Looking for 7/8" - 4 acme threaded rod

[bloomautomatic]

I want to repair and old Ridge Tool vise. the lead screw is 7/8" diameter, 4 threads per inch, looks like Acme thread. I can't find that size and thread count as a standard acme size anywhere.

Am I out of luck on this? I suppose I could size it for one that is available and change the nut, but i'd rather not.

I need about 1' of it.

thanks

 

[beege]

Looks like the standard is 7/8"-6. Could it be a buttress thread?

 

[bloomautomatic]

Could be. I'll take a closer look. It's definitely not 6tpi. It measures at 4tpi.

 

[Zeuserdoo]

Do you have access to a lathe? You could possibly turn it yourself.

 

[mmarquette]

There is a place up around Wisconsin that makes and stocks odd acme rod . Can’t recall name . Think it started with green

 

[Dan from Oakland]

Horspool & Romine Mfg. Co., Inc.
5850 Marshall St

Oakland, CA 94608

Phone: (510) 652-1844

 

[Cole2534]

7/8-4, albeit LH, is the crossfeed screw pitch on my Monarch. I had 0 luck in finding 7/8-4 stock, LH or RH, in pursuit of a new lead screw, nut as well. I ended up cutting my own from 1144sp.

Beware the helix angle, IIRC, I used something like 15deg relief on the leading edge.

Programmed via Mazatrol

 

[gbent]

Its Green Bay Manufacturing. In Green Bay's line get 4 pitch you have to go to 1" diameter.

I've bought replacement threaded rod for cross slide lead screws from them before. Great service and product.

 

[bloomautomatic]

Do you have access to a lathe? You could possibly turn it yourself.

I do, and I could, but I'd rather just buy a piece if it's available.

 

[casaid1]

I want to repair and old Ridge Tool vise. the lead screw is 7/8" diameter, 4 threads per inch, looks like Acme thread. I can't find that size and thread count as a standard acme size anywhere.

Am I out of luck on this? I suppose I could size it for one that is available and change the nut, but i'd rather not.

I need about 1' of it.

thanks

What ever happened to this? I need the same thread but I need the nut. I have the 7/8-4 lead screw.

 

[casaid1]

I do, and I could, but I'd rather just buy a piece if it's available.

You wanna sell me the nut?

 

[Cole2534]

What ever happened to this? I need the same thread but I need the nut. I have the 7/8-4 lead screw.

I made my own nut, and to do that I made my own tap. Looking back I could have singled pointed it.

 

[casaid1]

I made my own nut, and to do that I made my own tap. Looking back I could have singled pointed it.

Could you make me a nut? Ill pay you.

 

[Cole2534]

Could you make me a nut? Ill pay you.

Shoot me an email with a drawing and I'll price it.

 

[casaid1]

Shoot me an email with a drawing and I'll price it.

I pretty much just need a 2-1/2" wide x 2-1/2" tall x 2-1/2" thick flat bar with 7/8-4tpi square thread taped through the center.

I can get it from there.

 

[Cole2534]

I pretty much just need a 2-1/2" wide x 2-1/2" tall x 2-1/2" thick flat bar with 7/8-4tpi square thread taped through the center.

I can get it from there.

OK, well shoot me an email with a drawing (and a material) and I'll quote it.

 

[James H Clark]

Are you sure about the acme thread, I have seen a lot of vises that are a square thread.
JH

 

[casaid1]

Are you sure about the acme thread, I have seen a lot of vises that are a square thread.
JH

The "ridge tool company" Simplex Cpn 43 bench vise does indeed have 7/8-4Tpi RH square thread.

 

[dalmatiangirl61]

Is there a reason NOT to use acme thread in a vise?

 

[casaid1]

Is there a reason NOT to use acme thread in a vise?

While I'm no expert, I wouldn't say its for any reason other than the square thread would take the horrizontal linear load the vise puts on it from tightening alot better. A more meat is better approach id assume.