G-code to determine probe offset

Such as Laser cutters (Must use the phrase 'sharks with frickin lazors' once per thread)
chderycker
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G-code to determine probe offset

Postby chderycker » Mon Nov 07, 2016 10:13 am

Hi,

I have a Kossel mini with auto leveling now the nozzel is the prob itself can somebody explain to me how i determine the offset between Z-0 and the probe.

Gr.

Christoph

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mhackney
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Re: G-code to determine probe offset

Postby mhackney » Mon Nov 07, 2016 10:21 am

Christof, what kind of probe are you talking about - using FSRs or something else?

With probes that use the nozzle as the contact point, there usually is not an offset for Z=0 unless there is flex in the system or the probe trigger needs to be taken into account. The way you figure this out depends on the probe and the firmware you are using as they are all different.

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chderycker
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Re: G-code to determine probe offset

Postby chderycker » Mon Nov 07, 2016 10:27 am

the nozzel is touching the glass and is flexing till the end-stop is triggered.

Firmware i'm using is Marlin.

Gr.

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Re: G-code to determine probe offset

Postby mhackney » Mon Nov 07, 2016 10:30 am

Still not enough information. Is the nozzle the probe or do you have a separate switch like the original mini kossle probe that used and Allen wrench?

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chderycker
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Re: G-code to determine probe offset

Postby chderycker » Mon Nov 07, 2016 10:37 am

See here: https://www.youtube.com/watch?v=e119OXzkk7s arround 2 min of play

No additional probe, the nozzel is the probe.

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Re: G-code to determine probe offset

Postby mhackney » Mon Nov 07, 2016 10:48 am

Ok, so your Z offset is whatever distance it takes to trigger the switch since the nozzle actually does have to move a few mm to activate the switch. the way to figure that out is to:

1) use the paper test to set the nozzle test to Z=0. However, on this sort of probe you have to be very careful not to depress the nozzle/switch or it will throw off the next step
2) then jog down until the switch triggers. the distance you jogged will be your Z offset

Sublime Layers - my blog on Musings and Experiments in 3D Printing Technology and Art

Start Here:
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Strategies for Resolving Print Artifacts

The Eclectic Angler

chderycker
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Re: G-code to determine probe offset

Postby chderycker » Mon Nov 07, 2016 10:54 am

thnx will try


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