M584 driver mapping ignores different steps/mm

Hi,
I tried to test my new CNC mill Y-Axis motors.
In the left corner: NEMA23 with 2.1A 1.8°
In the right corner: NEMA17 with 2.4A 0.9°
I mapped the drivers like that: M584 X0 Y1:4 Z2 E3
and set the steps/mm like: M92 Y12800:6400

But both steppers run at the same steps/mm.

Q: Can I use M350 X16 Y16:8 Z16 I1 instead?

I know, it isn't relevant in real life, but I wanted to test both steppers at once to figure out noise level, max. speed and torque.

No. If you are using multiple drivers on an axis, they must all use the same steps/mm and therefore the same microstepping. This is because the step pulse timing calculation is done once per axis, not once per drive.

Edited 1 time(s). Last edit at 06/23/2017 04:12AM by dc42.

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Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].

Thanks David for clearing it up.
I found a workaround by using the X-axis driver for one side, so I can independently define everything for testing.