BlindsFeeder center of part in tape doesn't line up with placer's idea of wher it sahould be

[John Swenson]

I'm using BlindsFeeders, I have most of it figured out, but when I click on the move camera to current position button the cross hairs are not on top of parts. 

My arrangement is vertical tape, I have the first four feeders 0402 and 10 0603. When I select the first feeder and press position button the cross hair is right in the middle of the part, but when I do it with any other feeder the cross hair is over the top edge of the pocket, this position doesn't pick parts very often. 

Btw I HAVE already run fiducial calibration. One interesting fact about that is when it goes to Fiducial one and two it is precisely lined up, but when it goes to fiducial 3 (top right corner) it is not lined up and has to use vision to find the center. 

Something really seems off here. 

This seems to me to be something to do with the printing of the base, like maybe something moved ever so slightly messing up where the hole pins are relative to the  fiducials.

I'm going to try reprinting the base and see if it comes out better.

John S.

[John Swenson]

So I reprinted the base, loaded parts in, put it in the machine, the exact same thing happens. When I use the "place camera at the current pick location" with an 0402 feeder the cross hair is near the center of the part, when I do this for an 0603 feeder the cross hair is just at the top of the part, it doesn't pick there. here is a  picture of each. Given that all the 0402 and all the 0603 are the same this does not sound like a rotation issue or fiducial calibration issue. 

When I place the tapes in the base there is no slop in the placement relative to the pins. The pins are just the right size so the tape presses over the pin. I do this with a microscope so I can clearly see what is happening. 

As can be seen from the pictures the 0402 is still a little up from the center, but the 0603 are too far from the center to pick reliably.

This leads me to believe this is either something in the printer (Bambulab A1) or in the scad file. So is there anyway to tweak some parameter in the software, or do I have to make a whole bunch of different bases with slightly different placements of the pins, put tape in each and then put them on the machine and see if any of them work?

BTW this is not a cover issue, putting tape in the base and no cover, then a fiducial calibration gives the same results.

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[Mike Menci]

Did you check your step/mm - 100 mm travel on ruler ? Becksplash compensation ? Are 3D printed parts in SCALE - holes 50 pcs = 200mm exact on spot ? ..