I have a concealed cistern behind MDF, which has been tiled.

I am fitting a new flush valve in place of the old syphon. It's mostly
done, but I need to recess the button. That needs a 40mm hole through
the tiles and MDF, in place of the existing rather ragged 30-35mm hole.

What's the best way of doing that? 40mm drill will tend to wander. I
have a 1/2" belt sander, but that'll take ages. Any suggestions please?

On 26/09/2019 14:22, GB wrote:
I have a concealed cistern behind MDF, which has been tiled.

I am fitting a new flush valve in place of the old syphon. It's mostly
done, but I need to recess the button. That needs a 40mm hole through
the tiles and MDF, in place of the existing rather ragged 30-35mm hole.

What's the best way of doing that? 40mm drill will tend to wander. I
have a 1/2" belt sander, but that'll take ages. Any suggestions please?

Do you mean you are trying to enlarge the ragged hole, or are you
starting again with a new tile.

On 26/09/2019 14:22, GB wrote:
I have a concealed cistern behind MDF, which has been tiled.

I am fitting a new flush valve in place of the old syphon. It's mostly
done, but I need to recess the button. That needs a 40mm hole through
the tiles and MDF, in place of the existing rather ragged 30-35mm hole.

What's the best way of doing that? 40mm drill will tend to wander. I
have a 1/2" belt sander, but that'll take ages. Any suggestions please?

https://www.permagrit.com/small-rotary-tools/

These willl take down tiles as well as MDF
(wear a mask)

Or

https://www.permagrit.com/radius-ext...e-file-coarse/

Permagrit tools are ruddy brilliant actually



--
I would rather have questions that cannot be answered...
....than to have answers that cannot be questioned

Richard Feynman

On 26/09/2019 14:45, The Natural Philosopher wrote:
On 26/09/2019 14:22, GB wrote:
I have a concealed cistern behind MDF, which has been tiled.

I am fitting a new flush valve in place of the old syphon. It's mostly
done, but I need to recess the button. That needs a 40mm hole through
the tiles and MDF, in place of the existing rather ragged 30-35mm hole.

What's the best way of doing that? 40mm drill will tend to wander. I
have a 1/2" belt sander, but that'll take ages. Any suggestions please?

https://www.permagrit.com/small-rotary-tools/

These willl take down tiles as well as MDF
(wear a mask)

Or

https://www.permagrit.com/radius-ext...e-file-coarse/

Permagrit tools are ruddy brilliant actually




I've ordered one of these:
https://www.amazon.co.uk/dp/B00VSZ1F...740111_TE_item

For under £2 it's worth a go. As long as it does this one hole, that's
good enough.

Apparently, the technique to use is either to make a 40mm hole in some
timber to use as a guide, or to start the drill at an angle, to make a
groove to hold it in place.

On 26/09/2019 14:59, GB wrote:
On 26/09/2019 14:45, The Natural Philosopher wrote:
On 26/09/2019 14:22, GB wrote:
I have a concealed cistern behind MDF, which has been tiled.

I am fitting a new flush valve in place of the old syphon. It's
mostly done, but I need to recess the button. That needs a 40mm hole
through the tiles and MDF, in place of the existing rather ragged
30-35mm hole.

What's the best way of doing that? 40mm drill will tend to wander. I
have a 1/2" belt sander, but that'll take ages. Any suggestions please?

https://www.permagrit.com/small-rotary-tools/

These willl take down tiles as well as MDF
(wear a mask)

Or

https://www.permagrit.com/radius-ext...e-file-coarse/

Permagrit tools are ruddy brilliant actually




I've ordered one of these:
https://www.amazon.co.uk/dp/B00VSZ1F...740111_TE_item

For under £2 it's worth a go. As long as it does this one hole, that's
good enough.

Apparently, the technique to use is either to make a 40mm hole in some
timber to use as a guide, or to start the drill at an angle, to make a
groove to hold it in place.


WOW!

I was looking for that...yes that is way better.

Agree with both techniques .



--
"Anyone who believes that the laws of physics are mere social
conventions is invited to try transgressing those conventions from the
windows of my apartment. (I live on the twenty-first floor.) "

Alan Sokal

Do you have any of the original tiles left?
Brian

--
----- --
This newsgroup posting comes to you directly from...
The Sofa of Brian Gaff...

Blind user, so no pictures please
Note this Signature is meaningless.!
"GB" wrote in message
...
I have a concealed cistern behind MDF, which has been tiled.

I am fitting a new flush valve in place of the old syphon. It's mostly
done, but I need to recess the button. That needs a 40mm hole through the
tiles and MDF, in place of the existing rather ragged 30-35mm hole.

What's the best way of doing that? 40mm drill will tend to wander. I have
a 1/2" belt sander, but that'll take ages. Any suggestions please?

On 26/09/2019 16:50, Brian Gaff wrote:
Do you have any of the original tiles left?
Brian


Probably. Hopefully, I won't need to search.

