Advanced up camera calibration changes the Z of the camera

[james.edwa...@gmail.com]

Dear group, I am trying to understand the Z of my up camera. I want the working height to be -22.5mm, which is the height of my PCB. I set this height for the up camera position and then ran the advanced calibration. At the end, the camera height had been set to a different value (-23.66). I don't understand why it changed. When I go to the "position" tab of the up camera and place the nozzle at the camera location, the nozzle goes to -21.66, +2mm higher than the camera Z. I don't understand this 2mm offset either.

Thanks for any insight!

Jim

[tonyl...@gmail.com]

Jim,

I looked at the machine.xml you attached in your other post, and I don't see any of the numbers you've quoted above.  Did something change between the test you did above and when you posted the machine.xml file?

Tony

[Jim Freeman]

Hi Tomy. As far as I know, nothing changed. Let me redo everything and I will send you the results tomorrow ( if I am still confused.) So from your previous message, I should ignore the " position " tab completely after I do advanced calibration.

Best, Jim

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[tonyl...@gmail.com]

Oh, something else I forgot to mention - it looks like you are using an older version of the test build.  Please upgrade to the latest version to get a fix to distortion correction.

[Jim Freeman]

Thanks. I will do that and report back. I exited the OpenPnP program (I had kept it alive for several days) and redid the calibration and it worked as you had described. The camera height remained as I set it before the calibration. Most likely operator error!  I will try the newest version and let you know.

Thanks, Jim

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