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Thread: Screw cutting by hand

  1. #1
    Supporting Member thehomeengineer's Avatar
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    Nov 2017
    Berkshire UK
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    Screw cutting by hand

    Hi All

    Being a modelmaker there is always a need to screw-cut fine threads and these can be fiddly underpower of the lathe especially up to a shoulder.. To overcome this, cutting by hand gives me a little more control and feel while cutting the thread.

    The lathe gear train is set to cut the required TPI or pitch, the leadscrew can then be engaged. In the back of the chuck spindle a crank handle is locked to to place to rotate the chuck/collet.

    The photos below show the set up for cutting a piece of 3/16" phosphor bronze 5" long 3/16x40TPI. To support the bar a rotating centre in conjunction with a travelling steady was used. The crank handle is then rotated by hand and with the saddle engage onto the leadscrew to cut the thread in the normal way.

    The lathe spindle drive belt is also disconnected for two reasons. Firstly to make the rotation of the spindle easier and secondly to prevent myself from starting the lathe and having the crank handle spin around dangerously.

    Screw cutting by hand-gear-train.jpgGear train to cut 40TPI

    Screw cutting by hand-spindle-handle.jpgSpindle handle. This is a commercially made handle by Myford.

    Screw cutting by hand-steady-centre.jpgCentre and travelling steady supporting the 3/16" diameter bar being cut

    Many thanks
    The Home Engineer

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  2. The Following 5 Users Say Thank You to thehomeengineer For This Useful Post:

    asterix (Mar 28, 2021), Drew1966 (Mar 27, 2021), Home-PC (Mar 29, 2021), Jon (Mar 26, 2021), nova_robotics (Mar 26, 2021)

  3. #2
    Supporting Member Toolmaker51's Avatar
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    Feb 2016
    Midwest USA
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    Toolmaker51's Tools
    Never cut such fine threads this would occur, but certainly hand spun to get large radii on parts with form tools.
    ...we'll learn more by wandering than searching...

  4. The Following User Says Thank You to Toolmaker51 For This Useful Post:

    thehomeengineer (Mar 26, 2021)

  5. #3
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    Thanks thehomeengineer! We've added your Manual Screw Cutting Method to our Machining category,
    as well as to your builder page: thehomeengineer's Homemade Tools. Your receipt:

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