Dial Indicator & Boring Bars from Shars

harrzack said:
mikey - I contacted Shars about that, and as expected the 'carbide' is a typo. I'm still not sure if they are ground correctly though...
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Thank you for looking into that. If that is an M42 set then the price is very nice for an 8% cobalt set of bars. You can grind them with a bench grinder or belt sander and hone them with a diamond stone. I like these bars in a boring head but they also work well on the lathe, provided we keep in mind their extension limitations.

If you plan to use them on the lathe, consider grinding a 5 degree lead on them - this reduces tangential forces and also shifts cutting forces toward axial for improved accuracy. The positive lead also allows you to cut cleanly in a closed bottom bore compared to a zero lead bar - less rubbing and chatter.
 
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