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May 20, 2016 | Hi All I have a need to calculate the Aperture area in a stencil with in a very short time without going in to a CAD viewer. I need that when I insert solder paste file in to a certain software application and that application software calculate the area of each Aperture in the stencil and output a
Jan 27, 2016 | You can buy an awful lot of stencils for 200K. Unless you are running "special case" products I'm not sure how the cost can be justified. We get our stencils next day with no added charge. The MY600 must use specified paste chemistries that are not offered by everyone. In addition you cannot jet
Jan 20, 2016 | We are looking at getting a Mycronic MY600 jet printer or an auto stencil printer. We do low volume, high mix, fast turnaround assembly. Can anyone share their experience with the MY600? Is there any competitors to the MY600 on the market? I'd appreciate your opinions on the jet printer vs . stencil printer but please no sales pitches. Thank you in advance.
Apr 5, 2015 | Alpha tetra bond stencils vs Vigon SC200 After washing a tetra bond stencil at PBT machine (Vigon SC200, 50 deg Celsius by 20 minutes) some signs of glue degradation were seen. Does anybody have an experience washing tetra bond in Vigon? What temperature regime is preferable? Thanks
Jan 20, 2015 | Stencil lead contamination test There are a lot of lead testers out there. Just google it. I personally don't think you will find anything wrong, but for the pleasure of your customers buy one and prove it. I would also check the lead on the squeegees of your stencil printers and the lead levels in the reflow oven as well.
Nov 5, 2014 | Hi Bill, Contact Steve Yen with USA STENCILS INC. He'll help you out. He might need to know stencil thickness and type of solder paste, his contact as below. Steve@usastencils.com 714-636-6211
Jun 12, 2014 | What you need here is a double print process. You should have 5mil stencil for SMT followed by a 10-15mil stencil for TH. I don't know what quantities you are running or do you have the capability to add another printer in the line, but that would be your best choice. These joints don't look good
Mar 7, 2014 | Kapton Stencils for Prototyping We have used the Stencilquik™ BGA Stencils from the same supplier to attach some LGA's for a prototype run. We were able to get a few different thicknesses to see which worked best. They worked very well for that limited application. We did not try anything else. Jerry Dengler
Oct 14, 2013 | Yes, I agree with Evtimov. It's more about aperature reduction and type than it is the type of machine. Aspect and and Area Ratio are very important. Take a look at this page I found on the internet http://www.qualiecocircuits.co.nz/stencil-technology-other-aspects.htm
Mar 15, 2013 | We will try both the solder mask and the .001" Kapton and see where we end up with each. This is a fine pitch dual row QFN and we cannot afford too much paste on the .004" stencil we are using. We have experienced shorting in the past with .005" stencil. Thank you for the fine "Brain Work
Dec 3, 2012 | Well there are 2 ways to go about this, the first would be to have your stencil provider do the calculations for you (with his software) or you can purchase LPKF CIRCUITCAM EDIT from LPKF. This is a Gerber editing software that is designed to make stencil files for laser cutting
Nov 14, 2012 | Sent: Wed, 14 Nov 2012 08:23:03 -0500 Subject: RE: SMTnet Forum: Question About Blackstone Stencil Cleaner, CH-2408 Dave, This E mail is to confirm that the Stencil Cleaner Model CH-2408, manufactured by Blackstone-NEY Ultrasonics, does not require calibration. Best regards, Richard L. Thies
Jul 5, 2012 | What size frame are you using and what thickness and size is your stencil. I would ask your stencil vendor for their positional accuracy over 20-36 inches x-y. We have the capability also to make a photoplot in a controlled environment and over lay it on the board to see if it matches the gerber
Jul 2, 2012 | Thanks for you inputs guys. We left our customer know about the design issues, they will add fids on the next version, I hope it helps. meanwhile we'll deal with those issues. I tested a new stencil today and It has a better alignment than the older one but it still is misaligned. How can you make a stencil starting from the PCB to make it match, is the PCB scanned or something?
