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Mirtec MV-2HTL programming: Easily fails parts a bit rotated?

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#63706

Mirtec MV-2HTL programming: Easily fails parts a bit rotated? | 7 February, 2011

Hi all,

This machine is pretty good. Thanks to all that have been helping me out with this. I have another question ... Some PCB have footprints that are a bit larger than the actual part (0805, 0603) so they move when they go through the reflow oven. The end result is a part that it ok but slightly rotated (like 2 or 3 degrees). It is still on the pads but because of the rotation, it doesn't match the pattern that was tought. I tried to enlarge the search windows a bit but they still fail. I could add an alternate picture for a rotated part but I'm not sure if that's the way to go. Is there a better way?

Thanks

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#63710

Mirtec MV-2HTL programming: Easily fails parts a bit rotated? | 7 February, 2011

I do not know what software version you have, but on older versions it is best to have a mounting inspector set to be the primary and then mask out all labels and solder so it just locates the part. Then add another mounting inspector for looking at the label only. If you have 4.x then you will want the character enhance option on the label inspector, and in 4.x you can set a rotation tolerance 5 degrees tolerance is what we use for all chip parts. TQFP SOIC dpak may need no tolerance or a tight tolerance for rotation, but the label inspectors you can always leave loose.

Don't be afraid to add many inspection windows to a part each to look for a different feature.

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