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[APD] Re: Drilling tanks
> Date: Tue, 09 Mar 2004 18:45:46 -0500
> From: Bill Wichers <billw at waveform_net>
> For most people who only need a few holes drilled it is going to be
> and safer (from the tank's perspective :-) to have the holes drilled at
> glass shop.
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
>You really need a diamond coring bit and a drill press or
> drilling jig that can keep the bit steady to ensure good results.
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 diamond coring bits are usually run at relatively low speed for a
> period of time to drill the hole, and are usually used with a liquid
> coolant/lubricant to keep the bit from seizing or overheating.
That depends on your definition of "low speed" and "longish period of
time". If I remember correctly, 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.
>The equipment is too expensive for occasional DIY use.
For one time use... maybe. My bit paid for itself and still saved me $60
on the first tank.
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