Neumann lead screw info

[filtersweeper]

Hey guys, I had a track mastered and cut to 10" acetate this weekend and talking to the engineer he mentioned that his lead screw has some wear due to the years of continued use. I work as a machinist and may be able to either make a new one or source a shop that could provide this service for a replacement. Does anyone know of a drawing with information about this screw? It would be a better approach vs taking the machine apart and then reverse engineering it while it sits. Thanks again,

[Phinster]

have never seen info on neumann feed screws...if you're a machinist, it should be fairly simple to measure the pitch and angle...maybe!

[Aussie0zborn]

In don't there is a demand for replacement lead screws. First question is, how does he know it's worn? The only thing that makes contact with the leadscrew is the nylon half nut and they are likely to wear first. The half nuts have already been cloned and are readily available from our member Opcode66.

[dietrich10]

the bearing at the end of the lathe bed wears out normally. once replaced his lead screw should be good to go

[petermontg]

Is it a buttress thread?? Every rotation moves the carriage 1mm. So I gather you could work it out from there

[jtransition]

the bearing at the end of the lathe bed wears out normally. once replaced his lead screw should be good to go

Do you know the spec of these?
Thanks
J

[evildrome]

Be careful trying to make a leadscrew.

The originals are likely not cut but either rolled or rolled and ground.

In either case the threads will be lapped until identical to a master screw.

I don't know how Neumann did it but these master screws are typically kept in temperature controlled oil baths.

Cheers,

Wilson.

[evildrome]

Apparently its a 1mm pitch buttress thread. Not sure about the diameter.

Which makes sense. It only has to ever drive in one direction and the half nut engages and disengages easily with the sloping sides of the screw.

I did wonder how a normal acme half nut could be engaged without damage when a synchronizing mechanism is not used.

It's simply not necessary if your thread form only drives in one direction.

Cheers,

Wilson.