Nc:
I have disassembled the whole machine. Ballscrew support bearings was removed because coolant and other muck was feeding though the support bearings and into the servo gear housing. Also if you look at the post that i have referred to earlier and you look at the photo you will also see why i had to take the ball nut apart.
http://www.cnczone.com/forums/showthread.php?t=23225
I had i look at the bearing preload grinding procedures and setups , but i am still in the dark as to why the orientation is so important (other for high point identification) in which case you would install the marks 180 degrees apart
If not, then they must have been tested while seated inside the machinetool and that does not sound practical either.
The machine was bought from a "reputable" machinetool dealer in Cape Town, but some monkey did a repair job on it, doing some real nasty stuff like replacing hardened taper pins with mildsteel round bar, leaving out bolts and seals and reassembling with cracked castings etc.
What i'm saying is that this is a 20 year old machine that has been compromised. I want to make it work so that it can start paying for itself again.
Your guidance would be much apreciated.
Pieter