Re: [Killietalk] (drilling tanks)

[Wright Huntley <whuntley at verizon_net>]

A few useful tricks:

Slow the drill down. Larger diameter holes need lower RPM as it is the 
surface speed that counts. Too fast just skids or hydroplanes without 
grinding much.

Check for stress areas by looking at the region to be drilled between 
two crossed polarizers. Stress areas show up as rainbow patterns instead 
of solid black. Tempered glass (do not drill) has a rectangular pattern 
of colors, usually.

I like a thick piece of glass as backing, and even wax the two together 
if I want a really clean exit hole. [That's hard to do to a tank without 
damaging the plastic rim with the heat used to melt harder waxes.]

As others have advised, keep pressure low but steady. Don't try to rush it.

Wright

--
Wright Huntley - Rt. 001 Box K36, Bishop CA 93514 - whuntley at verizon_net
                     760 872-3995

"I cannot undertake to lay my finger on that article of the Constitution which granted a right to Congress of expending, on objects of benevolence, the money of their constituents...." --James Madison

              http://www.libertarianism.com/


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