Help with Z Plus machining to deep

Have a Support question entered, but wanted to question the group.

New XXL with Z Plus install. I created a waste board file in V Carve Pro.

.75 material with a .85" cut depth.

Machine is zeroed properly.

When it machines, the cut depth is 1.27 - and sounds like it is bottoming out Z Plus. My bit height is fine and bit is tight - checked that several times and no movement.

Anyone have anything similar for an issue?

Thanks
GR

Can you share your gcode?
Did you configure your Shapeoko with the Z plus in motion
If you jog the Z 1", does it move exactly 1"?

Here is the code. I am heading down to try and measure the actual travel.

G1X26.3561Y5.2940
G1X26.3486Y5.2935
G0Z0.2000
G1Z-0.4857F20.0
G1X26.3410Y5.2940F30.0
G1X26.3332Y5.2958
G1X26.3255Y5.2988
G1X26.3182Y5.3032
G1X26.3117Y5.3087
G1X26.3061Y5.3153
G1X26.3017Y5.3226
G1X26.2987Y5.3303
G1X26.2969Y5.3381
G1X26.2964Y5.3456
G1X26.2969Y5.3532
G1X26.2987Y5.3610
G1X26.3017Y5.3687
G1X26.3061Y5.3759
G1X26.3117Y5.3825
G1X26.3182Y5.3881
G1X26.3255Y5.3924
G1X26.3332Y5.3955
G1X26.3410Y5.3973
G1X26.3486Y5.3978
G1X26.3561Y5.3973
G1X26.3639Y5.3955
G1X26.3716Y5.3924
G1X26.3789Y5.3881
G1X26.3854Y5.3825
G1X26.3910Y5.3759
G1X26.3954Y5.3687
G1X26.3984Y5.3610
G1X26.4002Y5.3532
G1X26.4007Y5.3456
G1X26.4002Y5.3381
G1X26.3984Y5.3303
G1X26.3954Y5.3226
G1X26.3910Y5.3153
G1X26.3854Y5.3087
G1X26.3789Y5.3032
G1X26.3716Y5.2988
G1X26.3639Y5.2958
G1X26.3561Y5.2940
G1X26.3486Y5.2935
G0Z0.2000
G1Z-0.6071F20.0
G1X26.3410Y5.2940F30.0
G1X26.3332Y5.2958
G1X26.3255Y5.2988
G1X26.3182Y5.3032
G1X26.3117Y5.3087
G1X26.3061Y5.3153
G1X26.3017Y5.3226
G1X26.2987Y5.3303
G1X26.2969Y5.3381
G1X26.2964Y5.3456
G1X26.2969Y5.3532
G1X26.2987Y5.3610
G1X26.3017Y5.3687
G1X26.3061Y5.3759
G1X26.3117Y5.3825
G1X26.3182Y5.3881
G1X26.3255Y5.3924
G1X26.3332Y5.3955
G1X26.3410Y5.3973
G1X26.3486Y5.3978
G1X26.3561Y5.3973
G1X26.3639Y5.3955
G1X26.3716Y5.3924
G1X26.3789Y5.3881
G1X26.3854Y5.3825
G1X26.3910Y5.3759
G1X26.3954Y5.3687
G1X26.3984Y5.3610
G1X26.4002Y5.3532
G1X26.4007Y5.3456
G1X26.4002Y5.3381
G1X26.3984Y5.3303
G1X26.3954Y5.3226
G1X26.3910Y5.3153
G1X26.3854Y5.3087
G1X26.3789Y5.3032
G1X26.3716Y5.2988
G1X26.3639Y5.2958
G1X26.3561Y5.2940
G1X26.3486Y5.2935
G0Z0.2000
G1Z-0.7286F20.0
G1X26.3410Y5.2940F30.0
G1X26.3332Y5.2958
G1X26.3255Y5.2988
G1X26.3182Y5.3032
G1X26.3117Y5.3087
G1X26.3061Y5.3153
G1X26.3017Y5.3226
G1X26.2987Y5.3303
G1X26.2969Y5.3381
G1X26.2964Y5.3456
G1X26.2969Y5.3532
G1X26.2987Y5.3610
G1X26.3017Y5.3687
G1X26.3061Y5.3759
G1X26.3117Y5.3825
G1X26.3182Y5.3881
G1X26.3255Y5.3924
G1X26.3332Y5.3955
G1X26.3410Y5.3973
G1X26.3486Y5.3978
G1X26.3561Y5.3973
G1X26.3639Y5.3955
G1X26.3716Y5.3924
G1X26.3789Y5.3881
G1X26.3854Y5.3825
G1X26.3910Y5.3759
G1X26.3954Y5.3687
G1X26.3984Y5.3610
G1X26.4002Y5.3532
G1X26.4007Y5.3456
G1X26.4002Y5.3381
G1X26.3984Y5.3303
G1X26.3954Y5.3226
G1X26.3910Y5.3153
G1X26.3854Y5.3087
G1X26.3789Y5.3032
G1X26.3716Y5.2988
G1X26.3639Y5.2958
G1X26.3561Y5.2940
G1X26.3486Y5.2935
G0Z0.2000
G1Z-0.8500F20.0
G1X26.3410Y5.2940F30.0
G1X26.3332Y5.2958
G1X26.3255Y5.2988
G1X26.3182Y5.3032
G1X26.3117Y5.3087
G1X26.3061Y5.3153
G1X26.3017Y5.3226
G1X26.2987Y5.3303
G1X26.2969Y5.3381
G1X26.2964Y5.3456
G1X26.2969Y5.3532
G1X26.2987Y5.3610
G1X26.3017Y5.3687
G1X26.3061Y5.3759
G1X26.3117Y5.3825
G1X26.3182Y5.3881
G1X26.3255Y5.3924
G1X26.3332Y5.3955
G1X26.3410Y5.3973
G1X26.3486Y5.3978
G1X26.3561Y5.3973
G1X26.3639Y5.3955
G1X26.3716Y5.3924
G1X26.3789Y5.3881
G1X26.3854Y5.3825
G1X26.3910Y5.3759
G1X26.3954Y5.3687
G1X26.3984Y5.3610
G1X26.4002Y5.3532
G1X26.4007Y5.3456
G1X26.4002Y5.3381
G1X26.3984Y5.3303
G1X26.3954Y5.3226
G1X26.3910Y5.3153
G1X26.3854Y5.3087
G1X26.3789Y5.3032
G1X26.3716Y5.2988
G1X26.3639Y5.2958
G1X26.3561Y5.2940
G1X26.3486Y5.2935
G0Z0.2000
G0Z0.8000
G0X0.0000Y0.0000
M02

