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Help with x axis noise on older lathe

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So I have isolated the noise, which is a low volume thump but it is consistent with the revolution of the servo while jogging. This servo and x axis assembly has obviously been messed with in the past, it looks thrown back together.

It is hard to hear over the hydraulic and tough to catch on camera but the that coupler is jerking at a certain point in rotation. Almost like it is slipping and catching. The strange part for me is there is no backlash on a drop indicator, which means less...

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