lathe question for ya'll...

vinny · 2010-08-20T10:46:42+00:00

Yesterday I was hardcutting stainless on the new lathe, holding extreme tolerances. What I ended up with was the diameters were insanely perfect, thru 45 pieces (3hrs), the lathe held +-.0001 on a diameter no problem. But the Z wasn't so good. It was strange, the spread from shoulder to shoulder was changing. An example is a shoulder 1.5" from the front. It floated +-.0002. That's strange because the front shoulder repeated on location to within a tenth all day. Same conditions on all the shoulders, taking approx .005/side off. No insert wear whatsoever, im using coated cbn inserts and these things do not wear ever. Everything is real rigid.Now, my question is are lathe's more accurate in X due to maybe the spindle bearings? The Z axis is pushing on the bearings strait in? Is what I'm getting normal?Variable: Our lathe chuck is fuxored up, samsung is coming out today. With a gage pin clamped in previously bored steel jaws, boring .3 deep, the gage pin in the chuck all the way to the cut so it's almost clamped on the whole length of the jaws. 250 whatever clamping pressure. I bore and without unclamping it I get .0002-.0003 tir.That should be zero, I never unclamped the chuck? Plus it bounced my indicator a tenth or two. Then unclamp and clamp on that gage pin again and it goes anywhere from .0007 - .002 tir, and each jaw is different. So, maybe this crappy chuck is effecting my accuracy in Z????Any advice on this matter would be appreciated.

Aug 20, 2010 21 Replies

Rate this thread:

Joe788 15 years ago

.com...

You'll run into serious problems when you tell Mastercam to select all of those .1875 holes, and it only selects the .1875 holes and not the .

1873 holes. Just wait and see. You'll be back here ranting and raving with a pizza & literature filled briefcase in no time! LOL!

Vote

vinny 15 years ago

You'll run into serious problems when you tell Mastercam to select all of those .1875 holes, and it only selects the .1875 holes and not the .

1873 holes. Just wait and see. You'll be back here ranting and raving with a pizza & literature filled briefcase in no time! LOL! ******** Yah, his whole circle mask argument was ridiculous. He could of picked the hole as a sample, or typed in a tolerance or a range, sheesh I could go on forever.

Vote

Join the Discussion

Have something to add? Share your thoughts — no account required.

Didn't find your answer?

Ask the community — no account required