Who can make this lead screw for me?

Of course, ALL American (Imperial threads) lathe leadscrews are

8 TPI. If you had a 6 TPI leadscrew, you would be unable to cut almost any standard Imperial thread! Look at the standard threads, 6-32, 4-40, 1/4-20, etc. They are ALL based on factors of 4 and 8, and only by accident do factors of 3 and 6 show up. The only standard I can think of is 12-24.

I know people have gotten Acme allthread from McMaster-Carr and such sources, and cut a keyway if needed. The 10 and 12" Atlas machines use a 3/4" - 8 leadscrew. I've NEVER, EVER, seen a 6 TPI leadscrew in a lathe. (Many use 10 TPI crossfeed screws.)

Jon

The issue is, I can't find any 8 TPI Acme lead screw stock in the diameter of 7/8ths of an inch. Other diameters, yes, but not in THAT one, which is the one I need.

If you or anyone knows of a source for that, please let me know.

CJ

Contact Dave Sobel at:

Sobel Machinery

82 Herbert Ave. Closter, New Jersey Zip code 07624 Phone 201-768-9645

Or

Meridian Machinery at: Phone 610-656-0449 Mohnton,Pa. 19540

One of these to will have what you need from a donor machine.

Jim Vrzal Holiday,Fl.

Chris Johns> I'm in search of a replacement lead screw for a Clausing 6300 lathe that

Here's one for the " buy used American group"- come on guys where can he get a leadscrew for his machine for a reasonable price? If the leadscrew is that worn out what about the rest of the machine? At least he has a Chinese ( Smithy) unit and I'll bet he could get a leadscrew for it same day for a real low price.

"Chris Johnson" > I'm in search of a replacement lead screw for a Clausing

6300 lathe that

Jon, As Ed McMahon used to say, "You are WRONG, sir!" My Rivett (as American as it gets) 1020S has a 6TPI lead screw, and far from being "unable", it will cut 84 different threads, from 2 to 240 TPI. Dan

I have a brand new lead screw for an Atlas lathe. I'm sure its 8 TPI, but I think its 3/4. chuck

Are you telling me that my lathe can't cut 9tpi, 11tpi, 27tpi,

14 tpi, 13tpi, etc. etc... Because they are not multples of eight?!? The face plate seems to indicate that I can.

Even if you had an 11 or 14 tpi lead screw, you could still cut any thread you wanted to. _As long as_ the thread dial gear had the corresponding number of teeth.

Now, where the thread dial will re-align with the thread will matter depending on the relationship of the tpi of the lead screw and the thread being cut.

Since metric threads will have an irrational relationship to the lead screw, the half nuts cannot be disengaged. But, that is another facet of the same discussion...

Pete

Noll Incorporated

390 Buckley Road San Luis Obispo, CA 93401 805-543-3821

Lists a precision rolled acme screw, 7/8-8.

I made a replacement lead screw for a friend's Atlas, I think it was

3/4" dia though. I looked for the literature from the source for that screw but can't locate it. Green-something or other, they sell lots of rolled screw stock, bronze and cast iron nuts, and other interesting stuff. Used a keyseat cutter to machine the slot. Take your time deburring here. If you don't, you'll quickly shave what's left of your half nuts into oblivion...

Jon

here is a place - try google.com

Martin

Tsk tsk Jon, maybe somebody should have told LeBlond about that? The TPI of the leadscrew will affect the number of lines on the threading dial, not what threads it will cut, that's just a matter of gearing. And what about 11 or 13 tpi (or 5.75 and 11.5, for that matter)? They're all on my changebox and I have a 6tpi leadscrew on my LeBlond Regal.

And of course you can cut metric threads with an English leadscrew, although the threading dial won't work in that instance.

Paul