On 26/09/2019 14:22, GB wrote:
I have a concealed cistern behind MDF, which has been tiled.

I am fitting a new flush valve in place of the old syphon. It's mostly
done, but I need to recess the button. That needs a 40mm hole through
the tiles and MDF, in place of the existing rather ragged 30-35mm hole.

What's the best way of doing that? 40mm drill will tend to wander. I
have a 1/2" belt sander, but that'll take ages. Any suggestions please?


Fix a bit of wood across the existing hole so you have a centre.
Just glue it to the back of the MDF with No More Nails etc.

Mark the centre and drill your new hole with a diamond core drill.

On 26/09/2019 14:59, GB wrote:
On 26/09/2019 14:45, The Natural Philosopher wrote:
On 26/09/2019 14:22, GB wrote:
I have a concealed cistern behind MDF, which has been tiled.

I am fitting a new flush valve in place of the old syphon. It's
mostly done, but I need to recess the button. That needs a 40mm hole
through the tiles and MDF, in place of the existing rather ragged
30-35mm hole.

What's the best way of doing that? 40mm drill will tend to wander. I
have a 1/2" belt sander, but that'll take ages. Any suggestions please?

https://www.permagrit.com/small-rotary-tools/

These willl take down tiles as well as MDF
(wear a mask)

Or

https://www.permagrit.com/radius-ext...e-file-coarse/

Permagrit tools are ruddy brilliant actually




I've ordered one of these:
https://www.amazon.co.uk/dp/B00VSZ1F...740111_TE_item

For under £2 it's worth a go. As long as it does this one hole, that's
good enough.

Apparently, the technique to use is either to make a 40mm hole in some
timber to use as a guide, or to start the drill at an angle, to make a
groove to hold it in place.

Just watch that the mdf doesn't burn as it will get hot tying to drill
it with that.

A rotary tool and a drum sander might be better after you reach the mdf.

"GB" wrote in message
...
I have a concealed cistern behind MDF, which has been tiled.

I am fitting a new flush valve in place of the old syphon. It's mostly
done, but I need to recess the button. That needs a 40mm hole through the
tiles and MDF, in place of the existing rather ragged 30-35mm hole.

What's the best way of doing that? 40mm drill will tend to wander. I have
a 1/2" belt sander, but that'll take ages. Any suggestions please?

Shouldnt be hard to fasten some scrap behind the
existing hole so that the 40mm drill doesnt wander.

On Fri, 27 Sep 2019 10:50:41 +1000, cantankerous trolling geezer Rodent
Speed, the auto-contradicting senile sociopath, blabbered, again:


Shouldn¢t be

Oh, ****! And at least this little thread was Rodent-free, so far! tsk

--
Bod addressing abnormal senile quarreller Rot:
"Do you practice arguing with yourself in an empty room?"
MID:

+1 for the use a 40mm template, worked well for me core drilling a hole where the core drill was longer than the pilot drill.

Richard

Tricky Dicky Wrote in message:
+1 for the use a 40mm template, worked well for me core drilling a hole where the core drill was longer than the pilot drill.

Richard


Not much piloting there then!
--
Jim K


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

See for yourself Jim

https://www.screwfix.com/p/erbauer-d...bit-28mm/94375

Richard

On 26/09/2019 14:45, The Natural Philosopher wrote:
On 26/09/2019 14:22, GB wrote:
I have a concealed cistern behind MDF, which has been tiled.

I am fitting a new flush valve in place of the old syphon. It's mostly
done, but I need to recess the button. That needs a 40mm hole through
the tiles and MDF, in place of the existing rather ragged 30-35mm hole.

What's the best way of doing that? 40mm drill will tend to wander. I
have a 1/2" belt sander, but that'll take ages. Any suggestions please?

https://www.permagrit.com/small-rotary-tools/

These willl take down tiles as well as MDF
(wear a mask)

Or

https://www.permagrit.com/radius-ext...e-file-coarse/

Permagrit tools are ruddy brilliant actually



Useful link, not come across permagrit. I was going to say that for
enlarging a ragged hole I'd probably use an abrasive tool in a Dremel or
similar, noting that the cheap ones that typically come with them are
often single use.

On 26/09/2019 14:59, GB wrote:


I've ordered one of these:
https://www.amazon.co.uk/dp/B00VSZ1F...740111_TE_item

For under £2 it's worth a go. As long as it does this one hole, that's
good enough.


That seems too good to be true to me. I've tried a few cheap diamond
tools (e.g. Dremel sized cutting disks) and usually been disappointed.

In article ,
GB wrote:
I have a concealed cistern behind MDF, which has been tiled.

I am fitting a new flush valve in place of the old syphon. It's mostly
done, but I need to recess the button. That needs a 40mm hole through
the tiles and MDF, in place of the existing rather ragged 30-35mm hole.

What's the best way of doing that? 40mm drill will tend to wander. I
have a 1/2" belt sander, but that'll take ages. Any suggestions please?

