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- Jun 7, 2013
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- 10,248
Normally, the die should "top" the thead; although filing the top is normal proceedure , especially with threads that are single point threaded in the lathe. Cutting threads in the lathe with button dies seldom results in a thread that is co axial with the axis of the part, very generally it will wobble. It is poor practice to thread in the lathe in this manner; at the very least, one can rough out the thread with a single point tool and finish with the die. I have always had availabe, die heads, such as Geometric or Hartness or J&L tangent dies for this sort of work; they cut an accurate thread without wobble or significant lead error that button dies create.