driving second Y axis with motor 4

Started by vicente95650 on Oct 1, 2013 in TinyG Support. 1 reply, last activity Oct 1, 2013.

vicente95650 Oct 1, 2013 #

I have a motor on each of my two Y axes (shapeoko) and am trying to makes sense of the documentation (conceptual issue) and also trying to determine why homing stopped working once I added the 2nd Y axis. The homing process begins correctly but as soon as the homing switch is tripped, the Y axis motors seem to fight each other (the Y carriage does not move but simply vibrates).

I am using the following mapping from motor to axis:
motor 1 - X axis
motor 2 - Y1 axis
motor 3 - Z axis
motor 4 - Y2 axis

I am trying to set the motor parameters (except for polarity) for motor 4 to be the same as those of motor 2, and this is where I become confused because motor 4 expects units for the parameter "travel per rev" to be in degrees whereas motor 2 expects units to be in mm!

I am of course expecting that the A axis settings are irrelevant since motor 4 is no longer mapped to the A axis.

vicente95650 Oct 1, 2013 #

It seems like I fixed my problem.

The only real problem I had was with my (poor) wiring of the homing switch.
It turned out I had broken my wiring once I connected my 2nd Y axis motor.

The conceptual problem I had with the documentation was simply that I was remembering incorrectly what I had read! I can in fact set the "travel per rev" parameter for motor 4 in mm as I need to.

All is well with homing my Shapeoko using dual Y axes!

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