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Re: [APD] Re: Drilling tanks

If you're drilling down on a horizontal surface, you can
build a well around the area being drilled with modeling
clay to retain a small amount of water to keep the bit and
glass cool.

If drilling on a vertical surface, you can rig a bottle
with airline tubing to provide a steady but light stream of
water for cooling -- masking tape will hold it the
waterline in place over the drill area.

Bob, have you used these bits? Do you know how many
drillings are they good for?

Scott H.
--- BAshcraft at BrashearLP_com wrote:
> > Date: Tue, 09 Mar 2004 18:45:46 -0500
> > From: Bill Wichers <billw at waveform_net>
> Most LFS's that sell tanks will drill it for you. 
> Though, at $15-$20 per 
> hole, the cost will quickly surpass the cost of the
> diamond bit.  A 45mm 
> bit (1 3/4") is less than $40 from here
> http://www.khue.com/dept/grind/dbits.htm
> A 3/4" board with the appropriate size hole cut in it and
> clamped to the 
> glass works very well for a drilling jig.
> . . .  the recommended speed on
> a 45mm bit is 
> about 800 rpm.  Water can be used for coolant and it took
> 4 or 5 minutes 
> to drill a piece of 3/8" thick glass.  This includes
> stopping to add 
> coolant every 15-20 seconds.  The coolants purpose is
> ultimately to keep 
> the bit from overheating, but more importantly, to flush
> away glass 
> particle and keep the bit from clogging and causing the
> high heat.

> For one time use... maybe.  My bit paid for itself and
> still saved me $60 
> on the first tank.

S. Hieber

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