Jul 2, 2012 | using fids instead of pads I agree would be more accurate. However if the board and stencil do not register then nothing will align. We have started to fo many stencil to board matching due to board distortion either before or during production. We also recommend a slight apperture shrinkage just
Mar 9, 2012 | Is your solder paste deposit drying out? Or if the paste deposit is small or there is insufficient paste then the tack between the device and paste will be poor so it can easily come out of the paste during its placement or placement of other parts. Check the stencil aperture and stencil thickness
Jul 22, 2011 | It's actually a "silane" according to the same article. Also, it "bonds" with the surface of the stencil. once bonded, it's not going anywhere. I'm not a chemist. I'm not promoting this product to be used on stencil. I'm just pointing out that what is sold as Nano coating for $300/10 pak may just
Jul 6, 2011 | Hello Can someone recommend a cost effective solder printer that does not require stencils. We are currently using a Speed Print 200 machine but this requires us to spend a lot of money on stencils and wait long lead times for these to be manufactured due to our high mix low volume demand. Can
Mar 8, 2011 | I have an issue with PLCC Insufficient Heel solder joint fillet.The aperture dimension is : 30 x 100 mils on PCB & on stencil also(1:1 per gerber).Rohs Process. My stencil thickness is 5mils due to presence of Tssop & QFP package & i cannot increase thickness to improve solder volume. Please throw
Jun 8, 2010 | Hi Vee, I thank you very much for the reply,and yes everything is ROHS. I am reading over the manual and looking at the differences between them. I also have a questions for you regarding stencils for BGA and other types of packages. Do you know any provider out there that does those online , or what material do you think is reasonable to use for stencils.
Mar 8, 2010 | Stencil Printing We have been using a manual printer for both epoxy and solder paste.Now, our buyer asked us to replace it with 2nd hand SMT SL 2220 stencil printer.Our board size is usually 450x550mm and thousnds of compenents.I want to know that some1 has used this printer for epoxy before and what problems has
Nov 24, 2009 | You can order the glue stencil at http://www.usastencils.com They can design the opening of the apertures on the stencil in the middle of the caps so you can screen an adhesives through the opening then you will have it right
Nov 24, 2009 | You can can contact USA Stencil, Inc. at http://www.usastencils.com They are laser cut the solder paste stencils for you and help you learn to create XY CAD Data for your pick and place machine.
Oct 23, 2009 | FOR YOUR NEXT RUN CONTACT STEVE @ USA STENCILS INC, HE WILL MAKE ONE SAMPLE FOR YOU - THEIR TEAM HAVE SOLID EXPERIENCE IN STENCIL DESIGN ESPECIALLY PCB WITH CRITICAL COMPONENT. HIS EMAIL IS STEVE@USASTENCILS.COM GOOD LUCK!
Sep 27, 2009 | Stencil thickness The same issue i faced 2 yrs before , i sugest 1. Use stencil of 4 mils ( Take care of Aspect Ratio and Area Ratio ). 2. Use Solder Paste of Type 4.5 and Viscosity in between 1100 to 1300. ( Try Solder Paste of Cookson or Alpha metals : OM338 T45-LF and OM6106 leaded ) This defibately helps u.
Sep 23, 2009 | I did see ESD issues years ago when we tried using a plastic stencil to print SMT glue. We measured a huge charge on boards indexed out of the printer. I tried ionizing fans but that didn't help. We now only use metal stencils for printing adhesives.
