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Thread rolling device

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ksor:
-->bogstandard:

It was exactly a "divice" like that I had in mind - thanks !

But when I want to use it on the lathe ... I need to have the "spoke" in the chuck and then the tail stock with the "thread rolling device" had to be able to move towards the chuck as the thread is rolled on

OR do I misunderstand something ?

How is the "spoke" released when finished - I think there have to be some "click here to release" to remove the rollers from the spoke.

bogstandard:
Ksor,

You have to remember that the ones I have shown most probably came from the early part of the 20th century and made down to a price.

When you have finished rolling, you wind it back off again.

But as you can see from the pics, it does have a crude tightening device that works by a tapered thread having a threaded hand feed nut on it, so I suppose it could cater for varying sizes of spokes and also put pressure on over several runs to form the thread, the same sort of thing you do with a die.

I don't know whether it is intentional, but the rollers are loose on their angled spindles, in all directions, but the spindles don't look to be worn. Maybe it is to allow the rollers to settle into their own rolling pattern.

I would have tried them out, but I don't have any soft iron spokes, only the modern day stainless ones, which I think would be too hard a material to try to roll threads onto. Threads on modern day spokes are cut I think, not rolled.

You can gain a lot of information by just looking at pictures such as these. With a little speculation you can imagine what was going through the designers mind when he was faced with the problem in the first place.

It is your turn now.

Bogs

John Hill:
I imagine those rollers go in something not unlike a knurler as the process is pretty much the same.  Of course the device would have to move in accordance with the pitch of the thread being rolled.

ksor:
-->John Hill:
Yeah - just like knurling with a little more power - the movement because of the pitch of the thread can be managed just by loosening the tail stock so it can be dragged towards the chuck - just like CUTTING a thread with a die.

The hard one is to design the "click to release" - something like a ring around the rollers and when the ring is turned the rollers is moved away from the "spoke" and the tail stock can be removed

- but I have to think the design over a copple of times.

John Hill:
Ksor,  I think the company that makes a lot of these is Fette in Germany.

I do not know why the device would not be on the carriage then it could be moved in sympathy with the thread pitch being rolled.

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