Neumann lead screw info

This is where record cutters raise questions about cutting, and trade wisdom and experiment results. We love Scully, Neumann, Presto, & Rek-O-Kut lathes and Wilcox-Gay Recordios (among others). We are excited by the various modern pro and semi-pro systems, too, in production and development. We use strange, extinct disc-based dictation machines. And other stuff, too.

Moderators: piaptk, tragwag, Steve E., Aussie0zborn

Post Reply
User avatar
filtersweeper
Posts: 38
Joined: Fri Feb 05, 2010 6:41 pm
Location: Canada
Contact:

Neumann lead screw info

Post: # 51952Unread post filtersweeper
Sat Dec 22, 2018 10:57 am

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,

User avatar
Phinster
Posts: 168
Joined: Mon Dec 22, 2008 8:47 am

Re: Neumann lead screw info

Post: # 51953Unread post Phinster
Sun Dec 23, 2018 8:22 am

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
Posts: 1838
Joined: Sat Mar 11, 2006 8:23 am
Location: Australia
Contact:

Re: Neumann lead screw info

Post: # 51954Unread post Aussie0zborn
Sun Dec 23, 2018 1:49 pm

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.

User avatar
dietrich10
Posts: 844
Joined: Wed Jan 16, 2008 2:18 pm
Location: usa
Contact:

Re: Neumann lead screw info

Post: # 51958Unread post dietrich10
Mon Dec 24, 2018 10:03 am

the bearing at the end of the lathe bed wears out normally. once replaced his lead screw should be good to go
cutting lacquers-vms70 system

User avatar
petermontg
Posts: 611
Joined: Sat Jun 26, 2010 7:51 am
Location: Ireland.

Re: Neumann lead screw info

Post: # 52332Unread post petermontg
Sun Feb 10, 2019 2:42 pm

Is it a buttress thread?? Every rotation moves the carriage 1mm. So I gather you could work it out from there
Peter Montgomery
+353(0)894926271
peter(at)petermontgomerymastering.com

Stereo cutter head wanted. Send email or smoke signals.

User avatar
jtransition
Posts: 85
Joined: Fri Apr 18, 2008 7:39 am
Location: Saarf London

Re: Neumann lead screw info

Post: # 52367Unread post jtransition
Thu Feb 14, 2019 12:02 pm

dietrich10 wrote: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

User avatar
evildrome
Posts: 62
Joined: Wed Jun 21, 2017 6:55 am

Re: Neumann lead screw info

Post: # 52586Unread post evildrome
Thu Mar 14, 2019 11:15 am

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.

User avatar
evildrome
Posts: 62
Joined: Wed Jun 21, 2017 6:55 am

Re: Neumann lead screw info

Post: # 52588Unread post evildrome
Thu Mar 14, 2019 12:24 pm

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.
You do not have the required permissions to view the files attached to this post.

Post Reply