Make a nice wooden trim etc to cover the hole edges?

--
*If a turtle doesn't have a shell, is he homeless or naked?

Dave Plowman London SW
To e-mail, change noise into sound.

On 27/09/2019 10:32, Tricky Dicky wrote:
See for yourself Jim

https://www.screwfix.com/p/erbauer-d...bit-28mm/94375

Richard


you could buy the long pilot drill.

wood block is cheaper.

On Friday, 27 September 2019 12:46:19 UTC+1, newshound wrote:
On 26/09/2019 14:59, GB wrote:


I've ordered one of these:
https://www.amazon.co.uk/dp/B00VSZ1F...740111_TE_item

For under £2 it's worth a go. As long as it does this one hole, that's
good enough.


That seems too good to be true to me. I've tried a few cheap diamond
tools (e.g. Dremel sized cutting disks) and usually been disappointed.

it might have a single piece of microscopic diamond grit on it. If you're lucky it hasn't fallen off already. Use the TCT version, diamond is pointless at best.


NT

On 27/09/19 17:32, wrote:
On Friday, 27 September 2019 12:46:19 UTC+1, newshound wrote:
On 26/09/2019 14:59, GB wrote:


I've ordered one of these:
https://www.amazon.co.uk/dp/B00VSZ1F...740111_TE_item

For under £2 it's worth a go. As long as it does this one hole, that's
good enough.


That seems too good to be true to me. I've tried a few cheap diamond
tools (e.g. Dremel sized cutting disks) and usually been disappointed.

it might have a single piece of microscopic diamond grit on it. If you're lucky it hasn't fallen off already. Use the TCT version, diamond is pointless at best.

Decent diamond-coated tools are not cheap, and work well provided you
don't push them too much and get them too hot. TCT is ok for most
things, but will be at its limit with vitrified porcelain tiles (I don't
think that the OP has stated what the tile material is).
https://www.protrade.co.uk/blog/how-to-drill-porcelain-tiles/
https://www.screwfix.com/p/erbauer-diamond-tile-drill-bit-6-x-67mm/51908

--

Jeff

On 27/09/2019 18:46, Jeff Layman wrote:
On 27/09/19 17:32, wrote:
On Friday, 27 September 2019 12:46:19 UTC+1, newshoundÂ* wrote:
On 26/09/2019 14:59, GB wrote:


I've ordered one of these:
https://www.amazon.co.uk/dp/B00VSZ1F...740111_TE_item

For under £2 it's worth a go. As long as it does this one hole, that's
good enough.


That seems too good to be true to me. I've tried a few cheap diamond
tools (e.g. Dremel sized cutting disks) and usually been disappointed.

it might have a single piece of microscopic diamond grit on it. If
you're lucky it hasn't fallen off already. Use the TCT version,
diamond is pointless at best.

Decent diamond-coated tools are not cheap, and work well provided you
don't push them too much and get them too hot. TCT is ok for most
things, but will be at its limit with vitrified porcelain tiles (I don't
think that the OP has stated what the tile material is).
https://www.protrade.co.uk/blog/how-to-drill-porcelain-tiles/
https://www.screwfix.com/p/erbauer-diamond-tile-drill-bit-6-x-67mm/51908

I have had great sucess with cheap diamind coated tools. They work
excelllently for half a dozen holes, then the diamond wears off and
thats it.

But that is all you normally need.


--
€œIdeas are inherently conservative. They yield not to the attack of
other ideas but to the massive onslaught of circumstance"

- John K Galbraith

On Saturday, 28 September 2019 08:46:34 UTC+1, The Natural Philosopher wrote:
On 27/09/2019 18:46, Jeff Layman wrote:
On 27/09/19 17:32, tabbypurr wrote:
On Friday, 27 September 2019 12:46:19 UTC+1, newshoundÂ* wrote:
On 26/09/2019 14:59, GB wrote:


I've ordered one of these:
https://www.amazon.co.uk/dp/B00VSZ1F...740111_TE_item

For under £2 it's worth a go. As long as it does this one hole, that's
good enough.


That seems too good to be true to me. I've tried a few cheap diamond
tools (e.g. Dremel sized cutting disks) and usually been disappointed..

it might have a single piece of microscopic diamond grit on it. If
you're lucky it hasn't fallen off already. Use the TCT version,
diamond is pointless at best.

Decent diamond-coated tools are not cheap, and work well provided you
don't push them too much and get them too hot. TCT is ok for most
things, but will be at its limit with vitrified porcelain tiles (I don't
think that the OP has stated what the tile material is).
https://www.protrade.co.uk/blog/how-to-drill-porcelain-tiles/
https://www.screwfix.com/p/erbauer-diamond-tile-drill-bit-6-x-67mm/51908

I have had great sucess with cheap diamind coated tools. They work
excelllently for half a dozen holes, then the diamond wears off and
thats it.

But that is all you normally need.

TCT is cheaper, just as effective unless you're drilling something of very exceptional hardness, and lasts


NT