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  1. #1
    Paul Jones's Avatar
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    Rotating handle for Unimat lathe tailstock

    In July 2014 I wrote an article about making replacement rotating handles for the 3" swing Unimat SL 1000 lathe cross feed and carriage feed (Rotating handles for lathe cross slide and carriage control) but I never built a replacement handle for the tailstock. This article is about making the handle for the tailstock in the same design and manner as previously posted at HMT.

    Rotating handle for Unimat lathe tailstock-unimat-sl-1000-new-tailstock-swivel-handle.jpg Rotating handle for Unimat lathe tailstock-unimat-sl-1000-original-tailstock-handle.jpg Name:  Unimat SL before and after handle improvement.jpg
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    The difference is the tailstock handle machining was performed on a 12" swing geared head lathe rather than using the Unimat. The Unimat could have easily performed the machining with its swivel head capability for machining the 2 degree tapers as I did before. Instead I used a very accurate CNC ER32 collet chuck rated with 0.0001" TIR that can be held in the 6-Jaw chuck for this operation (see Tool Tips and Tricks about this Easy way to hold small diameter rods in a 3-Jaw or 6-Jaw chuck ).

    The reason I didn't use the Unimat is becasue I just didn't want to re-align the Unimat swiveling headstock after the machining because I have the headstock perfectly aligned (see HMT article Unimat SL Lathe Headstock Alignment ). The small lathe could have been used for the machining.

    After setting the 12" swing lathe compound to a 2 degree angle, the handle taper was machined from 1/2" dia. 2011-T3 aluminum rod. Next drilling the tapered-handle part way down with a 15/64" drill (later using the same drill diameter for the total depth for final reaming with a 0.250" reamer). Drilling only part-way allowed keeping the small and already tapered part to remain rigid in the chuck for boring a 0.300" X 0.500" deep opening. The opening fits a modified 3/4" X 10-32 stainless steel socket shoulder screw with a 0.250" dia. shoulder (actually measured at 0.247" dia. and why I am using the exact 0.250" reamer instead of of a 0.001" undersized reamer to provide enough room for rotation and no binding over time). The order of operations can be changed but this worked okay.

    Rotating handle for Unimat lathe tailstock-boring-0.300-inch-x-0.500-deep-hole.jpg Rotating handle for Unimat lathe tailstock-reaming-0.250-inch-through-hole-handle.jpg Rotating handle for Unimat lathe tailstock-parting-off-completed-handle-ready-install.jpg

    The next step was modifying the 3/4" X 10-32 stainless steel socket shoulder screw with an actual 0.247" dia. shoulder. The socket head diameter was reduced to 0.295" to allow an easy sliding fit inside the handle's 0.300 bored ID opening.

    Rotating handle for Unimat lathe tailstock-modified-shoulder-bolt-handle.jpg

    Next the original Unimat handle riveted-end was drilled-out and removed. The larger round handle was drilled and tapped for a 10-32 screw.

    Finally the shoulder bolt threaded-end was shortened by 0.10" so it would not protrude from the back of the larger wheel handle and then lubricated with Hoppe's No. 9 lubricating oil, and attached to the round handle.

    All the operations could have been performed with the 3" swing Unimat as I did the same operations previously for the other two handles.

    Thank you for looking,

    If you are interested in more of the 3" swing Unimat lathe modification projects please visit the articles at Modifications and Improvements to a Unimat SL 1000 Lathe .

    Paul Jones
    Last edited by Paul Jones; 03-28-2018 at 08:30 PM.

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

    jjr2001 (03-26-2018), Jon (03-25-2018), LMMasterMariner (03-26-2018), PJs (03-27-2018), Seedtick (03-26-2018)

  3. #2
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    Thanks Paul Jones! We've added your Lathe Tailstock Handle to our Lathe Accessories category,
    as well as to your builder page: Paul Jones's Homemade Tools. Your receipt:





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