When turning a taper from the start of a shoulder there is a short(quarter inch?) Turn then a reduction of maybe .002 and the taper starts.

This is a turn on a shaft of maybe a few inches( 3 to 15).

The taper is to get a straight turn, due to wear in the machine. In some of the programs there will be 2 tapers in 15 inches to get a uniform turn.

I have in the past used sandpaper and a file to get rid of it, but it ain't right.

I hope I am explaining this right. It is a reduced diameter then at the start of the next diameter,there is a short straight before the taper starts.

Any guesses what is wrong.

Or a good book on programing a QS30 with Mazatrol?

If I understand you correctly, you may have a "Z LAG" problem!

>But then again, I 'm not quite sure of what your dilema is!

>>A picture is worth 1,000 words!! got one to post with the problem?

I will get my 12 year old nephew to show me how to post a picture this weekend.
Sorry 'bout that.

I have to look up "Z lag"

Rob

x-axis thrust bearings

That is something to bring into the mix!

thanks wippin' boy

yeah
there a whole bunch cheaper than a ball screw and
that and some gib adjustment work will tighten up any shall we say
"classic slant bed"