[revlimit]

Hello everyone. I 'm working on a Haas VF-6. Lately after powering up the machine it has lost its Y location. Today it was about .475 off and was similarly off the day before. I can re-dial in to the reference hole and it will make perfect parts all day. If I power it down then back up though, I'm sure it will be off again. Does anyone have an idea what this problem is? It has a brand new servo amp on this axis by the way. Thanks for any help you may provide!!

[TXFred]

Metal chips on the Y axis home switch or switch actuator?

Frederic

[haastec]

If you have the roller type switch, it is most likely sticky. If you have a proxy switch, it could be chips as previously mentioned.

Another thing to check would be any slop in the y-axis ball screw. Perhaps one of the locking nuts has worked loose. Do you have any backlash?

If it is holding accuracy though, my money would be on the switch.

[Bryan33]

haastec you are right on the money. follow what he told you and you will be fixed

[revlimit]

Thanks everyone. I guess I was fooled since, in the past, when a chip has been on the prox sensor after startup, the machine throws a "servo error too large" alarm. This time it didn't. I'm machining an access hole into the way cover after I pull them back. The covers and seals are in perfect condition but we're still getting chip intrusion. Thanks again guys and I'll check-in with an update.