Tevo LM recent conversion and z step issues
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@crpalmer New G32
here's the bed.g
;; bed.g ; called to perform automatic delta calibration via G32 ; ; generated by RepRapFirmware Configuration Tool v3.3.4 on Sun Oct 10 2021 10:43:02 GMT-0400 (Eastern Daylight Time) M561 ; clear any bed transform ; Probe the bed at 6 peripheral and 6 halfway points, and perform 6-factor auto compensation ; Before running this, you should have set up your Z-probe trigger height to suit your build, in the G31 command in config.g. G30 P0 X0 Y132.28 H0 Z-99999 G30 P1 X121 Y69.86 H0 Z-99999 G30 P2 X129.9 Y-75 H0 Z-99999 G30 P3 X0 Y-150 H0 Z-99999 G30 P4 X-129.9 Y-75 H0 Z-99999 G30 P5 X-121 Y69.86 H0 Z-99999 G30 P6 X0 Y59.15 H0 Z-99999 G30 P7 X56.09 Y32.38 H0 Z-99999 G30 P8 X64.95 Y-37.5 H0 Z-99999 G30 P9 X0 Y-75 H0 Z-99999 G30 P10 X-64.95 Y-37.5 H0 Z-99999 G30 P11 X-56.09 Y32.38 H0 Z-99999 G30 P12 X0 Y0 H0 Z-99999 S6 ; Use S-1 for measurements only, without calculations. Use S4 for endstop heights and Z-height only. Use S6 for full 6 factors ; If your Z probe has significantly different trigger heights depending on XY position, adjust the H parameters in the G30 commands accordingly. The value of each H parameter should be (trigger height at that XY position) - (trigger height at centre of bed) -
@the_gibson What does the console report when you run the calibration. It should tell you what kind of error it measured and how well it corrected it. Here's from my last print on my tlm:
Calibrated 6 factors using 13 points, (mean, deviation) before (0.031, 0.033) after (0.000, 0.032)
You want to have the last number (deviation after calibration) to ideally be less than 0.04 for good prints.
Are you really running the bed.g calibration when each probe point takes about 15 seconds to probe from 30mm up? That's what you config.g says.
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@t3p3tony I have concerns about the steps/mm being off... these are the stock Nema17's from the TLM which are 1.8s.... wondering if I'm off there.
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@crpalmer
Calibrated 6 factors using 13 points, deviation before 4.965 after 0.453I am, because when I remove that I get an error about the Z probe not triggering when it plainly does. willing to address that one AFTER I print the board mounts.
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@crpalmer Conversely, do you have a known good config I could compare it to?
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@the_gibson try that autocalibration a number of times to see what it converges to
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@the_gibson That's never going to print well. The fact that the deviation is so high means that effectively the software is unable to compensate for whatever the hardware is doing. My TLM has many mods that make my current configuration useless to you. The last stock configuration I had was from 2018. You can look at it here in case it helps:
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@the_gibson The steps/mm look right for stock. Can you post the output of
M665
M666after you run G32 until it seems to converge (aka, the last deviation seems to stop getting smaller when you run the calibration)? I'm curious to see what corrections it ended up making.
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@crpalmer You may be right, but it worked fine with this deviation (I am assuming since the geometry didn't change) on the old setup.
I'll tune it further.
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@the_gibson I am however, pretty far from stock myself, just not on the motors. BMG, Mosquito, all the typical noise mods.
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@crpalmer Latest returns:
M665 Diagonals 397.190:397.190:397.190, delta radius 159.764, homed height 528.280, bed radius 155.0, X 2.836°, Y 1.408°, Z 0.000°M666 Endstop adjustments X-0.53 Y-0.74 Z1.27, tilt X0.00% Y0.00% -
@the_gibson what deviation are you getting from G32 when it converges (i.e. running G32 repeatedly untill the is very little difference between runs)?
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@t3p3tony High deviance no matter how many times I run it... I think I found why, and now I'm working on figuring it out. When the furthestmost forward Probe point is attempted, the sled for the X Axis is hitting the end of it's bottom travel, and bumping twice before it triggers the probe. That reading has to be throwing the whole thing off.
Going to work on adjusting the height of the bottom pulley, but is there a way to adjust the probing pattern? This is odd, because no mechanical changes were made, and the old smoothie board worked fine in this way.
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@the_gibson said in Tevo LM recent conversion and z step issues:
but is there a way to adjust the probing pattern?
yes the probe points should be specified in your bed.g
G30 P0 X0 Y132.28 H0 Z-99999 G30 P1 X121 Y69.86 H0 Z-99999 G30 P2 X129.9 Y-75 H0 Z-99999 G30 P3 X0 Y-150 H0 Z-99999 G30 P4 X-129.9 Y-75 H0 Z-99999 G30 P5 X-121 Y69.86 H0 Z-99999 G30 P6 X0 Y59.15 H0 Z-99999 G30 P7 X56.09 Y32.38 H0 Z-99999 G30 P8 X64.95 Y-37.5 H0 Z-99999 G30 P9 X0 Y-75 H0 Z-99999 G30 P10 X-64.95 Y-37.5 H0 Z-99999 G30 P11 X-56.09 Y32.38 H0 Z-99999 G30 P12 X0 Y0 H0 Z-99999 S6 -
Try reducing the Y-150 on line 11 of your BED.G (line 4 in Tony's post) Post that will move the front probe point towards the centre try starting from -140.
ie make line 11 to be "G30 P3 X0 Y-140 H0 Z-99999" as you have it the front probe point is effectively 2.5 mm from the edge of your bed.
HTH
Doug
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@dougal1957 said in Tevo LM recent conversion and z step issues:
G30 P3 X0 Y-140 H0 Z-99999
Testing now!
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How about that...
G32
Calibrated 6 factors using 13 points, deviation before 1.177 after 0.026 -
@the_gibson looking better has that solved the problem of the carriage fouling? also try running the G32 a few time see if it all settles in to lower figures (or the after deviation converges down so that each subsequent run doesn't get much different)
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@dougal1957 Already all over that... and yes, carriage is good now.
I'll be posting back with results shortly.
definitely getting better.
G32 Calibrated 6 factors using 13 points, deviation before 0.085 after 0.031 -
@the_gibson ok, looking good now.
G32 Calibrated 6 factors using 13 points, deviation before 0.036 after 0.035Going to try another print.
