Can't find first calibration point in XYZ calibration
Hi All
Frustrated by this problem, plus one other.
Did complete build last weekend, and getting filament sensor wiring error on self-test. Checked all the connections, upgraded f/w, and did a factory reset. NBG, so I hope Prusa will send me another sensor.
However, I thought I'd be able to print without that - after all, I'm not going to go through a whole new spool of PLA very quickly.
The blocking problem, though, is that my XYZ calibration fails every time. It goes through auto home, and z-axis calibration OK (or appears to), but when it comes to locating the four calibration points, it fails to find the first one. The print head does a couple of circles, and appears to be around the 0,0 point. After a bit it does some x- and y- axis movements, and the z-axis steppers oscillate. This turns the PINDA (what the hell does that stand for, anyway?) sensor off and on rapidly (the led flashes many times a second), so it looks like it's doing something.
However, it never finds calibration point 1, and stops with XYZ calibration failed message.
Also, what is a calibration point, and how does it detect one?
Any help overcoming this would be very appreciated: my frustrometer is beginning to redline...
James
Re: Can't find first calibration point in XYZ calibration
More information - when I do an auto home, the PINDA probe stops around 75mm to the right of the 0,0 point. However, the X-axis movement seems completely unrestricted, and in the self-test, the X axis passes with no problem.
Re: Can't find first calibration point in XYZ calibration
I had a problem exactly like yours (auto home near the middle of the bed and no calibration points found) and it was the x-axis motor pulley that was mounted inverted. Be aware that motor pulleys must be mounted differently in x-axis and y-axis. Recheck the manual carefully. It has taken me some time to find the issue (and prusa support sent me a new pinda probe believing the problem was a faulty one) but at the end it was the x-axis not properly built. If the pulley is not your case, you should check somrthing (even a small detail) in the building of your x-axis.
Re: Can't find first calibration point in XYZ calibration
Andrea
That wasn't exactly it, but it helped me fix it! The pulley was the right way round, but it was too close to the body of the stepper motor. I loosened the grub screws and moved the pulley out, and everything is just fine now. The belt is not centered in the printed orange part mounted on the stepper, but it's not touching it, so everything is OK.
Thanks SO much for your help. Really appreciated, and looking forward to getting this beastie churning out prints.
Great way to close a Saturday evening.
Thanks again!
James
Re: Can't find first calibration point in XYZ calibration
And I'm now about 3mm up in my first Benchy, and it's looking good!
Re: Can't find first calibration point in XYZ calibration
Glad to have helped!
Re: Can't find first calibration point in XYZ calibration
And my triceratops says a big Thank You!
Re: Can't find first calibration point in XYZ calibration
I have the same problem. I've adjusted the pinda probe a number of times. Sometimes the sheet moves, sometimes not.
If the sheet moves, obviously I abandon. If it doesn't the same message appears. about "can't find XYZ"
I've tried the following:
1. testing the bed. It was not completed flat. which was helped by loosening then tightening screws. Obviously the order of tightening is important and I probably didn't quite follow the rules in the manual.
2. I fiddled around with the belts until both x (200) and Y (277) are within the margins indicated (240 +/-40).
The hint that the x-carriage might be to blame, made me try all of the following (to no avail)
1. loosen the x-carriage and carefully tighten it with equal force on all screws
2. Loosen the pulley on the x-axis, such that it can't rotate but move sideways. By moving the carriage back and forth it settles to a point farther from the x-motor. (Then of course tighten again.) After this the paper moved, so I readjusted the PINDA.
While calibrating home (before the xyz calibratin starts) during y movement it makes a sound as if the carriage is hitting something, normal or an indication of failure?
Any help appreciated.
Groetjes Albert
Re: Can't find first calibration point in XYZ calibration
Hi Albert
If the bed is not completely level, then you are always going to have problems, and a noise when calibrating the Y axis is probably indicates a problem.
I found that the 9 bolts holding down the heatbed were not all the same size, and one head was higher than the heatbed. I moved them to different holes, and managed to get them all at the same level as the heatbed (or lower, which is also OK), and that's when I started calibrating.
I'd suggest you start by making sure all nine bolts are not above the heatbed, then tighten it down in the order suggested in the manual (centre, sides, corners). After that, take a good straight edge and check the heatbed is level in the X-axis, the Y-axis, and both diagonal axes. Until you've done that, I wouldn't even start to calibrate.
Solved at X-carriage Re: Can't find first calibration point in XYZ calibration
The problem of not finding the first calibration point apparently has a number of possible causes. This talk about readjusting the Y-axis bearings gave me the idea to check the X-axis bearings. I loosened them, then tightened them, but not as much as they were, and paid attention to equal tension.
That solved the problem. I think that a recommended force for those screws would be a good idea.
K.G. Albert