Electronics Forum | Wed Apr 29 17:51:44 EDT 2009 | smt_guy
One more thing: I have a Panelized PCB with 8 boards on the X directions. As I move to the next PCB towards the right my misalignment moves to the right by 0.02mm. By the time I reach the 8th PCB I'm Off by between 0.12mm to 0.14mm. My fine pitch
Electronics Forum | Mon Aug 18 12:02:18 EDT 2003 | russ
It all dependes on the de-paneling method. V-score - .100" is probably to thick for manual seperation. There are machines that I believe can cut through a V-Score up to .125" or greater Breakaway tabs - .100" is getting to the limit when doing t
Electronics Forum | Thu Aug 30 22:36:36 EDT 2001 | davef
While I don't understand why, this topic comes-up fairly often on SMTnet. [That the topic recurs indicates there truely is a problem and I'm just too doopy to understand it.] Several things: 1 Check the fine SMTnet Archives. 2 Some glue suppliers kn
Electronics Forum | Thu Apr 30 08:33:42 EDT 2009 | kpm135
In regards to your panelized PCB it sounds like your step and repeat in you pnp program is slightly off, by 0.02mm from the sound of it. Are all of the components moving in the same direction as the fine pitched IC? I don't know what type of machin
Electronics Forum | Fri May 08 16:57:13 EDT 2009 | rmitchell
Hi, I have had similar issues. First as the above replies suggest pcb fids are better than panel scrap fids, even if you have to use fids under QFP's just palce those parts last. If your machine has board skip. Place 1-2 QFP's on pcb # 1 and check
Electronics Forum | Thu May 14 15:51:24 EDT 2009 | dnachristen
I've gone round and round on this very subject with our manufacturing engineer. He prefers to use panel fiducials and I prefer board fids. I've seen the result in placement from bowed PCB's in the machine. Skewing the board a fraction will throw off
Electronics Forum | Wed Apr 08 08:34:23 EDT 1998 | Scott Cook
| | I agree with Michael, scoring works great. interesting feedback. | The change to scoring has saved countless hours of trimming tabs, and is much easier on the wrist. As mine in scoring, your experience in a routed, drilled web tab breakaway is
Electronics Forum | Tue Apr 07 15:55:37 EDT 1998 | Michael Allen
| I'm also in the "Don't score it" camp. Routed breakaways are much better. If your wave solder process has decent control on the wave height, you shouldn't worry about flooding the boards. | The fine pitch consideration for panelizing - Since you
Electronics Forum | Mon Jun 19 14:53:28 EDT 2000 | Mike Demos
I'm looking for some design paramters for perforated tabs. These are the tabs that connect the circuit board to the break-away pannel material. I've never used these before, but I've seen some that have reportedly worked well. These tabs are ident
Electronics Forum | Fri Apr 03 08:37:10 EST 1998 | Scott Cook
| We are in the process of deciding whether to change a PCB product from a single board to a 3 up panel array. Could you please advise on the most effective removal design, either scoring or snap off, taking into account that material utilisation is
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