Z-probe Creating Incorrect Results

bsather48

Hey all,

Been having some very strange results with my z-probe and was wondering if anyone could shed some light on the issue. I was having no luck with G32. Today I'd had enough with fighting G32. I used G33 to create a bump map, the results were of course incorrect so I then redid each point by hand with the paper method. I'm getting very good first layers now, but this isn't really a solution because if I ever change anything I will have to go through this process again. At very least I have some nice data to go over, maybe that will lead to a solution. Thank you to anyone who tries to help.

Printer: DIY Delta (Kossel Mini derivative)

Firmware: Repetier 0.92.9

Board: Arduino Mega + Ramps

I'll link to my EEPROM settings, my config.h, and the results from redoing the distortion map by hand.

https://drive.google.com/drive/folders/0B8vk6yI7vT3lejkyS0pWSEQ4dkU?usp=sharing </div><div style="font-family: Arial, Verdana; font-size: 10pt; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: normal;">

bsather48

Forgot to mention, I am using an inductive probe, not sure if it's relevant but here's the model:

uxcell DC 6-36V NPN NO 3-wire 4mm Noncontact Inductive Proximity Sensor Switch LJ12A3-4-Z/BX

bsather48

These are the bump map before and after results for anyone who doesn't want to use g drive, Thew ones labeled original came from the z-probe, the second set of results was me redoing each point with the paper method.

