SOT-23 suddenly fails in vision

[jbasia]

Can anyone please share a SOT-23 vision setting? 

I did a few 100 flawlessly and vision suddenly fails. 

[mark maker]

Probably threshold slider too high.

Change of ambient light?

_Mark

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[jbasia]

Did 100+ SOT23 with no issue - Just now -  failure again. No any change in settings. Threshold can be adjusted in whatever way > Error stays.

After closing OpenPnP and re-starting it worked again fine.

[mark maker]

Needless to say, without further info, video or at least images and log, we cannot help.

Also please tell us what your ambient light situation is.

SOT23 are know to be problematic, as they can deteriorate to match the minimum area bounding box at an odd angle:

(just an illustration)

And it is easy to imagine that even a slight change of ambient light, perhaps lighting the bevels of the pins from the side, can make it go over the tipping point.

If nothing else helps, the Vision Compositing a.k.a. Multi Shot Vision can help by aligning pins separately on each side of the body. Of course this comes at some cost of extra alignment time. It is described and demoed here:

https://youtu.be/P-ZudS7QQeE?feature=shared&t=293

_Mark

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