Electronics Forum | Tue Dec 19 16:15:47 EST 2006 | johnw
we have fuji's cp-iv-3 machine made in 1993.we > are facing problem everytime when we change the > jobs(for example we change from pcbA to pcbB to > pcbA)even though program is same. There are some > mechanical adjustments like conveyor adjusted
Electronics Forum | Fri Dec 22 08:25:18 EST 2006 | aj
Hi, We had issues withthese parts when we first ran them thru our process. As the other lads have said - reduce thermal pad by 35-40%. ( we achieve this by using a dot matrix) . We also offset the lead apertures by 3thou ( i.e sort of overprinting)
Electronics Forum | Thu Dec 28 09:49:18 EST 2006 | slthomas
Tough call without seeing the board, but here's my best guess. You don't say if the glue dot is greater in height or diameter in the locations where you have printing (silkscreen), but I would guess that you might get either, or both, depending on ne
Electronics Forum | Wed Jan 03 10:34:18 EST 2007 | dphilbrick
Your failure rate should be as good or better than any other leaded part on your board. Have you done a reflow profile on this board. We typically sacrifice a board and drill a hole from the bottom and then imbed a probe under the part to get the tem
Electronics Forum | Wed Jan 03 10:41:47 EST 2007 | Rob
Consider this: The inner balls will be at a lower temperture than the outer balls in reflow, so if you cannot inpsect them then that may be where your problem lies. Are you reworking with a specialist machine that is directing the right amount of h
Electronics Forum | Fri Jan 05 11:41:40 EST 2007 | pms
Rob, I feel your pain brother...... The problem is that the old Mydata system is considered a "slow scan" system. Can't just use any monitor. We had to go with a replacement monitor from a company called Vartech Systems Inc. (www.vartechsystems.com
Electronics Forum | Fri Jan 05 15:10:15 EST 2007 | Bob R.
How about, "Who is the person who'll be called in to spend the weekend getting the machine back up and running after a crash? If it's your home phone number on the maintenance supervisor's speed dial then it's in your best interest to have a back up
Electronics Forum | Wed Feb 07 16:16:10 EST 2007 | mr
I have seen this before. Check: --Vibration of belt --Interference (part getting "brushed off" while reflowing bottom-side components --Some glues' cross-linking mechanism is impaired by the flux during migration in reflow, redering the glue useless
Electronics Forum | Wed Jan 10 10:16:11 EST 2007 | slthomas
Pretty labor intensive operation as has already been mentioned. Bang for your buck is about zilch unless you're dropping expensive stuff at alarming rates. If you're not doing it already I'd start logging missed picks/drops/rejections and figure out
Electronics Forum | Sat Jan 13 19:34:16 EST 2007 | geb
(Its a flex head) I have made a trial program to determine at what point it stops. This is how it goes: I load the program, push the start button it will zero and pick components with head 1. As soon as it finishes placing head 1 parts it halts wher
