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Thread: Threading setup chart

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    mklotz mklotz's Avatar
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    Aug 2015
    LA, CA, USA
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    Threading setup chart

    Threading to a shoulder, external or internal, on a lathe can be a tricky operation. Many times, threading away from the shoulder makes things easier. Puzzling out the correct setup can be tricky. I did it once, covering all the possibilities, and put together this chart so I would never have to think about it again.

    Perhaps some of you might find it useful...

    A - Threading tool upright, point toward lathe back
    B - Threading tool inverted, point toward lathe back
    C - Threading tool upright, point toward lathe front
    D - Threading tool inverted, point toward lathe front

    L - Direction of feed = Left
    R - Direction of feed = Right
    f - Forward Spindle Rotation
    r - Reverse Spindle Rotation

    To Cut Right Hand External Threads: Lf(A/D) Rr(B/C)
    To Cut Left Hand External Threads: Lr(B/C) Rf(A/D)
    To Cut Right Hand Internal Threads: Lf(B/C) Rr(A/D)
    To Cut Left Hand Internal Threads: Lr(A/D) Rf(B/C)

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  2. The Following 4 Users Say Thank You to mklotz For This Useful Post:

    Carlos B (03-23-2017), Paul Jones (10-19-2016), PJs (10-05-2016), Toolmaker51 (02-19-2017)

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