FluidNC working but two Problems

Software / Firmware Jackpot Board / FluidNC
1

Hello, I got my Lowrider v4 working after some back and forth. All in all a smooth progress with some small hickups during building.

Software wise i also got most of it to work. I managed to cut my first piece out of 12mm MDF. Skipped the crown and got straight into a Letter :wink: But I have two problems with Fluid NC.

  1. The Terminal keeps scrolling with “<Idle|MPos:63.000,203.000,3.000|FS:0,0>” Which is really annoying when trying to read mesages send by “M0”

  2. I copied the start and endcode from the Milling Basics But when I want to Probe the spindle lowers slowly unti it touches the probe then quickly lowers further skewing the whole gantry.

I checked my steppers, Z- is correctly wired down. When i press Home Z the Gantry moves up. I tried changing G1 Z10 F900 to Z-10 which made it worse….

any ideas what i need to change? For now i just deleted this part and set zero manually.

Tomorrow I will try to cut the struts and maybe the holes for my Wasteboard.

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2

Congrats!

1- Options, turn off verbose mode in the drop down, or change the polling rate to something longer, or turn off polling.

2- Does Z+ move the beam up? If so double check your starting Gcode and make sure you used the fluidnc version not the marlin one.

Run these,
G92 X0 Y0
G38.2 Z-110 F200 P0.5 (probe down set thickness )

What does the display say for your location?

3

Thanks, no.1 is fixed.

for number two, yes + moves up, homing moves up too. I tried switching theconnections and the machine tried homing downwards, so that is correct.

GCode is for GRBL/Jackpot.

I ran the above commands and had the following outputs.

WhatsApp Image 2026-01-03 at 21.26.16
WhatsApp Image 2026-01-03 at 21.26.161600×556 89.7 KB

I set the thicknes of my plate to 14mm because i’m using one from amazon. But my WPos Z is lower than the thickness of my touchplate?!

4

When you probe, it will set Z0 based on the location where the probe initially touches. However, it still has to decelerate, so it will actually move a little bit past where it initially touched. If you move to Z14, it should be at the top of the touchplate.

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5

If your probe is 14mm thick, you need to change where it moves at the probe.

G1 Z10 F900
M0 (MSG Remove probe)

You are setting the position to Z+14, and this line says move to Z+10 which is 4mm lower. Set that to at least Z18, but you really need to get a thinner probe or you will run into issues on larger stock.

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6

Thanks i will try this in the morning. at the moment

I’m not planing of cutting anything beyond 21mm and I thing for that it will work. And if i will run into some issues in the future i will modify my probe and witch the 14mm baseplate for some 1mm sheet metal.

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7

Okay, I created a textdokument with

M0 (MSG Attach probe)

G38.2 Z-110 F100 P14 (probe down set thickness )

G1 Z20 F900

M0 (MSG Remove probe)

and saved it as gcode. When running everything worked as intended, thank you.

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