Percision peizo probing help

nriviera

The probe doesn't need to go back to zero it just need to go to roughly the starting value. The "zero" is the value that the probe is at baseline (with some leeway for temperature fluctuation) that you set a trigger value above which it triggers. For you I'd set my trigger value to 480 and see if it works. DWC should go from grey to red when the value goes above the trigger value. If you are on analogue the Pot doesn't change the trigger value - you need to change the config files instead.

The other thing I found with them is they are very sensitive to how tight you have the screws and work best when it's on the slightly looser side (but not loose enough to cause the hotend to move). I've been mounting my piezo disc on a bit of car gasket maker which makes the discs a bit more robust to head strikes and over tightening. I can't find a picture right now unfortunately. Piezo's are a pain to get working because you have to redesign everything around them but they're great when they do.

The other thing that is worth mentioning with a delta is an under bed sensor might be better as you have a static Z (really wishing I went the Voron route right now!) which makes designing a hot end as easy as it gets.

gorf26

You are right the 478 is ok i found that if i set the g31 pXXX in config.g to somewhere between 5 to 15 higher it does work so 478 + 5 to 15, you will have to play with it but it works i did a g32 and had no miss hits probed good..

Thanks gary

peirof

Hi,

has you try to do a test of Precision Piezo

with this gcode

G30 S-1

And works?

Maybe, the height that PPO low searching the bed its not enought
and no encounter bed

gorf26

Yes have used G30 S-1, i have had it, or as it seemed working ok with G30 S-1,,
But when i try a G32 it will seem to probe ok then at one point or another it may probe good with the first hit then retract and on the second hit it messes up either hits and skids a few steps across the bed or i get the message no probe hit, it just seem to be very erratically and i can't get it working right, so for now i pulled it and went back to my old setup and i am doing a manual probing for now...
I tried different wire's all kinds of different settings in the firmware but with same results starts off looking good then at one point messes up and not always the same probe point.
Its a delta so i may just switch to the duet effector probe.. hopefully that will work better..

Thanks gary