393 ipc and sm results

Electronics Forum: ipc and sm (Page 8 of 40)

Bow and Twist of PCB's

Electronics Forum | Wed Aug 19 05:00:56 EDT 1998 | Tom Blum

Hi there, I'm actually facing a lot of trouble with PCB's presenting up to 3mm of bow /twist at reception i.e. before assembly. The PCB size is 220 by 230mm. The boards are to be assembeled SMD double sides with 05.mm pitch on both sides. In order to

Pick and Place Machine Validation

Electronics Forum | Mon Mar 28 22:29:42 EST 2005 | msivigny

Appreciate the feedback SMTUser & link referral PeteC! Late 2004, EAGLE-EYED ONE changed its name to CeTaQ Americas. Still the same business, people and quality products and services. Changed for global synergy with our German parent and in support o

Solder beads and wave soldering

Electronics Forum | Thu Jul 06 03:03:56 EDT 2006 | ronalds

Thank you all for your input. The MF300S Multicore flux is rated for lead free. There is not much dross or contamination. We are using nitrogen. I've tested the boards with the curing test of IPC-TM-650. I think you're all right about the preheat.

Wave Cassettes and Heat convection

Electronics Forum | Mon Jan 15 11:41:56 EST 2007 | davef

Questions are: * Does the component take solder when you dip it in the solder pot to test the solderability of the leads? * Can you get full barrel fill when wave soldering a bare board? * Is your flux reaching the top of the board through the hole b

board stretch and IPC -D-300G

Electronics Forum | Mon Nov 12 16:14:47 EST 2001 | davef

Yes!!! How can we assemble boards with 20 pitch when we allow 0.008� error to the master art? Excellent question!!! IPC-D-300G has nothing to do with assembler requirements. It is written by and for fabricators, so that they can be comfortable.

Fuji Pick and Place Machines

Electronics Forum | Sat Jun 05 08:18:03 EDT 2004 | vinitverma

Hi Grant, If you're really looking for speed, I'm sure you're looking for another machine for doing the QFPs, BGAs stuff etc. In that even, why not have a look at the long proven Assembleon FCM machine!! It is a totally different concept with UNMATC

wave soldering and solder bridge

Electronics Forum | Mon Dec 17 11:55:08 EST 2007 | chef

I recently had the same problems, solder bridges on every thing I made, different customers boards, etc. I wave with no-clean flux. As I sorted out problems (pin holes, blow holes, splatter, etc.) I found a lot of variable factors. I changed flux,

Wave Cassettes and Heat convection

Electronics Forum | Tue Jan 16 07:07:17 EST 2007 | tk380514

Answers: The component does take solder, no problem We get a full barrel fill with an empty PCB but only on one of the holes, the other hole has so much copper around it. The flux reached the top of the PCB when I tested the empty PCB. The IPC-A-610

IPC Land Pattern Guideline

Electronics Forum | Thu Oct 20 20:44:15 EDT 2011 | davef

Design based on: * IPC-SM-782A: Gap 0.0157", Pad 0.0354"X0.0276" [along gap] * IPC-SM-782A Mod used on 32411A1 & Volvo Smart Switch: Gap 0.0157", Pad 0.020"X0.020" [along gap] * IPC-7351: Gap 0.008", Pad 0.0256"X0.0256" [along gap]

BGA and QFP orientation in trays for pick and place

Electronics Forum | Fri Feb 06 03:56:47 EST 2004 | JaMi Smith

BGAs and QFPs packaged in Trays are oriented with Pin 1 or corner A1 oriented towards the Pin 1 identifier on one corner of the Tray, which is usually identified by a chamfered corner. The Trays themselves are usually governed by JEDEC Registered Ou