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Old 06-02-2019, 12:03 AM
Dave Lee's Avatar
Dave Lee Dave Lee is offline
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Default Temporary, Self Locking Stub Mandrel

As long as we're on the subject of mandrels and arbors, here's another one that I've actually made and used with success.

Turn a shoulder on a piece of round stock to a close, slip fit on the part you wish to mount on the mandrel.

Mill a flat on the diameter of the stub to the depth of a dowel pin's diameter or thickness, if that helps visualize it better.

Slip the part to be turned onto the stub and insert the dowel into the part on top of the flat.

Give your part to be turned, a slight rotation and it will lock up solid. The more it tries to spin, the tighter it will get.

Rotate the part in the opposite direction and it's free.

I didn't invent this, I got it from The Home Shop Machinist magazine back in the '80s.

The part I used it on was 1 inch thick steel about 6 inches in diameter with a 1 inch diameter hole in it. I used a standard 1/8"x 1" dowel pin.


Dave
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Old 06-02-2019, 02:19 AM
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LKeithR LKeithR is offline
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Quote:
Originally Posted by Dave Lee View Post
...Give your part to be turned, a slight rotation and it will lock up solid. The more it tries to spin, the tighter it will get.

Rotate the part in the opposite direction and it's free...
I assume you mean that when you rotate the part back to the centre point your part will be free. If you rotate the part past the centre in the opposite direction it will lock up that way too.

I learned that trick from an old machinist who I observed a lot during the late 60s and early 70s. It's really handy if you have a lot of parts to do because it's so quick. A quick turn to lock up, machine part and another quick turn in the opposite direction and the part is free. Rinse and repeat...
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Old 06-02-2019, 07:03 AM
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MetalWolf MetalWolf is offline
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Originally Posted by LKeithR View Post
Rinse and repeat...
So, Keith. What do you rinse it with each time.
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Old 06-02-2019, 07:45 AM
Lew Hartswick Lew Hartswick is offline
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Just a simplified version of the recoil rope lawnmower starter. :-) I suppose all you guys have tractors or battery powered lawnmowers and have forgotten such devices. :-)
...lew...
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