Very strange behavior, CoreXY with external drivers

dc42

That looks OK too. So I think it's either very obscure firmware error or a short-circuit between those two signals (see my earlier message).

Capricorn

@dc42

to clarify how my extern drivers are connected:
all Step+/Dir+ from the ext. drivers go to +5V.
all Step-/Dir- from the ext. drivers go to the corresponding pins on the breakout board

dc42

@capricorn said in Very strange behavior, CoreXY with external drivers:

@dc42

to clarify how my extern drivers are connected:
all Step+/Dir+ from the ext. drivers go to +5V.
all Step-/Dir- from the ext. drivers go to the corresponding pins on the breakout board

That sounds good.

Are you using G1 S2 moves (after sending G91 to select relative axis coordinates) to test the motors individually?

Capricorn

@dc42

yes, i did, x and z go together and i can´t find a shortcut...
i also tried to redirect z to drive 8 or 9. Same behavior...

dc42

Do any other motors move when you command the Y motor?
Please check that you really do have +5V on the common 5V feed to the + inputs of the stepper drivers.

Capricorn

@dc42

no other motors affected by moving Y.
the Voltage at the + inputs of the drivers is 4.56 V

Capricorn

@dc42

meanwhile i tested another driver for z-motor (have more of them as spare) and also testet to set the
config to cartesian kinematiks. No luck, always x/z move together.... I´m frustrated....

Capricorn

@veti

thank you, for your help, i´m just about cabling the printer. i can test it, when everything else is running.

dc42

Are you sure that the power to your external stepper drivers is stable? I am wondering whether when they are driving the motors, the voltage could be dropping.