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Unread 10-03-2014, 17:55
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Greg Needel Greg Needel is offline
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FRC #2848 (All-sparks)
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Re: How to Make a Clean Hole with 1 1/8" Dill Bit?

I have had good luck with step drills and we use them quite often, specifically when just cleaning up holes cut on our cnc plasma.

A few years I found this http://www.mcmaster.com/#4080a26/=r1d6zv It works well if you are trying to drill a hole from nothing, I do recommend using a drill press for this, as it can still walk out like a regular hole saw, but the finish is much better.
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Greg Needel│www.robogreg.com
Co-founder REV Robotics LLC www.REVrobotics.com
2014 FRC World Champions with 254, 469, & 74