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Thread: Lathe hand crank

  1. #1
    Supporting Member mklotz's Avatar
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    mklotz's Tools

    Lathe hand crank

    Nothing beats a spindle hand crank for sneaking a thread up to a shoulder or locking the spindle while removing a stubborn chuck.

    The aluminum cylinder is slip fit in the spindle bore. The cone nut, pulled in by the bolt, expands it like an expansion collet, and makes it grab the inside of the spindle. The crank arm is screwed to the expanding cylinder and has a rotating handle. It's especially long for lots of "command authority" torque.




    and here's what it looks like all put together.



    After these pictures were taken, an anti-rotation pin was added to the conical nut. Said pin rides in one of the expansion slots and prevents the cone-nut from turning as the bolt is torqued to expand the collet.
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    Last edited by mklotz; 07-08-2017 at 08:31 AM.
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  2. The Following 3 Users Say Thank You to mklotz For This Useful Post:

    kbalch (09-14-2015), nevadablue (09-14-2015), PJs (09-16-2015)

  3. #2
    kbalch's Avatar
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    500+ Homemade Tool Plans

    Thanks Marv! I've added your Lathe Hand Crank to our Lathe Accessories category, as well as to your builder page: mklotz's Homemade Tools. Your receipt:

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  4. #3
    nevadablue's Avatar
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    Thanks for another one Marv! I was thinking of making something like that, maybe using a moly bolt to start with. I need one for my indexed Unimat headstock.
    ---
    Ken

  5. #4
    Supporting Member mklotz's Avatar
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    Quote Originally Posted by nevadablue View Post
    Thanks for another one Marv! I was thinking of making something like that, maybe using a moly bolt to start with. I need one for my indexed Unimat headstock.
    IIRC the Unimat bore is only about 7 mm. A moly might work well for such a small bore.
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  6. #5
    nevadablue's Avatar
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    I can't find a small expansion bolt (I think I used the wrong term when I said 'moly' bolt) that isn't made of steel. I think I'll make a tiny version of your aluminum one Marv.
    ---
    Ken

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    Thanks for the great and simple gizmo, I just finished making one and it works beautifully.

  8. #7
    Supporting Member mklotz's Avatar
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    Quote Originally Posted by nevadablue View Post
    I can't find a small expansion bolt (I think I used the wrong term when I said 'moly' bolt) that isn't made of steel. I think I'll make a tiny version of your aluminum one Marv.
    I've heard "moly" used to include both toggle bolts and expansion bolts. I think both of us are thinking of the latter.

    There might be one problem with a moly. The "leaves" that expand when the bolt is tightened aren't at all springy and so may not retract when the bolt is loosened. You might need to use a bit of force to remove it.

    Given the constraints of the small Unimat spindle bore, you may want to think about a design where the expansion mechanism is outside the bore instead of inside. In the past I've made expanding arbors by drilling the end of a rod for a tapered pipe thread. After slitting, a tapered thread pipe plug screwed into the hole expands the leaves of the arbor. Some variant of that idea might allow the "expander" to be outside the bore.

    Whatever you do, I'm sure Unimat users everywhere (myself included) would love to see your solution. Put a description and pictures up here so we all can see it.
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  9. The Following User Says Thank You to mklotz For This Useful Post:

    PJs (09-16-2015)

  10. #8
    Supporting Member mklotz's Avatar
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    Quote Originally Posted by jkahn View Post
    Thanks for the great and simple gizmo, I just finished making one and it works beautifully.
    Thanks, jkahn. It's very satisfying to know that someone thought enough of the idea to make his own. I appreciate you letting us know that it worked for you. Perhaps you'll show us a picture of the finished item when you have a chance?


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