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Andyf04/06/2013 17:02:17
392 forum posts
Posted by JamesF on 04/06/2013 16:49:51:

Where does the spring loading come in? I can't work that one out.

James

My guess is that Nobby is avoiding the problem I have with my simple crank. If I forget it's there and turn the motor on, the imbalance makes the lathe try to do somersaults while the crank takes vicious swipes at my elbow. I guess Nobby's crank is loose on the shaft until pushed bodily inwards against a spring, to engage a dog clutch.

Andy

Russell Eberhardt04/06/2013 17:03:40
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2785 forum posts
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Posted by JamesF on 04/06/2013 16:43:17:

Not sure about imperial, but metric thread profiles are defined in terms of the pitch, aren't they? So if a 1mm pitch is required then any tap for a metric 1mm pitch thread will do the job?

That's right. 6 mm x 1mm is a common size. Perhaps a bit fragile though. You should be able to find 10 mm x 1 mm which has a bit more "meat".

Russell.

JamesF04/06/2013 17:09:22
29 forum posts

Ah, yes, eminently sensible to protect oneself from firing up the lathe with the handle still engaged

James

JasonB04/06/2013 17:13:02
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25215 forum posts
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Posted by JamesF on 04/06/2013 16:43:17:

So if a 1mm pitch is required then any tap for a metric 1mm pitch thread will do the job?

Its best to use a fairly close size otherwise the steeper helix angle of a small dia tap can start to rub if used for a very large diameter. I've used the method several times but never done more than about 1.5 times the tap dia. If I recal this was a 1/2" x 40tpi thread cut with a 3/8" tap

 

J

Edited By JasonB on 04/06/2013 17:15:58

Nobby04/06/2013 18:26:34
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587 forum posts
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HI James
You push the handle in and hold it in place when you turn the spindle . if you let go the spring pushes the handle out .IE if you let go it pops out safe. so you cant leave it in on its own . so if you switch the power on it wont spin round . Its similar the the handles on the Millwarkee and other milling machines
Nobby

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