Hello, I recently purchased and built a 1515 Lead machine and during my first project the machine stopped working correctly. I have been using an industrial CNC at work for a while now so I am not completely new to CNC's but the machine my employers have requires little to no maintenance so I'm still a bit of a novice as far as repairing goes. From looking at the project I was working on, the machine ignored Z commands and pushed through cuts that should have been higher in the Z direction. Now when trying to move or home the machine, the x axis is only responding intermittently. I can turn the machine off, unplug the motor, turn the machine back on and jog the machine and the unattached motor works fine. Despite this, it's getting held up when I reconnect it to the lead screw. When I jog the machine, the z and Y axis are working fine but the X axis will move a small amount then get locked up after moving a few millimeters. I’m guessing there is something too loose, too tight, or something that has become misaligned but I cannot find it for the life of me.
my X had some sticky spots (a screw head was hitting the rail, sometimes) and I had to do a combination of slowing down the axis (both maxrate and acceleration) and tightening the screw/filing the rail away for clearance. it still touches, but not enough to stop it moving.
After more testing, the x axis is struggling to move on its own no matter where it is. There are no screws impeding the path of the gantry or causing friction behind the Z gantry with the X axis supports. I can jog the machine 1mm at a time but it will not jog. I am able to move the gantry along the X axis with the machine turned off if I use a wrench on the nuts at the end of the lead screw.
that leadscrew is much too tight, check the nut adjustments, and alignment etc. also the bearings on the ends of course. remember to only turn the motor with the motor disconnected from the BB, and turn the BB off before connecting/disconnecting
1) During the crash something may have become moved, bent or damaged: Perform a check on all the mechanicals making sure its all perfect, machine is trammed, and everything runs smoothly without binding Tramming: A generic guideline 2) Apply some Dry/PTFE lubricant to the lead screws 3) Make sure your Grbl Settings are correct, if Acceleration or Max rate is set too high, it can cause stalling: Grbl v1.1 Configuration and Grbl v1.1 Configuration 4) Check wiring, intermittent loss of one of the 4 wire's connection can cause a stall docs:blackbox-x32:faq-identify-motor-coils [OpenBuilds Documentation] 5) Check that current is not set too high, you'll the the Fault indicator light up: docs:blackbox-x32:currentadjustment [OpenBuilds Documentation]
