Re: [Killietalk] drilling plastic tanks

[LeeH920226 at aol_com]

I just drilled three more rigid plastic tanks.  Actually they are Lustar 2.5 
gallon tanks. I used the same jig I use to drill glass tanks that supports the 
plastic or glass on both sides. I tried with the Forstner bit with a 1/8 inch 
pilot hole and found that it works better without a water flow as lubricant. 
It needs to heat up a little to get a smooth hole. So, my technique that seems 
to be best was wet the hole but turn off the water. After about half way 
through I removed the plastic drill fragments and wet the hole again and continued 
until finished. The backing plastic plate has a 3/4 inch hole in it and I 
aligned that with the new hole when I checked it at the halfway point. Before 
that a 1/4 inch hole was aligned with it.

Lee Harper
Media PA
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