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Old 04-16-2015, 04:59 PM
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Gary Campbell Gary Campbell is online now
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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: https://www.youtube.com/watch?v=_38rxqSn0yk
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Gary Campbell
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