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The machine is all back together and now has another controller, it seems this was defiantly the issue and appears that on the change of direction from a + move to a - move it was loosing steps. At...

@skrubol It looks like you were on to something, I machined a new gib from Acetal just to ensure that there was very little resistance. that did not solve the problem.
Then removed the ball nut...

I am using a 4 axis board with the TB6560 chip's. It has been working well for years and just to be sure that there was not a fault in the Z i swapped the motor over to the A axis only to get the...

This problem is going to drive me to drink.. Mmmmm Beer!!!

While doing complex engraving/relief cuts the Z axis will slowly cut deeper and deeper. I checked the ball screw and there is minimal...

Great news...!! i repacked the ball nut with 3.175mm chrome steel balls, added what appeared to be 2 missing balls in accordance to the Thompson manual and its working a treat.
Now the backlash is...

Well, that is something not to be amused about!!!
So I replaces both Z axis shaft bearings and just for a near future upgrade ordered a couple of thrust bearings in as loading two normal bearings on...

I will strip them down again, I did check them and they seemed OK but I an now starting to wonder if this is not the issue due to what appears to be a slight inconsistency in the backlash.

I...

Lol, Yes and No, I have replaced the original spindle and upgraded the bearings, IIRCC the original bearings were only rated at about 6K RPM, the ones I installed were some time back were rated from...

Years ago I purchased a conversion kit for the Seig SX2 from cncfusion, installed it and made a few alterations as the kit out of the box had a few issues. Once these were sorted the machine has...