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I pulled off the lead screw covers and took a look a the lead screw as it rotates. I think there's a slight bend, or incorrectly rolled leadscrew which is barely noticeable - relative position of the thread root seems to move in (towards bed) and out while the crest seems stationary. Weird, I'm...

Thanks Don, that's a good point. I did measure the peak use independently, but will test if the voltage drops during the taper turning cycle. It's an odd coincidence if that happens every 3mm matching the lead screw pitch.

Hello all, I'm fairly new to machining and am in the process of converting my lathe (Optimum TU2506 clone) to CNC. I notice banding at regular intervals (seems to match the Z leadscrew pitch of 3mm) as if the tool is being pushed towards the stock but only when both X and Z axis are in motion...