Order by: Relevancy | Date
Nov 19, 2009 | Thanks dave, We have our problem down to the stencil (printer). We are unaware of any design rules concerning aperatures on glue stencils, does anyone know of any?
Nov 11, 2009 | Stencil Printer? What does anyone recommend for a good manual stencil printer as well? This will be used for low volume production. Thanks! Ryan
Aug 20, 2009 | When I've seen white strands in the solder on SMT boards, it's been fibers from stencil wipes that stuck to the stencil, then transfered to the board when it was printed. I'm not sure why this would only happen with fine pitch components though.
Jul 24, 2009 | DEK Stencil image offset? I use Center Edge, and adjust stencil offset. It's very easy, you just have to give it the PCBs width. An other advantage is that If your PCB has scrap strips, and you lose them, or PCB changes, you can print it anyway.
Jul 17, 2009 | DEK Stencil image offset? thanh, It has a pullrod. I will order the stencil as you suggested, center and I'll just offset it with the pullrod. Thanks for your input!
Jun 3, 2009 | Stencil Design Try Fineline Stencils, they help us all the time. They are the experts at what they do, they will help you with stncil thinkness, app sizes and the ratios needed for a great print.
Nov 20, 2008 | Stencil Cutters Don't forget the value of being able to blame everything from bridging, solder balls,tombstoneing , traffic jams, the price of gas, the demise of the american auto industry and everything else on your stencil supplier. That would now be you!
Nov 20, 2008 | Stencil Cutters The process materials alone will cost you more than a half dozen stencils. Not to mention the labor involved. Then the cost of all the equipment involved? Jeez, how do people like this make it to power?
Nov 19, 2008 | Stencil Cutters You should set up a tour of a respectable stencil manufacturer and take your boss with you. My guess is it'll change his tune immediately.
Nov 19, 2008 | Stencil Cutters Hi, we are a low volume high mix contract shop. My boss wants me to investigate getting the necessary equipment to make our own stencils. Would anyone know a good source for this type of equipment? Or any thoughts about getting into this process. Thanks.
Oct 9, 2008 | Fill a stencil openings with what?! We use campton tape also but we use a ultasonic stencil cleaner and the tape will come off everytime its washed good luck
Sep 16, 2008 | Stencil Design 10x16 by 5 mil stencil gives me a area ratio of .615 unless I am calculating incorrectly. I will try and attach some images tomorrow. By reducing the Y direction my area ratio s below .6 and I thought this was not advisable. Your help is muc appreciated. Ray
Sep 9, 2008 | We get our component stencil for this type of rework from Mini-Micro Stencils. We use a Air-Vac rework station and we have no issues at all.
Jul 15, 2008 | I would like to get a good stencil printer that fit the full size 29" stencil frame.. either used or new .. Any suggestion? Thanks in advance.
Apr 12, 2008 | Used automatic stencil print recommendations Good Point. Also, what about the type of solder paste your using - Are you getting a good release from the stencil? What do your boards look like after you print?
Apr 11, 2008 | stencil apertures for BGA Hi Andrzej, We are using for BGA (0.8 pitch) square apertures size 0.4 mm (rounded corners r = t) and stencil thickness t=5 mils. So area ration-> w/4t=0.8 Regards Jan
Feb 18, 2008 | Inspecting a new stencil Why not just print a board? You have a spare board for your profile right? When you are done you have a working program and you know if the stencil is correct.
Feb 14, 2008 | Stencil Design Question Don't worry about the paste print. Just omit it from the stencil. Mask over all the SMT components after reflow with water washable WSOL masking. Then run it thru the wave to deposit the solder. Then wash to remove masking. Or you could manually run it over a solder pot.
Jan 25, 2008 | Stencil Storage Solutions try AGI Corp at http://www.AGIcorp.com, the stencil storage racks are in stock.
Jan 18, 2008 | Stencil Storage Solutions Bliss is not exactly cheap, I will conceed that. I assume you are using framed stencils? Switch to QTS frames and buy the foils. You will save enoguh to buy a Mig welder and make your own storage cart!
Dec 26, 2007 | I am looking for suggestion of BGA 0.5mm pitch Ball 0.3mm (BGA 8x8mm)assembly and soldering. Stencil thickness? Stencil reduce? Etc.
Dec 19, 2007 | Stencil Printing: Single pass vs. Double pass Double pass printing for solder paste is not needed and will cause defects. Redesign your stencil thickness or aperture sizes, change your paste mesh size or type, go to 45 degree blades.
Oct 23, 2007 | Who is your stencil vendor? I've used three different vendors for Pb-free green frame stencils and NONE of them charged extra.
Jun 27, 2007 | Stencil Thickness 5 mil will treat you just fine. Do some research on stencil area ratio and aspect ratio if you ever reduce your aperture sizes any further.
Jun 18, 2007 | Stencil Thickness 5mil should work fine. Some stencil manufacturers charge more if you go less than 5mil so stick with 5mil.
Jun 18, 2007 | Stencil Thickness Good morning, 5mil stencil or less would be appropriate. We deal with 0402's daily and 5mil works. BR, Pavel
May 21, 2007 | Does anyone know where i can purchase a frame/stencil adapter for the MPM manual stenciler in Ohio? Preferably a air adapter. And also spare parts? Thank you for your help.
