Electronics Forum: stencil (Page 263 of 540)

Chain Cleaning

Electronics Forum | Wed Dec 11 12:43:03 EST 2002 | kerryn

We use our ultrasonic stencil cleaner. Before we change the wash solution, we clean pallets, chains, fingers, etc. It does a good job and takes only a few minutes.

Fine pitch paste release problems.

Electronics Forum | Mon Dec 16 10:23:42 EST 2002 | Grant Petty

Hi, I have checked the archives, but need some advise. We have a 256 pin 1 mm pitch BGA part of our boards, and we have having problems with paste release our of the holes for the BGA. We just cannot seem to get it right, and we have to keep the st

Fine pitch paste release problems.

Electronics Forum | Mon Dec 16 13:33:09 EST 2002 | pjc

square apertures provide better paste release than round in most applications. See IPC 7525 Stencil Design Guidelines

Fine pitch paste release problems.

Electronics Forum | Mon Dec 16 21:35:46 EST 2002 | grantp

Hi, We tried AIM no clean, and one other paste which I cannot remember the name offhand. We have been using Koki lately, and that's been the best. It seems to leave less residue behind in the stencil. Regards, Grant Petty Blackmagic Design

Fine pitch paste release problems.

Electronics Forum | Thu Dec 19 13:23:11 EST 2002 | gramsey

Now, this is good solid advice. If following this advice does not help there is something wrong with 1. the paste (reology failure) 2. the stencil (rough walls) 3. the board (bad design or fab) (in order of likelyhood)

Solder short-BGA with thermal pad

Electronics Forum | Fri Dec 27 14:11:18 EST 2002 | cnotebaert

We have placed these parts. I have not had problems with them but when I designed the stencil we reduced the app for the large thermal by 20% to reduce the chance of problems like your having. If the balls are close (.040-.050" or

Ekra E5 cleaner dispenser problem

Electronics Forum | Fri Jan 03 00:22:02 EST 2003 | Steve

We have an Ekra E5 that uses what looks like standard auto valve stems to dispense the cleaning fluid. They leak.. Are they just standard schrader valves or are special to withstand the chemistry of stencil cleaner?

Stenciling chipbonder.....

Electronics Forum | Wed Jan 22 14:14:56 EST 2003 | Stephen

Most of the design considerations will be for the wave soldering of the SMT parts. Have you considered selective soldering pallets or masking as an alternative? One problem I have seen with the epoxy process is parts that are high off the board and t

Stenciling chipbonder.....

Electronics Forum | Wed Jan 22 17:36:40 EST 2003 | davef

Now that's hitting low!!!! "Whatta they stick you for for a 6'er of ESB out there, ol' buddy?" Now that's watcha call "comin' out swinging". You know how to hurt a fella. Maybe, 6 and change. Yever do any Pyramid?

Stenciling chipbonder.....

Electronics Forum | Thu Jan 23 09:17:08 EST 2003 | bdoyle

There's a Red Hook brewery about 40 minutes south of here. I've taken that tour a few times. Don't let Dave fool you though, he's changing tastes and is beginning to import beer from Maine.

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