Since it is the peak current that is controlled, the average current and hence the torque is offset by half the ripple. See Ģ) Even if the current is high enough to produce all the microsteps the current waveform has a ripple on it due to chopping, which has a fixed amplitude for a given motor and supply voltage. That means when microstepping the lower current part of the sinusoid cannot be achieved, so the steps become uneven with some steps microsteps missing altogether.
There are three reasons why lower current produces less accuracy.ġ) The Allegro drivers have a fixed off-time and a minimum on-time, which means they can't produce less than a certain current. I like both motors and the drivers to be not too hot to touch, but perhaps too hot to hold on to.
I have looked everywhere on the net but can't get any clear instructions on how to fix my problem. The red led comes on when i connect to usb or power from atx supply. My sanguinololu came assembled with Atmega644p and bootloader and sprinter installed and had been tested. My steppers have six wires but I have only used 1 to 4 looking from left to right with wires facing you as per drawing. I have wired up my end stops and they stop the motors shuddering when I try to send motors home so I assume they are working. I have wired up my stepper as in The wiring diagram included as a pic. It is difficult to turn by hand as if it is locked up but turns ok with power dissconected. When I try to home my x axis, the motor vibrates but will not turn. When I connect the Sanguinololu board, it is recognised in Pronterface and connects ok. I am using Pronterface with x/y feedrate set at 30mm/sec and z set at 10mm/sec. Red and black wires were swapped on the connector for the sanguinololu but i changed them to be back in order from left to right. They are Sanyo Denki 103H5208-10U41 Stepper Motor 1.8 Deg Nema 17. I have recieved my sanguinololu 1.3a complete circuit and my Stepper motors type 103h5208-10u41. Has anyone had any of these problems before? I would really appreciate any help you can offer. I haven't had any luck and I really hope I am missing something obvious. I have tried to wire the motors in order: Red, Blue, Yellow, Orange.īut I recent read a post that said it should be: Red, Yellow, Blue, Orange. I bought my used motors from Tony on ebay and the wiring is as follows:
I thought the wires might have been wrong, but i have checked it a few times and tried it a couple of different ways. I just tested the motor again and discovered that it only wants to move in the positive direction. I have the motor control on the lowest setting and I haven't changed any of the jumpers on the ramps board. It makes a noise and shakes but there isn't any real movement going on. When I try to move the motor it "vibrates", but it doesn't turn. I only have one motor control and its motor connected to a pre-assembled RAMPS 1.3. So I am now using Replictor-g on an Ubuntu. I tried to use resnapper, but had problems connecting with the arduino. I am getting so close to finishing this project!! The major structure of the prusa is assembled and all I have to do is get the electronics working.