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Post by thomo78 on Sept 11, 2021 19:26:00 GMT -5
Hey guys! I've had my AR8 for two years and I love it. Recently my Y -axis started to stick and slip. I've ruined a few projects now. I've greased the ball-joint, but the problem persists and seems to be getting worse. Do I need to replace the stepper motor? Any help would be appreciated.
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Post by joeblow on Sept 12, 2021 11:57:12 GMT -5
Perhaps inspect the coupler that attaches the ball screw to the stepper. Might just need to tighten the set screw or replace with a new one.
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Post by germanguitars on Sept 13, 2021 7:35:37 GMT -5
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Post by Chad on Sept 13, 2021 7:36:21 GMT -5
As Joe mentioned, the coupling can be a big factor here...as can machine maintenance.
If you have not been keeping up on the regular machine maintenance (light machine oil on ball screws and guides daily....) then the friction can very easily overcome the steppers motors available torque.
*Additionally, lack of topical lubrication...will deplete the grease in the ball nut bearing much faster.
You made the right first step of lubricating the ball-nut, just be sure to wipe the machine down regularly with a good quality light machine oil (preferably a 3-in-1 product)as well.
When greasing the ball-nut bearing...if you released the cap screws that hold the bearing in place...make sure that you also re-align the ball screw otherwise a bind may occur. Details on bearing maintenance and alignment can be found in our "Ball-Screw Maintenance" video on our YouTube channel.
If the above does not help, please feel free to give our support team a call. We may be able to increase the stepper motor limits...to provide a higher level of torque.
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chipclark2000
New Member
Long time woodworker, furniture maker, new to CNC!
Posts: 20 
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Post by chipclark2000 on Sept 22, 2021 16:24:05 GMT -5
I was having a similar problem with the Y axis. It would stick for a moment, then move on. Then finally it came to a dead stop. I disconnected the ball nut so it I should be able to push it but it would barely move. Finally I shot a bunch of WD40 up in the guide rails and gave the gantry a shove and it broke free. Somehow a bunch of saw dust and wood chips built up in there.
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