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  1. 30th August 2012, 06:25 PM #1
    Abratool
    Abratool is offline GOLD MEMBER
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    Default Crotch Centre for Hercus Lathe

    A little while back BT Bob & myself purchased a Crotch Centre each for our Hercus lathes.
    These little gadgets came in from the USA & we figured "they might come in handy one day."
    The concept of a crotch centres has been around for a long time, in essence a vee block ground into a Morse Taper that fits into the Lathe Tailstock. A simple accurate centreing device.
    Yesterday, rather than set up on a drill press in the conventional way, decided to give the crotch centre a test run on a small job.
    Two holes for tapped grub screws needed to be drilled on centre for a "Trammel Extender" .140" dia holes for 8-32 UNC
    The photo tells it all, however if I were using the crotch again a small toolmakers clamp to hold the workpiece would be recommended. rather than holding with fingers.
    regards
    Bruce
  2. 30th August 2012 06:25 PM # ADS
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  3. 30th August 2012, 07:50 PM #2
    welder
    welder is offline future machinist
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    Default

    Great another thing to add to the I want list. looks useful though
    BETTER TO HAVE TOOLS YOU DON'T NEED THAN TO NEED TOOLS YOU DON'T HAVE

    Andre
  4. 30th August 2012, 11:45 PM #3
    Stustoys
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    Certainly on my "might come in handy one day"
    Do you know if they are NOS or are they still around?

    Stuart
  5. 31st August 2012, 08:02 AM #4
    Michael G
    Michael G is offline Philomath in training
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    I'm pretty sure there was an MEW article on them a couple of years back. While you could buy one, given that it's a taper with a round V block on the end, making one should be reasonably easy.

    Michael
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