Quote:
Originally Posted by Secant
There are over 200 Greenlee chassis punches on ebay right now.
I'm sure I'm not the only one that uses drill rod as the center on hole saws. A good tight hole made with a stub drill makes for a more accurately sized bore cutting down on saw rim wander and reaming by the pilot drill.
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I can get good accuracy with hole saw diameters by using a hard pilot (non-cutting drill stem okay), just the right speed (VSR), and a good cutting lube.