Quote:
Originally Posted by jimbob200521
Slowest speed? Thought metal wanted speed?
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There is a thing called "surface footage". You need to match the cutting tool diameter with the material you are cutting to figure out the correct rpm.
Instead of the formula I use at work, here's a chart of surface footage for materials
http://img.photobucket.com/albums/v7...1.jpg~original
Match the surface footage to the drill diameter
http://img.photobucket.com/albums/v7...9.jpg~original