Thread rolling device

[Ned Ludd]

Hi Guys,
Thread rolling may be used in industry to create threads but they are also used in the garage end of the business to restore slightly knackered threads. Many years ago we had some hand held thread restoring rollers in common motorcycle thread pitches. They were much kinder to parts, that were stripped or burred, by swageing a thread rather than cutting some metal away as you would with a die.
Ned

[John Swift]

Hi
a long time ago I watched a Danobat 50 automatic  capstan machine roll a 25mm thread at an amazing speed
the rollers retracted at the end of the thread as the spindle didn't stop

I've found a picture of the type of roller head

it may give you ideas