Sorry - Yes I did the proper setup of the XXL / Z Plus / Bitsetter in CM Setup. Parameters were then uploaded to controller - no errors there.

I did a Zero of the bit on the waste board, and placed it next to a block that was 19.8mm in thickness. Raised Z and read change off of Jog screen - set in mm it traveled 12.421 mm.

So it looks like the steps per mm is not correct.

I am not familiar with entering commands directly - how would I correct.

The GRBL param $102 is 200 for a Z-plus, and 320 for an HDZ.
It looks to me like you have the HDZ configuration set in GRBL instead of the Z-plus, because 12.4mm / 19.8mm = 0.63, and 200/320 = 0.625

You can verify this by opening the log, going to the MDI window, sending $$, and then checking in the log what the value of $102 is.

EDIT: and then again, it would have had the opposite effect, or my brain is too tired
EDIT2: my brain was mush indeed. Since you were jogging manually, each time you jogged by say 1mm, it actually jogged by 1.6mm, therefore it took less jog steps to reach the top of the block, therefore in the end the jogged distance was much lower than 19.8mm. It all matches.

1 Like

Interesting - The overview screen called for Z Plus, but when I went into the setup screen it called for HDZ. I resent the configuration, and checked against the test block - moved correct z that time.

Going to keep an eye on it as I know that I set the Z Plus option, and it did show as the one programmed.

Running up to date version of CM 4.

I did some searching, but I am not experienced in using the MDI interface and reading the log file. I was able to open the log, but did not wee the $102 command.

Is there some additional info or a tutorial?

Thanks for pointing me in the right direction!!! Going to try another test run.

1 Like

There’s nothing special to know about the log and using the MDI commands, the only catch is that depending on the version of CM you are using, you may or may not have to checkbox to filter out status messages that keep getting displayed continuously in the log window, and it makes it hard to catch the output of the $$ command. You can either upgrade to that CM version (I can’t remember, maybe it’s only in the latest CM 5.x beta), or just do a copy of the full log window content, paste that in a file editor, and look for the $$, and then to each $xxx param being printed out, and you should find your $102.

But if distance is now correct, you can be sure $102 has properly been (re)set to 200 steps/mm.

Thanks again - just did a test cut and it was just over the .85" - good to go. Going out to cut another spoil board piece to run.

1 Like