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Turns out to simply be a gummed up proximity switch - if I had looked at the diagnostic screen when the machine was homing I would have seen that the switch wasn't disengaging all the...

Thanks for the tips. I have had a look a parameters 507, 8 & 9 and they are all zero. Checked this in both diagnostic parameters and the main ones (didn't know which to check so checked both!)
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Tried that several times already. Unfortunately it has made no difference. Any other ideas?

1990 Denford TRIAC VMC running Fanuc OM-C control.

All was working fine until one afternoon getting her to home on the Y axis was temperamental but after a few attempts she did home after which...