Roll form thread die wheel question...

[niggle]

I was at work today (Apprenticing toolmaker), cutting a thread on a lathe, the boss comes up to me with a roll form thread die wheel and a small brass part with a thread that's been made with the die wheel. The die wheel is multistart (4 starts), but the part is only single start.

He wants me to tell him how / why a 4-start die wheel can produce a single start part. I have absolutley no idea!

Does anyone know how this is? I've had a bit of a look on google but google doesn't know much about roll form thread die wheels

He said they made die for a special thread for a job they were doing. It's OD is about 40.45mm and the part is approx 11mm. (almost 4x.. this relates to the 4-start thread?)



I anyone's intersested.. I work here www.tpenz.com


Thanks, Nigel.