What I just did was to move the X axis close to the end of its travel , measure a one-inch gap between the carriage and the stop with a digital caliper. Then I zeroed the x axis at that point, then sent gcode to move it to -.5- and it went to -.483. Repeated measurements fell in the .017 to .020 range. The screw is defintiely moving with the motor, and the carriage is not. The nut is mounted to the carriage securely, and I believe the nut is where the problem is. I could be wrong but everythign else seems to be operating normally. The Y axis has the same nut and thread types and .040 consistent backlash. I didn't measure the z yet. I suspect it's the nuts in both directions because everythign else is tight.
Replace the nuts? |