David,
The current on the Mini-Rambo was just set to the default in the advanced config, so about 0.75A. I upped it to about 1A via M907 (value = 185) but it made no difference to the movement, just whined slightly more when holding position.
From the config:
I've been out this morning to see the friendly fellas at BcnDynamics and nearly found enough Spanish to get myself a RAMPS 1.4 with a Mega and 5 Pololu boards - "He roto mi rambo. El eje 'Y' es....(blows a raspberry)". So after 5 minutes, some pointing, english, accidental french and bad spanish, I got what I wanted. :) So this afternoon, I'm going to have fun configging that (my PRUSA was all pre-configured so I've not yet delved into Marlin as much as I'd like to).
I've just noticed some melting on the heated bed connector when I was disconnecting my Mini-Rambo. If I need help on that, I'll start a new topic as it's certainly not Stepper related! I don't believe in coincidences like these so this for me is evidence towards over-heating in general and linked to my Y axis driver failure. I'm going to print a little cabinet for my ramps and build in a fan and some decent airflow (maybe cable trunking surrounding the board to make the wiring nice and neat).
Many thanks for your input David (and Olaf).
John
The current on the Mini-Rambo was just set to the default in the advanced config, so about 0.75A. I upped it to about 1A via M907 (value = 185) but it made no difference to the movement, just whined slightly more when holding position.
From the config:
// Motor Current setting (Only functional when motor driver current ref pins are connected to a digital trimpot on supported boards)
#define DIGIPOT_MOTOR_CURRENT {135,135,135,135,135} // Values 0-255 (RAMBO 135 = ~0.75A, 185 = ~1A)
I've been out this morning to see the friendly fellas at BcnDynamics and nearly found enough Spanish to get myself a RAMPS 1.4 with a Mega and 5 Pololu boards - "He roto mi rambo. El eje 'Y' es....(blows a raspberry)". So after 5 minutes, some pointing, english, accidental french and bad spanish, I got what I wanted. :) So this afternoon, I'm going to have fun configging that (my PRUSA was all pre-configured so I've not yet delved into Marlin as much as I'd like to).
I've just noticed some melting on the heated bed connector when I was disconnecting my Mini-Rambo. If I need help on that, I'll start a new topic as it's certainly not Stepper related! I don't believe in coincidences like these so this for me is evidence towards over-heating in general and linked to my Y axis driver failure. I'm going to print a little cabinet for my ramps and build in a fan and some decent airflow (maybe cable trunking surrounding the board to make the wiring nice and neat).
Many thanks for your input David (and Olaf).
John