Quote Originally Posted by richie00boy View Post
Just as a last check, here is a video of the leadscrew showing the runout. The leadnut housing has been unbolted from the gantry to show how it rocks due to the bent leadscrew. Hopefully you will agree that this is the cause of the problem.

http://www.readresearch.co.uk/person.../leadscrew.mp4
Take it you have the mounting bracket loose.? . . . But No not at all I've seen worse than that an still work fine.!!. . . . . For this to cause stalling it should only possibly be at very high speeds and even then with that amount of wobble over such short distance I doubt it would.!!

If this is causing your stalling then I think you may have the motors tuned too high.? What do you have set for Acceleration & Velocity in motor tuning for each axis.?