Pete C. formulated the question :
"Pete C." wrote:

Wayne wrote:

A friend at work has a wine press which needs some help. The internal
threads of a piece that moves up and down on an acme thread are
damaged.
I've been unsuccesful at getting him to bring it so I can measure it.
Through other methods it appears to be 1.25 x 3 TPI (or possibly
M32 x 8.5). I haven't been able to find any sources for any acme
nuts of that size. The lowest the my lathe will go is to 4 TPI.
It will also do 6 or 9 TPI.
Is there anyway to fudge a 3 TPI?

Wayne D.

I suspect it may be metric since it seems that a lot of that type of
equipment comes from metric countries. If he won't bring it for proper
measurement, it can't be all that important to repair eh?

Can you change both pieces so you can use something like the 1.25x5 that
Enco carries? Convert to pneumatic or hydraulic?

Come to think of it, are you sure it isn't a dual/multi lead screw?

Could be metric since I think he said it came from the old country.
He does have another one, so maybe it isn't all that important for him
to get it fixed. All I hear is it's too heavy. A mill or lathe is
heavy.

I missed that Enco had acme rods/nuts. Mcmaster's prices would put a
repair at about half the cost of the unit. Enco's prices would be
feasible.

I didn't even know about multi lead screws until I researched
a mini acme rod for a small stepper motor. Wasn't an even number
of TPI. If you look on the end, do you see 2 starting points?
What's the purpose of them?

Wayne D.