I don't want to spend much on the relay if in the end I replace the spindle motor and controller with something newer.
I did look at these as a possibility, using two side by side. A pair of them for $13 mxuteuk-JQX-13FL-Indicator-Electromagnetic
I was able to get the relay to work after repeated cleaning of the contacts. Still a bit sketchy but the lathe now runs in both direction and confirmed what the problem lies. If I keep the motor and controller I will replace the relays. I'll make a new post with questions about the original Lenze 530 speed controller and how to integrate it in to a new CNC controller.
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