My husband is trying to drill a 1/2 inch diamond tip through a glass
me and broke 3 so far. i made him get out of the basement
before he broke
anymore! I have read that water helps, with a clay
Is there anything he
should or shouldn't do? He is using his drill
press, going slow. Any other
suggestions? Help before he breaks them
A rotary hammer for glass...?
My first question would be what type of drill bit he's using. He needs
to use one of those arrowhead-tipped bits designed for glass, and yes,
the ring of putty creating a small pool of water will help cool the bit
and block and keep it from cracking due to thermal stress. You might
have to get creative cleaning out the inside of the block when you're
Another alternative is to have him bring the block to a stained glass
place - they'll probably drill the holes for $20 or so. Cheaper than
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A friend of mine drilled about 25 of those glass blocks last year. Just
a regular drill and used one of those arrow head drill bits made for
glass. She poured water over the glass block for cooling the bit.
She stuffed a small string of christmas lights inside the the glass
blocks. decorated them with ribbon and flowers.
Sold many for $20 a piece and gave some for christmas presents. They
really turned out beautiful.
I have a feeling this is what this lady it going to do.
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On 12/16/05 8:03 PM, in article
56Mof.165459$ firstname.lastname@example.org, "spunkster_1964"
carborundum or some similar abrasive. If the block is hollow, it might be
difficult getting the slurry into the right location. It would help to know
just what you are trying to do.
-- Ferme le Bush
Is he using a bit specially made for glass and or tile ???
Before he continues to break more blocks why not just take the block to
your local glass mirror supllier...they are in the yellow pages under
"glass" and have them drill it.
I had a large mirror drilled one time...4 holes in the corners and it
was only 6.00
Your husband should be using a pipe bit that has two slots, the putty or
clay ring is supposed to hold graphite powder and a drop of water for
cooling and cutting. The graphite is supposed to do the cutting not the bit.
Tell hubby if he owns a dremel tool he can buy a glass etching bit for it
that will cut a hole but he needs to take his time.
I missed the size of hole you were drilling. My other post answered
the typical question about drilling a more typical smaller hole in
glass or tile - sorry 'bout that!
Here's some more specific information from a place that sells abrasive
diamond hole saws:
Go to a glass shop and buy the correct drill bit. You "might" be able to
buy one at Home Depot.
Just did a quick search, looks like Lowes carries them so this would
mean that HD also has them.
Scroll down a bit (no pun intended ; ) and you will see a pic of a bit
made for glass.
The correct bit is shaped like an "arrowhead" on the end. (there are
other types of bits for glass but they are VERY expensive - they are for
Using a damn of clay or putty with water and even a little anti-freeze
mixed in is the correct way to drill the holes. But START drilling the
hole DRY just so you will have a small (size of a BB) pilot spot to keep
the drill bit steady and straight.
I would recommend using a variable speed hand drill, not a drill press.
Tell your husband to drill VERY slowly applying VERY light pressure.
Ron - 25 yrs in the glass business
What is the advantage of using a hand drill (I'm assuming you mean
cordless or electric)? The drill press has a table which allows the
block to be clamped in place, controls the speed very accurately, and
gives far greater control over advancing the bit and pressure.
I was assuming that "his" drill press doesn't have variable
speed......All of the ones that I've used (which isn't many) only have
one or two speeds.
If he uses a variable speed hand drill (electric or cordless) he will
have more control over the pressure and speed.
It's very easy to apply too much pressure with a drill press especially
when drilling glass.
If you've done it a million times like I have, then a drill press is
I'm just trying to help the guy not break anymore blocks.
And there is really no need to clamp a glass block, best just to lay it
on a flat surface with a piece of carpet under it.
On Sat, 17 Dec 2005 04:03:13 GMT, email@example.com (spunkster_1964)
I've drilled a number of glass blocks with no problems.
Used a 1/2" diameter diamond core drill bit ($19).
Drill press (actually a milling machine) at very slow speed.
Water for coolant. Note that the water & ground glass will be sucked
inside of the block when the bit breaks through due to the vacuum
Details at: http://www.kissingfrogs.tv/blocklights.html
Steve Noll | The Glass Block Pond
My mother-in-law just completed this craft project. Drilled holes in glass
blocks, inserted mini Christmas lights and decorated the outside. They look
nice and she's giving them away to friends for Christmas. She bought a
diamond drill bit at Home Depot. I think it was $12. To my knowledge, she
did not use a slurry, etc. She did indicate that she needed to go very
slow. He drill was somewhat underpowered for the job (a Black & Decker
cordless). She made about 10 or so of these things with no breakage that I
am aware of.
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