Enlarging a round hole
 

Hi All,
I'm fitting an extractor fan in our kitchen and have a little problem
with the hole it will extract through. To make the hole I hired a diamond
core cutting tool from HSS and used the largest bit about 6". Having bought
the extractor and sleeve the hole needs to be slightly bigger to accommodate
the sleeve. Any advise on how I can neatly increase the size of the hole.
For example is there such a drill bit that effetely files the brick away.

In hindsight I should have bought the sleeve first and measured it rather
than relying on the 6" quoted on the front of the extractor packaging.

Thanks
Martin.

Enlarging a round hole
 

On Sun, 6 Nov 2005 08:37:42 -0000, "Martin"
wrote:

Hi All,
I'm fitting an extractor fan in our kitchen and have a little problem
with the hole it will extract through. To make the hole I hired a diamond
core cutting tool from HSS and used the largest bit about 6". Having bought
the extractor and sleeve the hole needs to be slightly bigger to accommodate
the sleeve. Any advise on how I can neatly increase the size of the hole.
For example is there such a drill bit that effetely files the brick away.

In hindsight I should have bought the sleeve first and measured it rather
than relying on the 6" quoted on the front of the extractor packaging.

Thanks
Martin.


Faced with this problem some years ago, I bodged the sleev to a
smaller size :-(

Rick

Enlarging a round hole
 

Martin wrote:

I'm fitting an extractor fan in our kitchen and have a little problem
with the hole it will extract through. To make the hole I hired a diamond
core cutting tool from HSS and used the largest bit about 6". Having bought
the extractor and sleeve the hole needs to be slightly bigger to accommodate
the sleeve. Any advise on how I can neatly increase the size of the hole.
For example is there such a drill bit that effetely files the brick away.

Use a scutch chisel with hammer, to gently and neatly nibble away the
required brickwork. Wonderful tools.

David

draw aroung the ducting on the wall where its going then, Drill several little holes, close together with a SDS drill or rotary hammer then use a small brick chisel on the spaces between the holes.

Enlarging a round hole
 

In an earlier contribution to this discussion,
Lobster wrote:

Martin wrote:

I'm fitting an extractor fan in our kitchen and have a little
problem with the hole it will extract through. To make the hole I
hired a diamond core cutting tool from HSS and used the largest bit
about 6". Having bought the extractor and sleeve the hole needs to
be slightly bigger to accommodate the sleeve. Any advise on how I
can neatly increase the size of the hole. For example is there such
a drill bit that effetely files the brick away.

Use a scutch chisel with hammer, to gently and neatly nibble away the
required brickwork. Wonderful tools.

David

It's amazing what you learn here! In my 45 years of DIY, I'd never heard of
a scutch chisel until today!

Is the idea that, with its serrated end, it will dig in and allow small
quantities of material to be removed in a controllable fashion - whereas a
plain chisel would glance off?
--
Cheers,
Set Square
______
Please reply to newsgroup. Reply address is invalid.

Enlarging a round hole
 

Great Thanks.

I have an SDS drill with hammer only mode can you get a scutch chisel for an
SDS?

Martin

"Lobster" wrote in message
...
Martin wrote:

I'm fitting an extractor fan in our kitchen and have a little
problem
with the hole it will extract through. To make the hole I hired a
diamond
core cutting tool from HSS and used the largest bit about 6". Having
bought
the extractor and sleeve the hole needs to be slightly bigger to
accommodate
the sleeve. Any advise on how I can neatly increase the size of the
hole.
For example is there such a drill bit that effetely files the brick
away.

Use a scutch chisel with hammer, to gently and neatly nibble away the
required brickwork. Wonderful tools.

David

Enlarging a round hole
 

Lobster wrote:
Martin wrote:

I'm fitting an extractor fan in our kitchen and have a little problem
with the hole it will extract through. To make the hole I hired a diamond
core cutting tool from HSS and used the largest bit about 6". Having bought
the extractor and sleeve the hole needs to be slightly bigger to accommodate
the sleeve. Any advise on how I can neatly increase the size of the hole.
For example is there such a drill bit that effetely files the brick away.

(Effetely? Absolutely nothing more brutal than a nail-file, dear.)

Use a scutch chisel with hammer, to gently and neatly nibble away the
required brickwork. Wonderful tools.

If you have an SDS drill, a toothed chisel would probably do it - though
it's obviously less gentle than a hand tool. In the longer term, it will
also be useful for chasing slots, sinking boxes and removing whole
bricks.


--
Ian White

Enlarging a round hole
 

Martin wrote:
I have an SDS drill with hammer only mode can you get a scutch chisel for an
SDS?

Nah, don't think so: the whole point of using a scutch chisel is it's
for pretty delicate, almost fine-tuning work; sticking one in an SDS
machine would be self-defeating.

David

Enlarging a round hole
 

Set Square wrote:

It's amazing what you learn here! In my 45 years of DIY, I'd never heard of
a scutch chisel until today!

Is the idea that, with its serrated end, it will dig in and allow small
quantities of material to be removed in a controllable fashion - whereas a
plain chisel would glance off?

Exactly that. I'd never heard of them either till quite recently; it
was a joiner watching my efforts at forming a doorway in a brick wall
who put me onto them. The combs themselves are disposable and fit in
either chisels or directly into hammers; personally I prefer the chisels.

David

Enlarging a round hole
 

Lobster wrote:

Nah, don't think so: the whole point of using a scutch chisel is it's
for pretty delicate, almost fine-tuning work; sticking one in an SDS
machine would be self-defeating.

Depends on your SDS... with a very the good speed control on my one I
can be far more delicate with that, than with a lump hammer!

--
Cheers,

John.

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Enlarging a round hole
 

vonryan wrote:


draw aroung the ducting on the wall where its going then, Drill several
little holes, close together with a SDS drill or rotary hammer then use
a small brick chisel on the spaces between the holes.

Vonryan, change your name to Osmium, it's far more appropriate.

--

Enlarging a round hole
 

"Martin" wrote in message
...
Great Thanks.

I have an SDS drill with hammer only mode can you get a scutch chisel for
an
SDS?

Martin

You want one of these you do ;-)

http://www.screwfix.com/app/sfd/cat/...07833&id=13029

Enlarging a round hole
 

YTC449 wrote:

"Martin" wrote in message
...
Great Thanks.

I have an SDS drill with hammer only mode can you get a scutch chisel for
an
SDS?

Martin

You want one of these you do ;-)

http://www.screwfix.com/app/sfd/cat/...07833&id=13029

I got one of those diagonal-ended TCT chisels on the recommendation of a
local electrician, only to find out that what had actually been
recommending was a square-ended one (still with 3-4 TC teeth).

Comparing the two, they would be about the same for removing bricks and
chasing slots, but the square chisel is definitely much better for box
sinking because it's very easy to make flat-bottomed cuts. At a guess,
the square one would probably be better for this particular job as well.


--
Ian White