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Hi
There is a helpful guide to the repair and maintenance of the machines on the blurb website.
Google blurb.co.uk, then search maintenance guide Okuma. It is £15, but the info contained is very...

The contactors laminated metal core on the winding changeover units have a habit of breaking, this cause the contactor to fail to enegergise on occasion. Also check the coil, as these contactors have...