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Old 04-16-2015, 03:59 PM
Gary Campbell's Avatar
Gary Campbell Gary Campbell is offline
CAMaster friend
Join Date: Dec 2012
Location: Marquette, MI USA
Posts: 2,854

I suggest that you use a 1/4" single O flute bit on an inside profile toolpath with spiral (.030" pass depth) strategy and machine these holes. Feeds XYZ=30ipm, rpm 13500. Your material, bits and machine will thank you.

You can see the process here, albeit on much thicker material:
Gary Campbell
CNC Technology and Training
The Ultimate Woodworking Machine

"There are 10 kinds of people in the world. Those that understand binary logic, and those who don't"
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