Y Axis Bumping on brand new XXL

I just got my XXL and installed everything and got to the squaring up part and notice I have a major bump in the y axis. This isnt normal is it? Im guessing that one or more of the V wheels are bad. Is this something I should be contacting customer support about or is there a fix for it?

Gski

How are you identifying the bump? If it’s when jogging in CM3 that’s a software glitch — you can fix it by updating to Grbl 1.1 and CM4, see: http://carbide3d.com/carbideupdater

If it’s a regular repeating thing which matches the circumference of the wheels, then yes, contact support@carbide3d.com and we’ll get this sorted out. Note that it is possible to create a flat spot by overtightening (see: http://docs.carbide3d.com/support/tensioning-eccentrics )

EDIT: One other possibility is uneven Y-axis belt tension — the pulley on one side or the other has to jump a tooth to line up with the belt — this is more theoretical than likely to occur.

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You’re not by chance feeling this “bump” when moving the carriage by hand and powered down are you? If so that’s normal feedback from the stepper motors sending current back to the board. Don’t do this, it’s possible to burn up the stepper drivers. You can move it by hand slowly, but if you move it at any amount of speed you’ll create current.

If this isn’t the case disregard.

Dan

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Dan,

No its not that bumping from the stepping motors, I noticed that (bump) when I moved the XZ carriage too fast one way and didnt do that again. Thanks for checking. William emailed me last night and we talked about it. Pretty sure its a flat spot on a vwheel.

Gski

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