I mitigated somehow the problem, but still, i am not confident
Now, i dont rotate the part. I place the chip on the tray, using the correct rotation. I think that when the head rotates the part, maybe it get missaligned a bit, but enough to be noticeable, as the chip is big
place height is very important. I am playing with this parameter, but I dont know well if i am doing things right.
Anyone here had success with BGA/TQFP100 components?
Hi derethor
I have the same issues with TQPF components, I've been in contact with Neoden and they have been helpful.
These were their suggestions
1. Don't rotate the part (which you're doing already)
2. Use local (to the component) fiducials,
3. Slow down the speed and add pick and place delay of at least 100ms
4. Use the rubber inserts for the heads this will improve stability. But you have to adjust your place height a little bit.
Now what I've found base on my own experience.
The coordinates coming from the CAD export you'd expect them to be 100% correct, and probably are. However the way the machine recognizes the part might be slightly different. So some manual adjustment of the coordinated might be necessary.
Using local ficucials does make a difference however it's not very practical.
Slowing down the machine does help and the delays are essential.
Now this is very important and no one will tell you about it. When you're doing the calibration of the heads, it's very likely that there is a difference between the simple single photograph or the rotate lens aggregate. When your parts are going to be rotated then you absolutely need to use the rotate lens function during calibration. if however your component is not rotated then the center point is better to be of a single photo and not the center of rotation... it's a headache but you can try it.
Once you get it right (trying with double sided tape) repeatability is very good.
I've managed to place a TQFP100 device several times on the same board quite accurately but it took me about 20 tries to get it right
Having the latest software (as reluctant as they are to give it to you) is very important. There are some bugs with the component geometry recognition on the old versions. It has improved vastly on the new one.
I hope this helps.
Cheers,
Panagiotis