About steps per mm.
I have ball screws and I don’t think they are imperial, I should check them.
I tried to adjust them by measuring with the caliper.
If you are certain that this number should be integer then perhaps this is due to inacurate measurements.
Are you sure that this should be an integer due to ball screw technical design?
I will check this also.
As for the spindle it is VFD and this is connected using RS485 serial connection.
I need to read more about it.
As for Bulkman 3D it’s a Chinese company, they should have some sort of support. I will ask them, they might have those data.
But it is a little bit weird. I’ve watched some guy on YouTube making the assembly of their machine.
He used for all the axes steps per mm=400. But in my case only the Z axis have this number. Other axes are bigger and it is visible at first sight.