New build.
23.5 conduit, PLA prints.
All parts are either from V1 or obtained from V1 links.
Rambo 1.4
Everything seems square. Diagonals measure up right, and measuring from trucks to corners all match. I only have xyz steppers connected to board, no endstops or anything else.
Confirmed steppers are moving in correct direction. Movement is fine if I give core some help in moving, but other than that steppers can’t seem to move trucks.
Before installing core and belts, movement was super easy. After core, little more difficult. Belts, much harder to move.
I’ve now taken apart and rebuilt 3x thinking I had bolts to tight, bearing stuck, something.
Any help is greatly appreciated.
Thanks.
Sounds like a stepper wiring issue. Could also be that barrel connector from the power supply, most of us just cut it off and wires the power supply directly to the board.
The grinding noise is typically the stepper skipping steps, though you could also get a grinding noise if the grub screws in the pulleys are not tight and the shaft spins. The noise coming from lost steps sounds ugly but is nondestructive.
Make sure you have the belts routed correctly in the trucks, and make sure the belts are not too tight. They should be just tight enough that they make a low thrum when plucked. Also check your grub screws.
Make sure your firmware matches your build. For example, if you have the serial/series firmware and are doing a dual endstop version, one of the steppers on each axis will be unpowered and being dragged by the second stepper. Though if you’ve “Confirmed steppers are moving in correct direction,” this should not be an issue.
Removed the barrel connector and wired power supply directly.
Checked stepper wires, I’m using series, all wired tightly and correctly. I’m using the wires from V1, I didn’t make them myself.
Took one end of belts off, ran steppers. Both pairs turned as expected, so this should rule out having the wrong firmware on the Rambo, as if it was wrong firmware only one stepper would turn, if I have it correct in my head.
Checked pulleys. I had loctited when installing, and they are still tight and none were loose.
Happens no matter where, not just in one specific area.
I did loosen up belts and this helped Y axis to where it’s probably fine now.
Tried same on X, starting with extremely loose and tightening slowly. Could not find a sweet spot to where they worked without me giving them a little help.
Here’s a video, should help, also shows belt tension.
Thanks again!
Those are not my steppers. Did you get 0.9 degree ones or super high amperage? Maybe they are wired differently and the pairs are in the other positions?
I know ease of movement is relative, but I wouldn’t say mine moves easily with power off. It’s much more than just friction.
I’m going to try loosening them even more, and seeing if disconnecting steppers from board makes any movement difference as well.
I’d suggest going back to basics and ensuring you’ve got the coils in the steppers properly identified. Measure resistance to find a coil, or short wires until the motor gets hard to move. Colors of wire can’t be trusted - I’ve had them change between different batches from the same supplier.
Purchased the rambo directly from you. It’s running default firmware that came on it, 510S 2.0.7.2
Steppers are listed as
Black A+ Green A-
Red B+ Blue B-
Just checked one stepper with a meter and the pairs checked out.
I have X and Y wired the same, using wiring sets from V1 shop.
I have not verified wires on V1 harness are correct because I just assume they would be.
Harness connection to rambo is blue-red-green-black, with blue going to first pin
Loosened up belts to where they were to loose for the pulleys to grab them, then tightened a bit at a time till pulleys could grab. Still just grinds unless I help by gently pushing the gantry.
I ask because that would bypass many of the questions about the build friction and wiring order and also determine if the drivers are being powered properly.
We need to step back. Take the belts off plug the steppers in directly. If they work and have pretty good torque it is something with the series wires. If they do not, it is the steppers or the board.
Test every stepper and each X Y Z socket.
Be sure to unplug the power before moving the plugs.
Sorry for late reply, had to step away from it for a bit before I had a meltdown.
So I had done a restore defaults on the rambo as soon as I started it, as I do with any card I get.
I did the initialize eeprom. Shut down, turned back on, and was waaaay better. After that I did some loosening of bearings that felt a little tight, and now it seems to be working great.
Did the crown test print, no issues, next I’ll try cutting.
Thanks to all of you, the help is much appreciated, and thanks to V1 for coming up with this and all the docs and parts!
I had had the same issue with exactly the same noise, first time with poor connections of 4 pins dupont on the board(it is very sensible).
Then after I still had an issue on X1 where i had to cut and crimp again better its 4 pins Dupont.
It still happens sometime as i didn’t secured connectors on board with hot glue, but i seriously thinking of replacing Dupont with JST for board attachment.
