Haas Drive Motor/Encoder

[Karl@CP PISTONS]

Hey all hass users. We just had to change our third

z axis drive moter/encoder assembly in 1 yr. Any body else have this problem. Or know of a place that can replace/repair the encoder end? $1145 for the entire part from haas. Machine cuts alum all day. I have been told that the brushless moters are very reliable.

Karl beyond belief

[Finecut]

Year of machine?

What did the motor do before going down?

Sounds like a power supply problem, but...

bearing to tight? lack of oil? any unusual sounds?

ck the drive control. If the drive is out of phase to the other drives. 3d work will show this, but not always.

The Haas service should be checking for all of this.

3 motors in a year is nuts!!!!

 

 

finecut

[Quickmike]

Try checking the counter balance also.

[Karl@CP PISTONS]

Machine DOB is 1999.

Motor does not do anything extraordinary(sp) just alarm out.

Haas repairman changed mocon board no change / Also took power supply for working machine / changed drive amplifier. I filled the counterbalance myself less than 6 months ago.

 

What would show us if the drive is out of phase?

 

Haas replaced motor/encoder first time, Then problem returned I replaced motor/encoder. Now problem returns again.

 

Thanks for the ideas

Any one else?

Karl

[RickG]

Did the repairman look at the ball screw bearings while he was in there. If the screw is pulling too hard then the motor takes all the load of moving the head up regardless of the counter weight.

You can check it yourself if you want.

 

1. E-stop the machine with the head about 12 inches from the table.

2. this will expose the "Z-axis" screw behind the column.

3. Jump up on the table and give the screw a turn by hand. (WITH E-STOP ON) make sure that lights flahing when you put your hand inside.

4. what your looking/feeling for is a grinding when the head moves up or down. but it should move EASY either way.

 

HTH

Rick

[TonyL]

We went through alot of encoder belts on our VF-1. We noticed the problem when tapping the most.

[RickG]

so what was the result?

Did you get any answers?

I would like to know how it turns out since we have several Haas machines here.

Thanks

Rick