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pntrbl
11-22-2007, 10:31 AM
I'm looking at a chuck on E-Bay that the seller claims has a 2 3/16 x 10 tpi mount. That's an unusual spindle thread in my limited experience, but if it exists I'm sure someone here will know about it.:)

Seems more likely to me it's a 2 1/4 x 8 tpi that the seller isn't capable of measuring correctly ....

SP

Ken_Shea
11-22-2007, 10:41 AM
My limited experience with several spindle threads were all non standard threading.

Ken

IOWOLF
11-22-2007, 10:47 AM
Look up the tolerances on those large threads You May find it is close to 1/16 of an inch.

Stepside
11-22-2007, 10:51 AM
I have one that is 1-1/4 by 7. This is a standard pitch for a 1-1/4 bolt. I would ask the seller if he measured it with a pitch gauge or a yard stick.

rkepler
11-22-2007, 11:01 AM
That's a Hardinge spindle thread, shows up on their lathes, dividing heads and indexers. It might have been used on some other lathe but I don't recall seeing it.

pntrbl
11-22-2007, 11:10 AM
Looks like rkepler nailed it. The chuck is described as a Hardinge. Better not buy that one! LOL! You guys saved me again ....

SP

wierdscience
11-22-2007, 12:13 PM
Having owned and ran quite a few lathes of different makes and year models I can say for sure that no spindle thread suprises me,buyer beware.

The further you go back in history towards 1850 the more lathe mafgs there seem to be.At one time every mom and pop foundry and machineworks it seems made lathes ad none of them used any real standard.

And my personal fav was an old woodlathe that used 1-3/8-6 butress:rolleyes:

DR
11-22-2007, 01:08 PM
That's a Hardinge spindle thread, shows up on their lathes, dividing heads and indexers. It might have been used on some other lathe but I don't recall seeing it.

Yep, Hardinge.

Some of the Hardinge indexers used this thread, some used the Hardinge tapered nose, others were plain nose (no thread).

The el cheapo clones of the Hardinge indexers with threaded noses are copied in every respect except the threads. They use a more common 2-1/4 x 8 thread.