Micro stepping not taken into account ?

Hello,

I changed PC and now everything works, strange because the one I used before shows a latency of 15000 while the replacement one of 12000... so not much difference but works great now...

Thanks a lot for your help. I have learned quite a lot on this journey

Oh no

Now I have tried a long operation that I have milled on other machines so the G-code is good and I get a gap after a long operation on this Y AXIS ...

As if the motor is loosing steps in that direction...

What should I do now ? How can I diagnose the problem better and why I am loosing accuracy on this axis on long opérations ?

When using 8 micro steps per step the axis is vibrating but not generating a gap like this...

andypugh wrote:

Is this after a long feed move, or after a rapid move?
How far does the system have to travel to each maximum speed?

What are your following-error limits?

This is after a very long milling operation (about 80 minutes) on wood...

This operation has 2 parts a rough and a finnish, the rough is at 2m/min and the finnish at 5.4m/min
The rough is slow and seems to be ok it looks like the gap builds up during the finnish phase at high speed

FERROR is set to 1 machine unit so 1mm
After the operation I see about 6mm gap difference with the origin just for the Y axis

The X axis has the same micro stepping setting (16/step), the same FERROR (1), the same max speed (5.4m/s) and does not create gaps at all...

I am now checking the coupling and mechanical potential issues.. but look ok...

... and MIN_FERROR is 0.25mm

andypugh wrote:

Don't ignore the possibility of a mechanical problem, perhaps when the motor gets hot it loosens a coupling

I believe you were entirely right, this happened only after a lenghthy milling operation and we did tighten even more the couplings and the problem is gone.

Thank you so much for your help and to those like you who did provide support...