I own one of those double ended boring bars which use HSS. Not really sure how they are suppose to be used. But guessing



  • The 90-degree end is for threading Operations
  • The 45-degree end is for turning operations
  • Most HSS bits are ground for standard threading operations.
  • Big advantage over inserts is reduced chatter. Inserts bear forces at the furthest point on the tool.





Is my understanding correct?

Thanks in advance, Tom
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