Dec 1, 2015 | TOOLING


We sharpen our CBN bits in our mill using our diamond coated carbide valve seat tip sharpener. We hold the CBNs in a 1/2” collet and turn the mills head parallel to the table, then set the carbide sharpener on the mill table. You aren’t applying any real pressure in this operation, so the sharpener will sit there while the sharpening is occurring. We run the mill at about 150 RPM and we use WD-40 to lube and cool the sharpener wheel while grinding. Since the CBNs are diamonds too, you will dull the wheel at an accelerated rate, but we have been doing this for about 7 years without replacing the wheel. It does take longer to sharpen them than it did originally, but wearing out a wheel in 7 years is OK with us.

Timm Jurincie
Tuf-Enuf Auto & Marine Performance
Avondale, AZ
December, 2015