Thread: Left Hand Threading . . . . .
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David Billington David Billington is offline
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Default Left Hand Threading . . . . .
wrote:
K. H. Moltrecht in his book Machine Shop Practice advises: " . . .
The left-hand side-cutting tool should have a 10- to 17-degree relief
angle on the flank below the right side-cutting edge, and an 8- to
12-degree relief angle below the left-hand cutting edge. . . . ".

Can someone please explain why the 2 respective relief angles should
not be the same ?

Bob Swinney
To take into account the helix angle of the thread.
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