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interchangeable stencil frame systems

pzohbon

#6457

interchangeable stencil frame systems | 2 May, 2001

Does anyone know of any interchangeable stencil frame systems? We use Alpha's Metals Smart Frame system,but it is heavy and cumbersome.

Also, are there any quality issues that prove the interchangeable system is not as repeatable as the permanently fixed stencils. Thanks

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#6466

interchangeable stencil frame systems | 3 May, 2001

Yes, Alpha's frames help develop upper body strength.

All stencils, regardless of the type of frame, can have loose foils. Stencils with removable foils require a specialized storage system for the foils and lots of band-aids.

Some foil frame supplier snipe at other frame suppiers by implying that their frame does a better job of "stretching" [I don't remember the precise term they use, but it's kinda like that.] the foils. The day some rinkydink mechanical clamp or a rubber bladder exerts enough force to stretch stainless steel, I want you to call me and say "Halaluya, Bother Dave. Our mission is complete. Halaluya, Bother Dave. The sun is shining on the other side of the water." And other exhaultations that seem appropriate at the time. Until then just tell em to quit it.

Foil stencil suppliers are: * IIT (Proframe) 916.852.8044 fax 8172 ($135 24hr) * Alpha Metals (Tetra Frame) 408.562.2033 fax748.9552 * PNC (Accu-Frame) 115 East Centre St Nutley, NJ 07110 973.284.1600 fax1925 http://www.pnconline.com sales@pnconline.com Calvin Switzer * Chepaume Industries (Tecfoil) Chepaume Industries 6001 Airport Rd. Oriskany, NY 13424 (315) 768-7001 (315) 768-7002 Fax 0270 Melissa Foppes chepaume@borg.com http://www.ieec.binghamton.edu/ieec/ieecpche.html

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pzohbon

#6468

interchangeable stencil frame systems | 3 May, 2001

Thanks for the help!

Do you happen to know a good bandaid manufacturer?

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#6469

interchangeable stencil frame systems | 3 May, 2001

I'll leave that to others, but this is far more interesting ... http://www.madsci.org/posts/archives/aug2000/965825243.Ph.q.html

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#6471

interchangeable stencil frame systems | 3 May, 2001

what are these kids doing in the dark with band-aids anyway? I'll bet you could get the same effect with Kapton tape (maybe yellow light?) Seriously, I use the IIT proframe Dave mentions down to 25 mil but have gone back to a permanently mounted foil for smaller or trickier stuff. It works well, it's not much heavier than a cast frame, the operators don't object and IIT figured out a (secret) way to treat the edge so you won't need the nurse standing by. John Thorup

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pzohbon

#6472

interchangeable stencil frame systems | 3 May, 2001

We produce a board right now with a QFP that has 20 mil pitch and we are seeing problems with the solder deposition. I believe it to be a cleaning issue which we are addressing.

Soon we will be pasting for bga's. Is there a problem with using interchangeable stencils because of snap off, tension, etc.

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#6476

interchangeable stencil frame systems | 4 May, 2001

We have had some success printing 20mil pitch with our IIT Proframe. It takes some babysitting, and you don't want your operators to be changing these things out every hour or you'll be buying lots of them.

Pulling tension in one direction gives rise to some inconsistency of print gap, but negative snap off alleviates some of that. Kind of hard on stencils, though, and I wouldn't recommend it for anything other than protos.

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Michael Parker

#6478

interchangeable stencil frame systems | 4 May, 2001

Kapton tape is anti-static, that's why we use it so much in this industry. If you are seeing yellow light, either whatever you are pulling ain't Kapton, your Viagra is stale or whatever you had for lunch, I want a double!

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#6482

interchangeable stencil frame systems | 4 May, 2001

actually the "yellow lite" part of my posting was simply spoofing Dave's light up band-aid wrappers. But seriously (again) most high temperature Kapton polyimide film tapes, like 3M #92 and #1205, develop a considerable charge when unrolled or removed. This was a mainstay demonstration in 3M trade show exhibits for years and has been discussed in the archives (RIP). Most manufacturers produce a low or antistatic version like 3M #42 or #5419 that is specifically intended for our kind of work. The Canadian Kapton solder stencil people have a special dissipative polyimide that they make their inspection stencils out of. Well, it's about the end of the day here so I think i'll go home and propose that double and a fresh viagra to the wife. Cheers! John Thorup

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Michael Parker

#6483

interchangeable stencil frame systems | 4 May, 2001

I recognized the spoof. Where the heck does he find those links anyway?

We only use the low static dissapative stuff around here.

But I have heard that Viagra promotes a blue tinge to eyesight. How come your seeing yellow?

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#6484

interchangeable stencil frame systems | 5 May, 2001

yeah, we use the low static stuff too... except when the purchasing assistant did the company a "favor" and sought out something cheaper. Those times you want a big stick! The color confusion is because of the rose colored glasses that I wear. John Thorup

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