Electronics Forum | Fri Mar 28 22:01:00 EST 2003 | MA/NY DDave
Hi Yes I agree, yet this subject is about Tombstoning and oven profile or even oven working correctly across the entire product is a sub-set of how one gets those little chip babies to sit and stay where they belong. Flat and Heeling like their mast
Electronics Forum | Tue Mar 11 11:22:38 EST 2003 | slthomas
Is a water-soluble flux based paste an option for the bottom side? Then you could wash the residues from the board before wave. That's the only way we've tried that process. The difficulty we had was with some disturbed joints, apparently from s
Electronics Forum | Thu Apr 10 10:54:34 EDT 2003 | pjc
It will vary by placement machine mfg. and type. I had 4x Fuji CP3 (turret chip-shooter) and 2x Fuji IP2 (split axis general app-fine-pitch)and tracked component shrinkage at 0.05%-0.5% on average. Above 0.5% triggered maint. & process eng. response.
Electronics Forum | Wed Jun 11 15:59:11 EDT 2003 | stepheno
I've never worked on that machine but I won't let that little detail stop me from commenting. Are your nozzles clean, and have you checked your vaccuum levels? On every machine I do have experience on, management doesn't allow time for proper mai
Electronics Forum | Thu Aug 28 20:33:45 EDT 2003 | yukim
Tod, I am a user of 4797 and we too have this problem. A question regarding nozzles. How could I check whether they are worn-out? Only in vision check? We have worked for about 2 years without changing them, but worked just one shift.
Electronics Forum | Mon Jun 23 16:04:20 EDT 2003 | DG
There are some variations on how many parts are on a reel. A couple of distributors we use state it as a +/- 1% on a reel of 10,000. This only applies to chip parts (R's & C's) Most I.C.'s on Tape and reel are counted very accurately due to the pric
Electronics Forum | Wed Jul 09 19:05:06 EDT 2003 | randywomack
LOZ. Under-cured or out-of-spec(sloppily) applied resist is realistic. What other physics: Shiny resist surface is more prone to balls then matte finish. How about an operator eating fish & chips before handling the boards. Don't laugh... ... saw th
Electronics Forum | Thu Jul 03 15:03:39 EDT 2003 | Jim Nunns
My design group wants to change our route keep out around all SMT parts to 5 mil even under the parts with zero standoff. Are others in the industry routing under parts that have no standoff? My fear is that we will get shorting if the mask is scaped
Electronics Forum | Thu Jul 03 15:29:46 EDT 2003 | bpan
Hello Jim, We build boards that have traces under the parts all the time. For the most part, we have no problems but on one product we have an 0805 that bridges 2 traces with a very tight seperation and if any solder smears (under the part)we can and
Electronics Forum | Wed Jul 16 06:38:17 EDT 2003 | Wave
We have acquired an UltraPak 600C wave machine and are investigating the possibility of installing a centre support wire conveyor to eliminate the use of pallets. What is involved in this project and how feasible is it? The boards have bottom side SM
