Lathe Tail Stock

Discussion in 'Horological Tools' started by Wayne C. Anderson, Oct 30, 2016.

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  1. Wayne C. Anderson

    Wayne C. Anderson Registered User
    NAWCC Member

    Dec 20, 2001
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    Can anyone identify this tail stock? Its marked "PAT'D OCT, 12, 1909" and on the underside marked "531". Thanks

    IMG_2941_1.jpg
     
  2. NC Plumber

    NC Plumber Registered User

    Jan 15, 2011
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    I was just reading that American Watch Tool Co lathe tail stocks had a patent date of OCT, 12, 1909. Not sure if that's what you have or if it's just a coincidence .
     
  3. L. Vanice

    L. Vanice Registered User
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    Apr 6, 2015
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    Retired mechanical engineer
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    That is the last American Watch Tool Co. WW tailstock design. It was introduced a couple of years before F. Derbyshire left AWT to start his own company. Soon after, AWT was liquidated and Derbyshire took over the watch lathe part of the business. The short time it was in production caused this tailstock to be uncommon these days.

    The long sleeve is pressed into the main casting. The sleeve has saw cuts in the center to make it flex. The knurled wheel has an internal cam that causes a steel pin to squeeze the center of the sleeve and lock the ram.

    The previous tailstock ram lock, Patented Oct 8, 1889, used a threaded screw with a lever handle to tighten a split portion of the left end of the cast iron sleeve. It is common to find the end of the sleeve broken, which is likely the reason for the redesign.

    Derbyshire designed a different lock for his own company's tailstocks. Again, the sleeve has a flex section. The lock is a screw with a pointed end and knurled disc, later a lever handle, that is in a diagonal tapped hole that enters the right end of the main casting. The pointed end applies pressure to the split part of the sleeve. Derbyshire used that design for many decades, so it must be counted a success.
     
  4. Ticktinker

    Ticktinker Registered User
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    Jul 7, 2015
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    It looks similar to something I have.
     

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