[solved] Strange behaviour of a blackbox controller when using too high feedrate

Hi, folks.

I recently built a sphinx55 using a blackbox v4-controller.

Actually i am testing and finishing the Mill. Today i encountered a strange behaviour:

Homing with 3 axes works like a charm, jogging around between the edges works well. Horizontal and vertical movement (x- and y-axis) works up until 7500 mm/min.

But the mill reacts strange when working with diagonal movement. if i try a "G0 X150 Y150 F1000" after homing, the steppers on the y-axis starts screaming und loosing massive steps. The X-axis movement seems to work correct.

I checked cabling several times but all looks good.

Any clue?

Best regards

a slightly clueless

Gerd Schelbert

 

Looks like i've found the reason:

7500 mm/min seems a bit too much. With 4000 as max xyz the mill works well again.