Very mysterious dropping steps on one Y axis motor...I'm starting to lose it!!

[dazp1976]

Why use 86mm motors?.
48v is low for that size. Could be dropping out.
You have DM860 drivers so use them.
72vdc, no less.

[Hatchett Job]

Why use 86mm motors?.
48v is low for that size. Could be dropping out.
You have DM860 drivers so use them.
72vdc, no less.

I don't know much about this.
I got all the components as a bundle from a local CNC building company.
The 48v power supply is what came in it, should I change it to 72v??

[dazp1976]

I don't know much about this.
I got all the components as a bundle from a local CNC building company.
The 48v power supply is what came in it, should I change it to 72v??

Yep.
I'd move the 48v to the smaller DM452/542, ditch the 36v (keep it for bench testing other things maybe), and install a new 72v onto the DM860.
I usually buy these types of items on Aliexpress, pretty easily available.
This should improve any velocity anxiety when it comes to losing steps.

Dual motor axis are best ran with one as a slave.
Coils on both the motors should be wired identically to avoid inductance/resistance differences. Esp when it comes to 8 wire units.

[Hatchett Job]

So I tried running my test tool path with step low active selected on A axis (my right hand Y axis motor) and then on the Y axis.
Both times A axis gained steps, am I missing something?