Hi all, I have a Ratrig Killerbee 1510. One of the y-axis stalls during travel. And this causes the gantry to rack. I have checked the tension on the lead screw, the coupler and that is all fine. Next things to do/check on my list: - change cable from stepper motor to Blackbox; - next week I receive a new (might be a back-up) stepper motor, so I can try to change that; - also new couplers next week. What do you think is the problem, am I missing something? Best regards, Ferdy
Stepper motor wiring is by far the commonest culprit in cases like this. Check with a meter if you can, wiggling the wires to try to detect an intermittent connection - could even be a break inside the insulation, although accidentally gripping the insulation is quite common too. Not the only possible cause, but relatively easy to check. Could you share your max speeds and acceleration settings? Alex.
Thanks for your quick response Alex! Hopefully the wire is the problem, that is easy to fix. It's quite easy to change the wire and I have some new wires on hand. Max speed is 3000mm/min and acceleration settings was 200 steps/mm, but also 150 steps/mm didn't have affect. The controller box is near the motors so it's easy to try a new cable. When it solves the problem I can redo the wiring.
ACCELERATION - $120 - 122, not your steps/mm. 3000 mm/min is a little above the default (2500 mm/min) but shouldn't cause your issues. If you do know what the grbl settings for acceleration are it is u likely you have changed them, so my bet is still on a wiring problem. Alex.
Cable was not the issue, I built my table in december with cheap pine from the hardware store. That was dumb.. On the corner where the gantry shifts, the table is 1,5mm lower then the rest of the table.. So ordered the Ratrig aluminium workbench with leveling feet for the cnc. This will probably take a couple of weeks. So let's move on from there.
It looks like I fixed the issue. I did a couple of things: - Build a new aluminum frame from 4040 profile bought with RatRig; - Replaced the stepper motor with a spare one (this wasn't the problem); - Replaced all the thrust bearings for these; - Replaced the couplers on the Y-axis (this also wasn't the problem); So when I was working on changing these parts I was able to move the gantry by hand. Well, I should be able to move it by hand.. Rookie mistake! I have used way too little lubrication and I think the combination with the height difference in the table has been the biggest problem. The rest are just 'nice to have' upgrades. Wasn't able to fully test it today, so fingers still crossed.
Bonjour, Comment règle t'on le décalage de mouvement entre les deux vis/moteur axe Y sur workbee 1010. Il y a une léger "flexion" Entre les deux.. L'un ce déplace un petit peu avant l'autre?
Hey Ferdy! Did you solve the issue? I got the same thing on my KB1515... It worked fine for some time and all of a sudden I get y axis stalling on one side only...
Stalling after being fine for a while could be dust build up in leadscrew, could be grubscrews rattling loose on shaft coupler, or wiring damaged (strain points can damage cable inside insulation, but check terminals all good first)
Well what i'm going to do today is decouple leadscrew, test my motors by issuing same travel distance as i did when seeing the motor stall. If i get no stalling at all then i guess it's somewhere on the mechanical side like Problem with CNC lvl/square Leadscrew issue Coupling at leadscrew or parts Broken carriages? If i do get stalling when decoupled then it's eighter one of these Cables Current? blackbox So yeah pretty much alot to cover... oh boy
Some of those are unlikely (current adjusment for instance, if it worked fine and no one changed it...) But yes, eliminating mechanical vs electrical helps. Keep in mind some wiring damage only shows up when machine is tugging the wires (can look fine when testing motor off the machine)
Well i checked if i could see any pulling/tugging of cables going on and there's none. Every cable is pinch/pull/tugg free so to speak. What strikes me odd is the stalling always comes at the same spot (when i jog 900mm to the back and i let it home, it stalls at 200/300mm from homing pos) And always at the same side even after switching Y port cables. Always left side and never right side. I'm really thinking about what you said about the dust build up. So gonna check the leadscrews and my carriages i guess