ORIGINAL

ORIGINAL

18:30:29.400 : G33 X-50.00 Y-50.00 Z-0.388

18:30:29.400 : G33 X-50.00 Y-33.34 Z-0.237

18:30:29.404 : G33 X-50.00 Y-16.68 Z-0.137

18:30:29.405 : G33 X-50.00 Y-0.01 Z-0.094

18:30:29.409 : G33 X-50.00 Y16.65 Z-0.125

18:30:29.409 : G33 X-50.00 Y33.31 Z-0.169

18:30:29.409 : G33 X-50.00 Y49.98 Z-0.150

18:30:29.413 : G33 X-33.34 Y-50.00 Z-0.094

18:30:29.413 : G33 X-33.34 Y-33.34 Z-0.281

18:30:29.417 : G33 X-33.34 Y-16.68 Z-0.200

18:30:29.417 : G33 X-33.34 Y-0.01 Z-0.194

18:30:29.417 : G33 X-33.34 Y16.65 Z-0.187

18:30:29.421 : G33 X-33.34 Y33.31 Z-0.169

18:30:29.421 : G33 X-33.34 Y49.98 Z-0.125

18:30:29.425 : G33 X-16.68 Y-50.00 Z0.256

18:30:29.425 : G33 X-16.68 Y-33.34 Z-0.263

18:30:29.425 : G33 X-16.68 Y-16.68 Z-0.206

18:30:29.429 : G33 X-16.68 Y-0.01 Z-0.225

18:30:29.429 : G33 X-16.68 Y16.65 Z-0.244

18:30:29.434 : G33 X-16.68 Y33.31 Z-0.219

18:30:29.434 : G33 X-16.68 Y49.98 Z-0.163

18:30:29.434 : G33 X-0.01 Y-50.00 Z0.256

18:30:29.437 : G33 X-0.01 Y-33.34 Z-0.075

18:30:29.437 : G33 X-0.01 Y-16.68 Z-0.106

18:30:29.441 : G33 X-0.01 Y-0.01 Z-0.150

18:30:29.442 : G33 X-0.01 Y16.65 Z-0.206

18:30:29.442 : G33 X-0.01 Y33.31 Z-0.219

18:30:29.446 : G33 X-0.01 Y49.98 Z-0.219

18:30:29.446 : G33 X16.65 Y-50.00 Z0.719

18:30:29.446 : G33 X16.65 Y-33.34 Z0.181

18:30:29.450 : G33 X16.65 Y-16.68 Z0.088

18:30:29.450 : G33 X16.65 Y-0.01 Z-0.006

18:30:29.454 : G33 X16.65 Y16.65 Z-0.088

18:30:29.454 : G33 X16.65 Y33.31 Z-0.169

18:30:29.454 : G33 X16.65 Y49.98 Z-0.200

18:30:29.458 : G33 X33.31 Y-50.00 Z0.913

18:30:29.458 : G33 X33.31 Y-33.34 Z0.463

18:30:29.462 : G33 X33.31 Y-16.68 Z0.312

18:30:29.462 : G33 X33.31 Y-0.01 Z0.169

18:30:29.462 : G33 X33.31 Y16.65 Z0.075

18:30:29.466 : G33 X33.31 Y33.31 Z-0.050

18:30:29.466 : G33 X33.31 Y49.98 Z-0.156

18:30:29.470 : G33 X49.98 Y-50.00 Z1.131

18:30:29.470 : G33 X49.98 Y-33.34 Z0.856

18:30:29.470 : G33 X49.98 Y-16.68 Z0.556

18:30:29.474 : G33 X49.98 Y-0.01 Z0.369

18:30:29.474 : G33 X49.98 Y16.65 Z0.206

18:30:29.478 : G33 X49.98 Y33.31 Z0.088

18:30:29.478 : G33 X49.98 Y49.98 Z-0.069

EACH POINT DONE BY HAND

21:07:34.387 : G33 X-50.00 Y-50.00 Z-0.169

21:07:34.387 : G33 X-50.00 Y-33.34 Z-0.088

21:07:34.387 : G33 X-50.00 Y-16.68 Z-0.038

21:07:34.391 : G33 X-50.00 Y-0.01 Z-0.038

21:07:34.391 : G33 X-50.00 Y16.65 Z-0.031

21:07:34.395 : G33 X-50.00 Y33.31 Z0.000

21:07:34.395 : G33 X-50.00 Y49.98 Z0.000

21:07:34.395 : G33 X-33.34 Y-50.00 Z-0.169

21:07:34.399 : G33 X-33.34 Y-33.34 Z-0.125

21:07:34.399 : G33 X-33.34 Y-16.68 Z-0.100

21:07:34.403 : G33 X-33.34 Y-0.01 Z-0.069

21:07:34.403 : G33 X-33.34 Y16.65 Z-0.050

21:07:34.403 : G33 X-33.34 Y33.31 Z-0.038

21:07:34.407 : G33 X-33.34 Y49.98 Z0.000

21:07:34.407 : G33 X-16.68 Y-50.00 Z-0.125

21:07:34.411 : G33 X-16.68 Y-33.34 Z-0.100

21:07:34.411 : G33 X-16.68 Y-16.68 Z-0.044

21:07:34.411 : G33 X-16.68 Y-0.01 Z-0.044

21:07:34.415 : G33 X-16.68 Y16.65 Z-0.044

21:07:34.415 : G33 X-16.68 Y33.31 Z-0.044

21:07:34.419 : G33 X-16.68 Y49.98 Z0.000

21:07:34.419 : G33 X-0.01 Y-50.00 Z-0.156

21:07:34.419 : G33 X-0.01 Y-33.34 Z-0.050

21:07:34.423 : G33 X-0.01 Y-16.68 Z-0.063

21:07:34.423 : G33 X-0.01 Y-0.01 Z-0.119

21:07:34.423 : G33 X-0.01 Y16.65 Z-0.056

21:07:34.427 : G33 X-0.01 Y33.31 Z-0.106

21:07:34.427 : G33 X-0.01 Y49.98 Z-0.119

21:07:34.431 : G33 X16.65 Y-50.00 Z0.000

21:07:34.431 : G33 X16.65 Y-33.34 Z-0.075

21:07:34.431 : G33 X16.65 Y-16.68 Z-0.056

21:07:34.436 : G33 X16.65 Y-0.01 Z-0.056

21:07:34.436 : G33 X16.65 Y16.65 Z-0.050

21:07:34.440 : G33 X16.65 Y33.31 Z-0.088

21:07:34.440 : G33 X16.65 Y49.98 Z-0.088

21:07:34.440 : G33 X33.31 Y-50.00 Z0.119

21:07:34.444 : G33 X33.31 Y-33.34 Z0.019

21:07:34.444 : G33 X33.31 Y-16.68 Z-0.025

21:07:34.448 : G33 X33.31 Y-0.01 Z-0.025

21:07:34.448 : G33 X33.31 Y16.65 Z-0.056

21:07:34.448 : G33 X33.31 Y33.31 Z-0.038

21:07:34.452 : G33 X33.31 Y49.98 Z-0.056

21:07:34.452 : G33 X49.98 Y-50.00 Z1.131

21:07:34.456 : G33 X49.98 Y-33.34 Z0.125

21:07:34.456 : G33 X49.98 Y-16.68 Z0.019

21:07:34.456 : G33 X49.98 Y-0.01 Z-0.056

21:07:34.460 : G33 X49.98 Y16.65 Z-0.050

21:07:34.460 : G33 X49.98 Y33.31 Z-0.050

21:07:34.464 : G33 X49.98 Y49.98 Z-0.050

Repetier

Hope heater was off when measuring. Heater creates inductive field influencing probe results.

Futhermore your z probe height might be off 0.1-0.3mm as that seems the range of error.

You should test repeatablility of z probe results. So at one point call G30 several times. SHould return the same result +/-0.02mm. If not your probe is not good or not working at the best range.

bsather48

Repeatability is within acceptable range. However my heated bed was on, seems pretty obvious in hindsight that running what is essentially a giant coil under my sensor was a bad idea.

Thank you so much for the response!! That was a really stupid mistake on my part, I just assumed that the bed would warp a little when heated so I should preheat first so this gets compensated for.

bsather48

So I tried again without my heated bed turned on, and you were right It was definitely affecting my values. However it is still not correct. I'm not really sure where to go from here.

MartinH

What pin is your probe connected to?

Is it connected via a resistor voltage divider or a reverse bias diode?

bsather48

I have my probe connected to zmin. And I have the probe switching the 5v signal that normally comes from the endstop. It looks like this.