Apr 9, 2007 | Hi Chris, So you run eror free for 2 years, then change stencil aps and get problems. Why would you go smaller? Try using your old stencil with your no-lead.
Apr 4, 2007 | We reball hundreds of BGAs a week with the RB-2000 kit from Mini Micro Stencil, Inc. The reball stencils are made of stainless steel and can be used over and over again. We have reballed .5mm pitch parts with .012" balls up to 2400 ball BGAs.
Mar 29, 2007 | PCB land to part land ratio - 1:1 Stencil aperture size - 1:1 with PCB land Stencil aperture shape - same as PCB land
Mar 21, 2007 | The biggest problem with double printing is that if the squeegee pressure and speed are correct, the stencil apertures are already filled with paste. Printing again can force paste between the bottom of the stencil and the top of the board creating a greater potential for bridging and solder
Mar 15, 2007 | Invar Stencils Just finished using my first Invar stencil. Gotta say I was very reluctant at first but my stencil vendor convinced me to give it a shot. I have to admit that I am pretty impressed. I would have normally used an electroformed stencil for the prototype job I was working but the Invar performed just as well. Another plus is that the Invar stencil was onlt $25 more than one of my SS stencils. Thinking I might just buy the Invar for pretty much everything here on out. The real test will be on a PWA that is currently in layout. It will hit our SMT line within the next two weeks. I will update
Feb 16, 2007 | Stencil Fiducials Probably because you are using baords, as you quoted above. "Your DEK could read non-blackened fids? Wow, you must have bought them from Superman. Or did you just teach baord pads and stencil openings?" In my DEKs, we use the new fangled "Boards".
Feb 15, 2007 | Stencil Fiducials The E5s I had just needed the fids to be burned black. Never needed epoxy, although we did have one stencil that we had to touch up with a sharpie now and then because they didn't burn it dark enough (too hot...?).
Feb 15, 2007 | Stencil Fiducials Your DEK could read non-blackened fids? Wow, you must have bought them from Superman. Or did you just teach baord pads and stencil openings?
Feb 8, 2007 | RoHS BGA stencil question We use 1 to 1 aperture on a 6 mil stencil, no problems. Do not over print unless your board resist allows you too.
Jan 23, 2007 | US cleaner vs meshed stencil We had that problem when our stencil supplier changed epoxies to a more environmentally friendly chemistry. Reducing the temp. in the cleaner solved the problem.
Jan 22, 2007 | Pump Stencil Volume req'd for pih is 2.2 x the hole volume after lead has been inserted. Stencils work quite well in PIH applications too if you can make aperture large enough. Slow squeegee speeds also aid in filling hole with paste. Russ
Nov 29, 2006 | I have used a 10% area reduction with home plates on 6 mil stencils with good success. If you're using 5 mil stencils you might go with 0 or 5% reduction.
Oct 23, 2006 | Look what I found - is this stencil printer a known product? No doubt. Now they post and wait an hour and then advertise. Everyone should answer "We had one of their stencil printers and it was the worst."
Oct 3, 2006 | I've cut component patterns out of old stencils. Not as good as buying a new mini stencil but still it worked. I guess you can't buy those pre-pasted boards? I've never tried them but they look interesting.
Oct 3, 2006 | I agree with Steve on this. If you just order the stencil you would probably save more money than have to fix the boards if you were to do it manually. Most stencil houses for new accounts will let you get a free sample screen as an evaluation.
Aug 3, 2006 | Ekra Stencil Printer Can anyone comment on the pro's and con's of Ekra's E5-36 stencil printer? Has there been an industry review written for this particular model?
Jul 31, 2006 | Can UP 2000 printer work with R and L justified stencils? Does any one know how far left or right from center the aperatures can be? If I had a 6" board, and a stencil with cut-outs for both sides right and left of center, would I have problems?
Jul 27, 2006 | Stencil cleaners. Yes I do know what stencils are. We have many here and use them for glue and paste. You can stand on them, trust me.
Jul 26, 2006 | Stencil cleaners. Acually, Dr. Shocker, DaveF is correct. The high power spray can bend the metal between the aperatures on fine pitch parts. I'm sure it's not common, but I have seen this happen. I have not, however, stood on any stencils. Sounds like fun.
Jul 26, 2006 | Stencil cleaners. I enjoyed that little exchange between the presidents! It sounds like the guy from the ultrasonic company is more interested in selling his chemistry versus selling a stencil cleaner. The other guy had a little of the sneaky salesman talk but seemed a little more impartial.
Jun 15, 2006 | Dependig on your process. If you use the same Gerber data that made the board to make your stencil, by a reutable stencil manufacturer, then no you should not have any mismatch issues.
Jun 15, 2006 | How are your experiences with stencilling 0201 components on large circuit boards, i.e. 400 * 250 mm ? Will there not be too much mismatch between between stencil and (FR4) boards? If so, would dispensing be a solution? Any other solutions?
May 11, 2006 | Good morning, Russ is right. Mounted on frame stencil only may be used in both machines (stencil frame is standard). All other tooling is different. BR, Pavel.
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