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Gingery Lathe Mods

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chipenter:
My Faircut lathe had a replacement spindle 1 1\4" dia with a mt3 taper and bored to 3\4" , chatter was always a problem and I bent it on a dig in , made a new one mt2 bored to 5\8" mutch better , my SouthBend has mt3 and bored to 3\4 and is 1 3\4" , at 1" I would leave it solid may be make a seperate collet spindle as well .

vtsteam:

--- Quote from: awemawson on February 08, 2015, 03:02:16 AM ---Off the wall thought Steve ... Could you make the spindle large  enough to cut the Vee pulley shape in the rear end?

--- End quote ---

YGood thought. You might be able to Andrew, and I actually thought about that before the poly-vee idea, but the disadvantages I realized are that I would have to machine the small pulleys and their sheaves for each of my spindles. And the spindles would no longer slide through the bearings for changing them. I'd have to remove the bearing caps because the sheaves would be bigger than the bore.  Right now I just loosen the cone set screw and the collar at the back of the headstoc setscrew and slide the whole spindle out to change.

vtsteam:
Eugene, maybe, I'm not sure about end float. On as simple a lathe as this, there is just a bronze washer type thrust bearing on the nose end, and the collar with a setscrew at the back of the spindle to keep things in place. You just push in the spindle and lock the back collar by pressing it tightly against the headstock. In other words, It's all done by hand, and you eliminate play by holding things tight while tightening.

vtsteam:
Chipenter, that's a definite concern, then. I do really want a hollow spindle this time around, but it doesn't have to be 3/4" if that seems too much.

This would also argue for the 1-1/4" spindle nose vs. 1" throughout.

MT2 would be okay, and I have MT2 collets already for the old Atlas hrizontal mill (I think they're MT2 -- have to check), so MT3 wouldn't be a necessity.

vtsteam:
Further thoughts:

3/4" U.S. water pipe is about .822" ID and 1.050" OD.
1"    U.S. water  pipe is about 1.045" ID and 1.315" OD

So if I brazed a short bit of 1" pipe over an arbor of 3/4" pipe, I could turn the nose section 1.25" OD and probably just ream out the rear bushing to suit whatever the 1.050 aft spindle O.D. becomes when trued.

This would give me a wall thickness of about .214" at the front bearing and a .822 bore. throughout.

If worrisome at that (or to suit my MT2 taper tooling) I could always plug the nose end, and bore smaller, if desired. But I don't think it will be a problem.  This is a 7" lathe without backgear, and driven by a 1/4 hp motor. If I bend a spindle, I'll just make a stronger one.

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