Fluid NC Probe Issues

LowRider CNC Troubleshooting
1

Good Afternoon

I cannot get the probe on Fluid NC to work correctly and I do not know what the problem is. I go to probe, it touches the place with no issues but the Z Zero is always wrong. It is like 1 to 2 mils off. Any advice helps

V1 CNC Configuration File.zip (2.7 KB)

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G10 L20 P1 #selected_axis##probe_thickness#;$J=G91 G21 F1000 Z#probe_retract#

3

What gcode are you running?

When the probe triggers, if you have the probe plate thickness set, it will zero Z based on that at the point it is triggered. However, it still has to decelerate so it will move slightly past the trigger point. If you are using a G38.2 and then also setting zero from the current position, it will be slightly off because of that deceleration.

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image377Ă—511 9.49 KB

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Try deleting this part from the final commands.

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I did as suggested, it probes but does not zero out. I never had any problems before. I would set the probe plate on top of my material, hit the probe button on fluidnc and it would automatically zero out and raise 20.5mm. Now after it probes and zeros out, it is off by 1mm or 2mm

7

Ohhh. 1 or 2 mm. You said mil which I interpreted differently.

Put that command back then.

Is it too high or too low?

If it’s not going high enough, I’d lube your z screws and check the grub screws. It might be skipping steps or slipping.

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I fixed the skipping part by raising the feed rate in the probe settings; before, it was too low. I just did a test cut, and it did a fairly decent job, but it’s still going too low

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Yea I still think you’ve got a lube or loose grub screw issue.

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everything is nice and tight, and properly lubed

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Manually “probe” and zero by jogging down the bit to the right location and zeroing Z. Then run
$J=G91 G21 F1000 Z20

See if it’s in the right position then.

12

Good Morning

I did what you said and everything was good, I also did $J=G91 G21 F1000 Z20 to go up and $J=G91 G21 F1000 Z-20 to go down and everything was good as well.

I also attached the file I am using to text the machine. I use Rhino 8 for my design work and RhinoCam for my G-Codes

I am at a loss at what the issue could be at this point

Test Cut Gear Only_V1.nc (35.3 KB)

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You’re gcode doesn’t have any of the code to zero any of your axes. You would have to manually zero everything using the Webui or a pendant before you start to run your gcode. You could also paste in the gcode to do it at the beginning of your file. The directions are in the Docs.

I personally like to manually do it with my pendant.

14

Good Morning

I now have to manually do my zero as the Probe Interface in FluidNC is not working correctly anymore. If I use it, it zeros out to deep and screws up my cuts.

15

Good morning,

What version of Fluidnc are you using?

Have you probed the Xmin side and the Xmax side of your spoilboard to see if the beam is level?

Also, have you tried probing in different locations on your work piece to see how much the surface varies?

Just trying to rule out possible causes here.

16

Good Morning

I ended up deleting the existing configuration file, uploading a fresh one and so far everything seams to work good

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