Rostock Max V3 Z-Probe Issues

dc42

@Phishing-Fish you can run M665 with no parameters to see what the current value is.

Also check what coordinates DWC reports after homing. X and Y should be zero, and Z should be about 5mm lower than the current M665 H parameter, if you are using our standard homedelta.g file.

Phishing Fish

@dc42 M665 results: Diagonals 291.500:291.500:291.500, delta radius 142.500, homed height 200.000, bed radius 145.0, X 0.000°, Y 0.000°, Z 0.000°.

After homing, DWC reports X and Y at zero, Z at 195. I would make my M665 H value 190 then, and see if it stops before crashing? Also, I'm unsure if I'm using the stand homedelta.g file, so I've attached it here.

; homedelta.g
G91                          ; relative positioning
G1 H1 X750 Y750 Z750 F5000   ; move all towers to the high end stopping at the end-stops (first pass)
G1 H2 X-5 Y-5 Z-5 F5000      ; go down a few mm
G1 H1 X10 Y10 Z10 F500       ; move all towers up once more (second pass)
G1 Z-5 F1000                 ; move down a few mm so that the nozzle can be centered
G90                          ; absolute positioning

dc42

@Phishing-Fish are you certain that you have the correct steps/mm set? For example, if you home the printer and then command Z to reduce by 25mm, does the effector drop 25mm?

Phishing Fish

@dc42 This looks like a potential issue. I brought the nozzle down to the bed and pressed the Z+25 button. Measuring it, it looks like it went up nearly 65mm. How do I go about corrected/calibrating this?

Phaedrux

@Phishing-Fish said in Rostock Max V3 Z-Probe Issues:

How do I go about corrected/calibrating this?

That's a pretty substantial difference. What are the motors you're using? 1.8 or 0.9 degree? Belt pitch? Idler tooth count? Microstepping?

Phishing Fish

@Phaedrux Motors are Automation Technology KL17H248-15-4A. Looking at what I can find online, I couldn't find anything related to 1.8 or 0.9 degree, but I did find a step angle of 1.8° ± 5%. For belt pitch, it's 2mm. Belts can be found here: https://www.seemecnc.com/products/gt2-timing-belt. Looking at the build guide for this printer, it seems like the idlers do not have teeth and looking at my printer don't see any. For micro stepping, this is what I have in my config.g: M350 X16 Y16 Z16 E16:16 I1

dc42

@Phishing-Fish your M92 command shows 200 steps/mm. With x16 microstepping, that would be correct if the motors are 0.9 degrees and the motor pulleys have 16 teeth. If the motors are 1.8deg then it would be 100 steps/mm with 16 tooth pulleys, or 80 steps/mm with 20 tooth pulleys.

If the correct steps/mm for your machine is actually 80 instead of 200, that would cause a commanded 25mm movement to move 62.5mm.

A Former User

This post is deleted!

Phishing Fish

@dc42 That worked! Changing the steps/mm to 80 in config.g and now the auto-calibration stops when it hits the board. Thinking back on it now, I should have known the motors were running faster than they should have, but it never crossed my mind. To confirm, I should run the auto-calibration, then M500 to save the results in override-config.g, and then put M501 at the end of config.g, so that override-config.g is used?

Thank you both so much for the continued help!

Phaedrux

@Phishing-Fish said in Rostock Max V3 Z-Probe Issues:

To confirm, I should run the auto-calibration, then M500 to save the results in override-config.g, and then put M501 at the end of config.g, so that override-config.g is used?

yes