I assembled my Shapeoko XXL this week and am now attempting the “Hello World” file.
I’m having some bad results and I think the culprit is my left Y-axis. Its sounds like it’s too loud, and it appears to be skipping or stalling in regular increments.
At first I thought it was the belt tension, but now I’m concerned that its the motor. See the link below and let me know what you think.
Can you move it easily by hand, though? If so, that would suggest the motor is not connected or there is something else wrong.
The motors should lock in place when you connect.
Then the motor and driver is probably ok.
Could be mechanical. With power off, does the Y-axis move smoothly (move it slowly)?
Are the Y rails parallel? Machine square? V-wheels too tight?
Pulley set screws loose?
Belt tension — the Z-axis should be guitar string tight (but careful not to bend the motor shaft): http://docs.carbide3d.com/assembly/shapeoko/xxl/step-5-belting/ on deep cuts it may help to remove one spring from the Z-axis temporarily, esp. if one hasn’t added a spoilboard on top of the wasteboard — it also helps to install the router as low as possible (installing the Makita adapter upside down will help). Some folks have found it helps to remove bolts which won’t stay tensioned (M4 Z-axis tension bolt, various V wheels with eccentric nuts), apply a thin bead of threadlock along the length of the threads, then reinstalling. See the video at: https://www.youtube.com/watch?v=_lIIb_PdziA Note that the X-axis motor is held in place on standoffs and if those bolts are loose this can cause belt tension issues.
It is also important to be sure that the collet is correctly tightened, the endmill fits correctly and doesn’t slip, and the router is mounted securely in the mount, and that the mount doesn’t shift. Note than endmill pullout can happen gradually, especially when profiling against tall walls.
Thank you for the detailed response. I think i’ve found the problem.
Pulley set screws seem to all be engaged.
The V-wheels were not all engaged - I’ve fixed this and they are all now securely on their tracks.
Belt tension was good.
After examining all the V-wheels, I noticed that one of the wheels has a small dent on the interior face. Moving the left Y-axis harness, I notice a THUMP every time this spot contacts the rail. (image attached)
I think this V-wheel needs to be replaced. Let me know. Thanks.
It might be that that’s just an indentation where the machine was resting and will go away, but best to eliminate that — let us know at support@carbide3d.com and we’ll send you a replacement and some spare V wheels.
I don’t know if it is me but I think that I see the pulley slipping. The set screws may be in the wrong place when you tighten them. One of the screws has to be on the flat past of the shaft. It is also possible that you have a bad set screw. Try to look at the end of the pulley and see if you can notice if the shaft travels with the pulley by looking at the flat part of the shaft.