Almost sounds like an emergency stop function. What's not adding up was fact it was working. Leaning my machine when I first got it, I felt like I was chasing rabbits. But after inspecting and cleaning my limit switches to start with. I had a running machine......for a bit. Then I had to clean the contacts on all my push buttons. Then I had to replace the spindle drive motor cooling fan. Works great now. Older machines = corrosion. Sometimes just a good ole fashioned cleaning does wonders.
Good luck
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