Stepper Motors do not move (2 replies)

Hello everybody,

I am looking for a bit of help.
I know the subject come up often in this forum but I have not been able to find the answer in everything that has been proposed.
Trouble is the following:
I built up a mendel type of printer. Setup: Nema 17, Megatronics 2.0, pololu DRV8825, volts and amps correct. Using Marlin and repetier.
I used the board testing file and motors are all moving correctly, switching directions.
But when I upload marlin and use repetier, connection is ok (I can switch on/off heatbed/hotend/fan etc.) but not the motors...
They do not move but make a whining noise instead. And there is resistance if I try to move them.
So I must be doing something wrong in my configuration.h file...
for the steps, I calculated this: (considering the microstepping of the DRV8825 at 1/32, GT2 belt with a 2mm pitch and 20 teeths)
#define DEFAULT_AXIS_STEPS_PER_UNIT {160,160,5120,582}
#define DEFAULT_MAX_FEEDRATE {100, 100, 2, 10}

I lowered feedrates as sugested in another post but it does not change the problem.
I however do not see how this part of my configuration may change something to the movement of the motors.
Is there another part of the config file that I have to modify?

Any suggestion welcome!

Thanks a lot,


Tom