Issues with Auto calibration

Veti

it does sound like a wiring problem to me. like a making intermitten contact.

wcmartino

@Veti Agreed. I can get it to trigger consistently. Just fails at the one point during auto calibration.

I have managed to get it to do a complete auto calibration once or twice but that is it.

Carlo

Not sure it will help
M208 Z0 S1 needs to be Z-0.2 or some negative number as the effector is going negative to measure strain

wcmartino

@Carlo I will give it a shot but I suspect this is not an issue as it does probe the first few point just fine and when it fails it just keeps driving into the bed.

Carlo

@wcmartino

Yeah not sure it respects limits during probing

dc42

@wcmartino said in Issues with Auto calibration:

When running the G32 command it hit the first 6 points with no issues every time. When it moves to the 7th point (P6) the nozzle crashes into the bed ever time, no green light. I changed the sensitivity to 40 and still does not trigger on that one point.

A couple of possibilities:

There may be a bad crimp, which causes one of the connections on the 8-pin connector to be lost when the probe moves to that position.
If the bed is not rigid and securely held down, there may be enough give in the bed at that point not to trigger the effector.

@Carlo said in Issues with Auto calibration:

@wcmartino

Yeah not sure it respects limits during probing

It doesn't respect the bed radius limit during probing, because it's often desirable to probe specific points that are outside the normal print radius.

wcmartino

@dc42 I had double and triple checked the wiring and thought everything to be ok even moved the head around manually and tapped the bed with no issues. I went ahead and secured the wiring harness a little better and wouldn't you know it, was able to complete auto calibration multiple times.

Wiggled the wiring while tapping the bottom and can see that it does in fact seem to be a crimp issue. Just happened to be in the right spot every time I checked it that and the fact that it failed on the exact spot led me to believe it might be something else. Going to re-crimp everything and see what happens. Will update when that is complete.

Thanks!!

Carlo

@dc42 Good to know Thanks

wcmartino

So I pulled harness for the sensor completely out. Stuck pins in the connectors to hook up an ohm meter. Jiggled, pulled, push etc on the cable ends and found there are no issues with the cable.

Plugged it back in same issue as before. I tied up the cable to the bowden tube to ensure nothing is getting pulled and everything seems to be working again. Do not see anything wrong with the solder connection on the effector either. Still not sure where the issue is coming from but definitely a connection issue.

I have another effector coming for another project so I will toss it on the printer in hope to eliminate that as a possibility.

Will update when I have more info.

Thank all!

Veti

what happens if you exclude that specific point from the bed.g?

wcmartino

@Veti I had not done that as I am able to reproduce the issue manually. If I manually moved the head by hand, wiggle the connector I can cause the failure.

By providing more strain relief for the connector it works without any issues.