FP2NC z axis shudder and fault when using rapids

[AlfaGTA]

To get to the clutch you will have to pull the servo motor.
First raise the “Z” slide about 2/3 full height.
Block the slide so it can’t move down by placing a block on the operators side between the vertical slide and the machine base.
Place the block on one side not on the front (there are limit switches front center of the vert casting for the “X” travels).
Use your hand wheel to ease the vertical into tension on the block. (Take the weight)

Remove the sheet metal cover on the non operator side of the machine base.
This covers the access window for the “Z” axis screw drive belt.

Unbolt the “Z” servo, remove all 4 bolts/washers.
Push the servo towards the “Z” screw. (Takes tension off drive belt)

Reach in through the badde access window and work the cog belt off the servo motor pulley
This is a dirty job! Swarf from the belt and used oil off the screw collect here.
Good time for some cleaning!

Pull the servo up and out. Should be able to leave the motor connected, the cables have some excess

The drive pulley is held to the servo shaft with a center Allen. Remove it,, likely tight has LocTite.
Pull the pulley off the shaft. (It will be tight).
The pulley Carrie’s the clutch.
The top of the clutch ic a threaded washer/ plate with a hole circle, and a screw. Remove the screw , advance the ring one hole replace the screw.

Cheers Ross

 

[rimcanyon]

Ross, you make it sound easy! Thanks as always for your help.

 

[AlfaGTA]

If you wish to disassemble,the clutch, carefully measure the original height of the adjusting ring(nut) and match mark the clocked position of the ring relative to the clutch body
Then unscrew the ring to release the springs and detent balls.
Clean and grease ,reassemble to measured height and clocked position.

Assembly is opposite the removal. Be sure to get the belt engaged with both pulleys.
Tension by prying between the servo body and the main machine casting, tighten the mounting bolts.
(Should be made to have the belt fairly tight)
Be sure that the protruding dowel in the machine side of the mounting flange is engaged in the slot (provides adjustment movement) in the servo base.
Be sure to remove the block before making any test moves!!!!!!!!
Cheers Ross