Calibration files

Tutorials
1

Please post any calibration files which you might have occasion to create to this thread.

Here’s a diamond-circle-square:

diamond-circle-square.c2d (6.5 KB) — note that this was prepared in an older version of Carbide Create and may not work properly in newer versions.

For CC514 and later:
Attached: diamond-circle-square.c2d (59.3 KB)

For drawing up a file see:

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2

My circle square test
circle-square-test.c2d (4.9 KB)

And my calibration spreadsheet to go with it
Shapeoko3-Calibration.xlsx.zip (14.7 KB)

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@WillAdams, do I have your permission to use this for my tutorial series?

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4

Yes, please, that’s what it’s for.

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5

Which reminds me, we should try the idea of:

  • milling a pocket for the Probe
  • positioning it in the pocket
  • probing for Z to get a distance to use to calibrate for Z
  • probing the corner and then the opposite edges to get values for X and Y
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6

I can honestly and confidently say I’m not a SME (subject matter expert) when it comes to calibration. But this is great, stuff. Working on a master list of topics, corresponding resources for said topics, and potential SMEs to reach out to for further in-depth details.

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I personally don’t do cut calibration, mostly cause I think that would take me longer and I’m lazy but also it adds additional variables (end mill wear, deflection).

I use a dial indicator with 2" throw mounted perpendicular to the axis I am measuring and a calculator like the one @mikep linked.
Along with running this g-code modifying it as I move to the next axis

G20 G91
G01 X-2.0F50 (Travel Intent)
G4 P2500 (Indicator Reads Actual Travel)
G01 X2.0F50 (Travel Back)
G4 P2500 (Indicator Reads Backlash)
G01 X0.25F50 (Travel Past Starting Point)
G4 P250
G01 X-0.25F25 (Remove Backlash on Starting Point)

8

Okay, here’s the simplest calibration file I can work up:

image
image2067×1440 160 KB

Just 4 circles on 90 mm centers. Vcarve them with a V endmill which is more obtuse than the tips of your caliper and then measure the bottom center points with the calipers, then calibrate for belt stretch per: https://docs.carbide3d.com/shapeoko-faq/how-to-calibrate-the-machine-for-belt-stretch/

c3d_calibration_vcarve.c2d (14.8 KB)

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9

Brilliant! Do you mind if I mention this idea in the ebook? Much better than cutting pockets.

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10

I don’t mind at all, sharing it is why I put it up.

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