Z axis lose steps
Hello everybody, a little thing with my z axis is that "losing steps". Axis moves pretty well by hand and when I give him order to move 10mm it moved 10mm :( but all my prints at height is smaller. I...
View ArticleStepper Motor loosing torque
Hi, I built a Prusa i3 from a kit, which worked well for over a year. But recently I found that my y-axis is loosing steps very often. X and Y axis use identical Nema 17 motors and A4988 stepsticks....
View ArticleRe: Did anyone used linear hall sensors on BLDCs for position sensing?
I worked on a much larger solar car motor (3 phase synchronous AC) and used the AS5048A for position sensing. It worked pretty well, although care must be taken to adequately shield the very high...
View ArticleMendel90/RUMBA/Marlin - Z-Axis too slow, X, Y work great
Hi all - Mendel90 printer RUMBA controller w/A4988 Pololu drivers Marlin firmware Repetier software I have calibrated motor moves with configuration.h in the Marlin firmware, and set the RUMBA...
View ArticleRe: Mendel90/RUMBA/Marlin - Z-Axis too slow, X, Y work great
You have a mendel90 not a Ultimaker so why are you using this config from [reprap.org] #define DEFAULT_AXIS_STEPS_PER_UNIT {80, 80, 200 * 16 / 1.25, ((200 * 16 * 39.0)/(11.0 * 7.4 * 3.142)) / 0.94}...
View ArticleRe: Stepper Motor loosing torque
Have you also tried switching just the motors, to see if the problem is not somewhere in the cabling? My guess would rather be that the problem is cable/connector related than it having to do with...
View ArticleMotor with too little torque
Hi RepRap community, I recently acquired a Prusa I3 kit and started building it. Everything went good so far until I got to the motor part. I configured everything and when I first tested, the motors...
View ArticleRe: Motor with too little torque
What is different between when you tested the motor on the printer and when you tested it off the printer? Cable? Load? Driver?
View ArticleRe: Motor with too little torque
Hi, The only difference is the load, it works fine if it has nothing to move and fails when the motor is plugged into the belt and has to move the extruder. That's the reason I'm thinking the problem...
View ArticleRe: Motor with too little torque
It could be that Marlin is trying to move or accelerate the motors too fast, either because you have it configured incorrectly, or you do not have the jumpers in your electronics board set for 16x...
View ArticleRe: Motor with too little torque
Hi again, I double checked the jumpers and they look ok (I also tried removing them 1 by 1 to see if they were changing the behaviour of the motor and because they do I deduce that they are doing...
View ArticleRe: Motor with too little torque
Do the other motors in the printer work? If so, swap in the motor in question and see if it works in another motor's position.
View ArticleRe: Motor with too little torque
I just swapped it for the extruder one and I have the very same problem. From this we can assume it's either a bad marlin configuration, a badly calibrated stepper driver or a problem with RAMPS 1.4...
View ArticleRe: Motor with too little torque
How did you set VRef on the driver? It sounds like you are underdriving the motor . . . - Tim
View ArticleRe: Motor with too little torque
VRef is about 0.95V, that's the value I see working better when not attached to the belt. I've already tried increasing it to 1.1V but the motor start skiping some steps and more than voltage that the...
View ArticleRe: Motor with too little torque
I am unclear what motors you are having problems with. In your first post (the topic) you use plural (motors) but later and in your photos you just talk about one motor. In short, I would like to...
View ArticleRe: Motor with too little torque
Hi, Sorry I didn't keep it clear from the beginning. When I first tested I just plugged in all the motors and tried to move them one by one with pronterface. Some of them just didn't move (Z axis) and...
View ArticleRe: Motor with too little torque
If the motors are really 2.6A as you wrote, and your drivers have .1 ohm sense resistors, the your correct VRef as calculated would be closer to 3 volts, not .95, so you are massively underdriving. I...
View ArticleRe: Motor with too little torque
Hi, I understand what you say but my pololu will only get to 1.2V, more than that and they stop working. I'm measuring VRef with a cheap multimeter I got, I basically place the negative pin in ground...
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