Is this how to remove the X axis motor?

[Jackal66]

I have Hurco KM3P with Electrocraft servos. Y & Z axis have belts & pulleys from the motors to the ball screws.

The X axis is direct drive. There is a strange coupling attaching the motor to the ball screw.

Do I just remove the set screw that I have marked in the picture?



Then remove the (4) bolts attaching the motor adapter to the table?



This is where the coupling is located in case anyone was wondering.



My guess is that it is set-up for misalignment & probably absorbs vibration and shock to keep from transmitting problems to the ball screw bearings.

I Just want to make sure that this isn't one of those things, that when you undo it , springs & stuff fly everywhere.

Thanks in advance,

JAckal

[Al_The_Man]

Look like a heavy duty disc coupling, usually they are keyed on and then a set screw is used to pin into place.
If it proves difficult, usually the four bolts can be removed, but it is a fiddle.
Watch out for any washers or spacers on the bolts.
Al.

[bloke]

There are two set screws on the coupling. There should be another 90 degrees round. One is against a Woodruff key that may tip as it's tightened so loosen them a long way.

[Jackal66]

Thanks Al & bloke,

It is exactly as you guys described it.

Here are some pics in case someone in the future is searching for this info.
( Sorry for the blurry pics. When I brought my camera out into the hot shop, the lens started fogging up)



This is the coupling on the motor. (It looks more like a garbage disposal)



These are the shims that connect the parts together. I am guessing (3) parts. The hub on the motor, ballscrew hub, and center coupling. The pieces identified by red arrows are the connector plates.Up inside the machine, they looked like sold plates about .070 thou. thick ( less than 2 mm).

After getting it out they are a stack of lamination/shims . There are probably around (10) shims in each stack. This could be to allow some flexing for misalignment. Working on the same principle of multiple leaf springs on a car.



This is the end I removed the set screws from. Just as bloke & Al said.



The setscrews on the motor side were recessed far enough into the motor mount housing that I couldn't access them. If someone has to remove the connector bolts holding the coupling together this may help.

To the other experienced guys on here, this is everyday stuff.


JAckal

[Al_The_Man]

This is the coupling on the motor. (It looks more like a garbage disposal)
These are the shims that connect the parts together. I am guessing (3) parts. The hub on the motor, ballscrew hub, and center coupling. The pieces identified by red arrows are the connector plates.Up inside the machine, they looked like sold plates about .070 thou. thick ( less than 2 mm).

They are a version of what is known as a zero backlash disc coupling.
Al.