Fadal VMC4020A axis problem

[cwww]

The inside of my motor looks like this, which is a little bit different from the pic in the maintenance manual. I wonder if I need to remove the black cover or not, in order to rotate the resolver. BTW do all these things meant to be done when the power is still on? Seems that there're quite some cables around the resolver...

[motomitch1]

If you can't turn the resolver ,cold start vmc,loosin the coupler were it connects to the ball screw or servo motor. You may have to pre loosin the coupler so it can be rotated to were you can get at the screws and then turn the ball screw till your cold start lines - lines up. while the servo is on and in proper position and since you loosin both screws up on the coupler you should be able to spin the coupler around were you can get at the screws and tighten them up. There could be some safety issues but thats how I would do it. I would just be real carefull.

[motomitch1]

That looks like the newer ac servo my work has older Fadals with dc motors

[cwww]

Anyway, I think my motor is bad, cos since I swapped the one for y-axis with the one for z-axis, my z-axis started to have problems...

[hardmill]

Have you tried just swapping the encoder only and not the
whole motor?
Just a thought.

PEACE