Andrew

Actually I wouldn’t use a soldering iron at all. I would use a sm reworking hot air gun we have at work. The only real issue is then not removing the components next to the driver.

I do realise it isn’t a simple task. But we have people that do this kind of thing often enough that it isn’t impossible. As long as the new devices will simply work I would be interested in trying. Actually, i’d get the professionals to try for me! I’ve got three samples turning up from ti, so I”ve got a few days to think about it.

Andrew

I should add as well that i’ve heavily modified the X and Z axis to remove any flex.

I’ve repeated the tests as 200mm/min and 100mm/min the original was done at 450mm/min, to me the results look the same. If it was backlash would you expect to see the same results at different feed rates?

See this image https://www.dropbox.com/s/6vqqfwvn4yei2vx/feedrate_circles.jpg

Could there be something up with the stepper motor? I would expect there to be more problems, if it was a stepper motor issue.

By the way thanks for taking the time to answer my questions!