31 UTC, Fredxxx wrote:
On 18/11/2016 21:17, jim wrote:

God you are still utterly boring and predictable nige, but hey let's
review this thread's gems of your ****wittery...

In response to my observation to your "cut through a concrete wall
with an angle grinder" advocation....

JimK :-Faster than a drill until you clean all the resulting mess
up..

Who said:- NoNowtNige:- "So another job you've never done."

Have I cut concrete blocks with an angle grinder? Of course I have.

Have *you* really ever done it nige? How did you control the
incredible amounts of dust this method clearly & numb****ingly
obviously makes nige?

Indeed I think primary school kids will be able to think through
problems and generate solutions better than you can imagine in your
smelly old armchair, even though you claim to have all the T shirts -
saddo!

;-)

Generally when you resort to abuse you've lost the argument.

His argument is that no matter what I say I must have never done it and not know what I'm talking about. No amount of explanation, pictures, stating the obvious or anything else results in him realising he's being an idiot. He plainly has some kind of problem. Fixed irrational beliefs are classic signs of mental illness, ditto having hatred of someone for no sensible reason. Perhaps that's it, who knows.

And if he can't even work out how to position a vacuum cleaner hose nozzle, maybe he should leave the power tools alone.



When you respond to:
---------------------------------
Faster than a drill until you clean all the resulting mess up.

So another job you've never done.
---------------------------------

and explain how your method doesn't make dust, we'll all be very impressed.

I already did. There's nothing impressive about it.


NT

On Friday, 18 November 2016 22:36:09 UTC, Andrew Mawson wrote:
"GB" wrote in message news

On 18/11/2016 19:17, GB wrote:
On 18/11/2016 10:02, The Natural Philosopher wrote:

I think this is actually a plan. Remove a whole block from the wall, and
pout the pipe through and make good with fresh concrete.

I suspect the extracted air will go through any shape hole without
complaining. Does it even need to be 12" just because the fan is that
diameter?

Hmm, just re-read the OP. The fan is moving 1m3 per second, so that would
need a decent hole, I guess.



The fan arrived today - by heck it shifts some air - no way of measuring if
it's the claimed 3900 cu/M / Hour but it's certainly impressive

Andrew

That is without air flow restriction.
The actual flow with depend on the length of ducting, diameter, number of bends and the friction of the duct wall..

The power consumed will vary on the air shifted and the pressure caused by the restrictions.

Fredxxx Wrote in message:
On 18/11/2016 21:17, jim wrote:
Wrote in message:
On Friday, 18 November 2016 13:58:00 UTC, jim wrote:
tabbypurr Wrote in message:
On Friday, 18 November 2016 09:37:35 UTC, jim wrote:
tabbypurr Wrote in message:
On Friday, 18 November 2016 01:02:48 UTC, John Rumm
wrote:
On 17/11/2016 19:45, Andrew Mawson wrote:
OK chaps - suggestions please.

I need to cut a 12" diameter hole in a workshop wall
construction of which is a single skin of 9" x 18" x
4.5" 7 newton concrete blocks. Now I've all sorts of
drills, angle grinders, hammers and even demolition
breakers, so the problem isn't removing the material,
the problem is doing it without the wall collapsing
!!!

12" is really not a large hole - old boiler flues were
frequently as large as this.

Stitch drill and break out the middle with a SDS would be
one approach.

If you want a neater round hole, overlapping core
drilling also works.

You may be able to hire core kit large enough to do it as
a single core.

I suspect it'd be as cheap to rebuild the wall as hire the
tool.

What price time & inconvenience?....

A 4" hand held core drill is about £60 a day from HSS. You can
look up 12" if you want. I doubt it's worth it.

Ha! - More guesswork from "Not Tried Nige" then :-)

No, that was from HSS Hire.

Though I do think your "dust free, wide slot angle grinding
through concrete" idea needs pursuing, assuming you didn't
imagine all that as well?

;-)

I doubt anyone has ever claimed angle grinding masonry to be dust
free. I certainly haven't. But I can confidently claim you have the
mentality of a primary school child.


NT


God you are still utterly boring and predictable nige, but hey let's
review this thread's gems of your ****wittery...

In response to my observation to your "cut through a concrete wall
with an angle grinder" advocation....

JimK :-Faster than a drill until you clean all the resulting mess
up..

Who said:- NoNowtNige:- "So another job you've never done."

Have I cut concrete blocks with an angle grinder? Of course I have.

Have *you* really ever done it nige? How did you control the
incredible amounts of dust this method clearly & numb****ingly
obviously makes nige?

Indeed I think primary school kids will be able to think through
problems and generate solutions better than you can imagine in your
smelly old armchair, even though you claim to have all the T shirts -
saddo!

;-)

Generally when you resort to abuse you've lost the argument.

When you respond to:
---------------------------------
Faster than a drill until you clean all the resulting mess up.

So another job you've never done.
---------------------------------

and explain how your method doesn't make dust, we'll all be very impressed.


Who are you replying to?

--
Jim K


----Android NewsGroup Reader----
http://usenet.sinaapp.com/

Wrote in message:

His argument is that no matter what I say I must have never done it and not know what I'm talking about. No amount of explanation, pictures, stating the obvious or anything else results in him realising he's being an idiot. He plainly has some kind of problem. Fixed irrational beliefs are classic signs of mental illness, ditto having hatred of someone for no sensible reason. Perhaps that's it, who knows.


So no more info then? As I believe I predicted, it is a hallmark
of all your trolling "contributions" to this ng NoNowtNige.


I suspect you have an inadequacy complex of some sort going on
there nige. All this claiming to have done all manner of things
but unable or unwilling to contribute any real useful information
about them to others in search of it....

You either obviously don't know what you are bull****ting about or
even if you do you resolutely refuse to divulge any useful
information.

Q What are you doing on this group?
A Plainly & very simply - trolling

--
Jim K


----Android NewsGroup Reader----
http://usenet.sinaapp.com/

On Sunday, 20 November 2016 10:58:14 UTC, jim wrote:
tabbypurr Wrote in message:

His argument is that no matter what I say I must have never done it and not know what I'm talking about. No amount of explanation, pictures, stating the obvious or anything else results in him realising he's being an idiot. He plainly has some kind of problem. Fixed irrational beliefs are classic signs of mental illness, ditto having hatred of someone for no sensible reason. Perhaps that's it, who knows.


So no more info then? As I believe I predicted, it is a hallmark
of all your trolling "contributions" to this ng NoNowtNige.


I suspect you have an inadequacy complex of some sort going on
there nige. All this claiming to have done all manner of things
but unable or unwilling to contribute any real useful information
about them to others in search of it....

You either obviously don't know what you are bull****ting about or
even if you do you resolutely refuse to divulge any useful
information.

Q What are you doing on this group?
A Plainly & very simply - trolling

Since you're incapable of working out how to position a vacuum cleaner nozzle you are either mentally ill or retarded. Since you consider it my job to teach you such you are evidently the former. Since you also won't quit this idiocy you're also a troll. Welcome to the trolls & idiots bin. Bye.