HAAS TL2 Spindle head adjustments

[warrant914A]

I have a TLS and noticed while cutting threads the other day it was cutting deeper on on side of the material than the other. I used a test bar and dial indicator and found there was a .004 differnece from one side of the stock to the other. Can anyone tell me how to adjust the spindle head so that my parts will turn on center again. I tried to contact HAAS but they told me I would have to buy a service manaul if I wanted to do it myself.

[Geof]

What do you mean by 'spindle head'? Are you referring to the chuck?

Also what do you mean by: how to adjust the spindle head so that my parts will turn on center again. ?

Do you mean that the parts used to run true but now they do not run true?

Have you taken the spindle head (chuck?) off and then replaced it?

Until you can explain what you want in terms people can understand you might not get much information.

[warrant914A]

It is an 8" three jaw self centering chuck so I didnt think the chuck would be the cuase of the parts turning "off center." I am not sure what the correct termanology is for this problem. When you put a piece of round stock in the chuck and use a dial indicator, there is a .0004 difference where the dial indicator touches off from on side of the round stock to the other. I am trying to get the parts to turn true again but not sure how to make adjustments to compensate for the difference.

[KenFoulks]

Indicate the chuck, see if it is misaligned or broken.

[Geof]

.... there is a .0004 difference where the dial indicator touches off from on side of the round stock to the other. ...

In your first post you said 0.004" difference; which is it, 0.004" or 0.0004"?

0.0004" is quite good for a self-centering chuck unless it is an expensive high precision one, or a Set-Tru type that can be dialed in.

0.004" is not very good. Dial the chuck body as Ken suggests. Check that the jaws are in the correct slots in the correct order. Try different diameter stock and see if the runout is the same. Make sure the jaws are not marked where they grip the stock. Finally take the chuck off, make sure everything is spotlessly clean on the mounting taper and remount it.

If you cannot get it any better than 0.004" after all this you are stuck without, there is no way to adjust it.