forstner bit on plastics?

[Stytooner]

The specialty bits attempt to keep acrylic from cracking after being drilled.
The little acrylic I have used has had mixed results with those bits.
I don't see any cracking worth mentioning in polycarbonate. When it does, it is thinner stuff and the bit caught and pulled or jerked through.

[leehljp]

I will add that for me, Forstners did fine with lexan but other plastics/acrylics did not always do as well. Lexan was like cutting hard butter, and I got ribbons; But plastics/acrylics varied from rough to cracking. On most plastics/acrylics, I used a hole saw.

[cabinetman]

I will add that for me, Forstners did fine with lexan but other plastics/acrylics did not always do as well. Lexan was like cutting hard butter, and I got ribbons; But plastics/acrylics varied from rough to cracking. On most plastics/acrylics, I used a hole saw.

I've also used hole saws with acceptable results, Although I use the same methods, I can feel the difference between machining cast acrylic, extruded acrylic, and polycarbonate. What's a real PITA, is machining 1¼" bullet rated material. I had a few bank projects to do teller windows and drive through enclosures.

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