Sep 3, 2009 | Yes, it is important to ensure blade pressure over stencil is uniformly distributed across the entire length of blade. Such is possible only if the stencil is firmly supported from below, which during printing is done by the presence of the PCB itself. Beyond PCB dimension there exists no support
Aug 27, 2009 | SMT Stencil Printer upgrade worth the cost? We have an inline MPM 25 HiE with 2D inspection. We are needing to put in a 2nd line. We have ordered another identical used stencil printer but are wondering if we should upgrade to a newer machine with 3D inspection, automated paste, etc. Will we see an improvement in performance that would
Feb 5, 2009 | Stencil design (maybe old) question... Hi Manuel, most passives are chip components. These tend to self-center/align during the reflow process. However, you need to ensure that there is a uniform balanced solder paste deposit. I had tried few such ovals in earlier stencil designs and results were satisfactory. The more serious issue
Nov 20, 2008 | Stencil Cutters "Jeez, how do people like this make it to power?" lol...there goes Hussman, saying what everyone else is thinking. I do like robgd3's line of thinking. If you want to spend money, why not spend it on a machine that replaces* stencils instead of one that makes them? *if, in fact that's what they
Oct 5, 2008 | Fill a stencil openings with what?! Hi All! I remember reading and seeing some (maybe Loctite) product which could be used to fill stencil apertures, but now when I need one, I cannot find it. Or anything like. Can some one please guide me? And with filling I mean permanent filling, no need to remove or re-open apertute again
Jul 18, 2008 | I think Real Chunks has your answer home plat or reverse home plate or like we use a 10% reduction on most aptures vs pad I think your problem is to much paste on the pads we used to see a lot of that with 8mil stencil thicknes on our 1206 caps went to 6 mil stencil 10% reduction fixed it for us
May 9, 2008 | Ekra Stencil Printer Looking to purchase a new, inline stencil printer. I have been told that the new Ekra printers are based on the DEK platform, but do not carry the DEK price tag. We are currently running old SMT table top clamshell printers, so any inline sytem will be a giant leap forward. Looking
May 5, 2008 | We use double image stencils with our DEK Horizons. My operators would just load the pcb on to the rials and manually adjust the stencil and clamp it. Once they do that they add into the comments what number the handcrank adjustable is at so next time it is ran they have it. Hopefully this sheds a
Feb 20, 2008 | Inspecting a new stencil Reading the original post.. Floyd, do you remember the old overhead projectors back before we had the new fancy video projectors? Just get a clear sheet of that plastic and print your outline on that. Put that sheet over the stencil and presto, you can see the ones that got missed.
Jan 19, 2008 | Stencil Storage Solutions Check stanley supply and techni tool. They have rack with no doors but you could prob fab something up. 8020 stuff isnt cheap either. I bet it would cost about 400+ to build a stencil rack plus all the labor and thinking involved. That being said, I love to use extruded alum kits for everything
Jan 18, 2008 | Stencil Storage Solutions Try asking your stencil supplier. One of mine recently gave me a sales pitch for something like you want. If you are mechanically adept and enjoyed Lincoln Logs, Erector Sets, Lego's, Panels and Girders toys then look at 8020.net. Extruded aluminum tubing, bolts, locknuts, etc. Build one yourself
Dec 18, 2007 | In addition to what frank said, I have also just placed the board on the work bench, but instead of trying to hold the board and stencil in place I would make a frame for the board using double sided tape, and after aligning I would tape the far edge of the stencil so that it would align
Nov 30, 2007 | BTW, Option 6. Bear in mind though, In the stencil printer if you run into a problem like this, it will not work with the holes...Only what's in the stencil... We have under some rare circumstances used 1-2 pad's on opposite corners and on very large component pads/apertures for this to work
Nov 26, 2007 | currently i'm open my stencil aperture is 80% from the land pattern. is this will cause insufficient solder at the terminal component or not? the stencil thichness is 6mil and the board run using SMT pallet which i consider there will be no option for warpage. since you're rarely see
Nov 9, 2007 | We have started using QFN packages in large volume and are having problems with no-solders. We are using 6mil stencil with 1x1 paste print to pad. These also have thermal pads with thru vias that we reduce the stencil aperture by 1/4. Board also has BGA's, SMD connectors, inductors many large
Oct 28, 2007 | With a 7 thou stencil, we'd go 1 to 1. So for a more typical 6 thou stencil, we'd bump the aperture area by 1.15, maybe 1.2. We make no distinctions between 'innies' and 'outies'. Are you talking about castellations on land grid devices [ie, BCC�, LGA, QFN, MicroLeadFrame�, etc]? If so, we'd go 1
Sep 3, 2007 | A suggestion for your stencil which works is as follows. Cut your stencil aperatures beyond your pads to a length of 0.1mm , this then allows the paste to pull back into the pad creating a blob of solder which can be inspected by AOI.Best length and width of pads for a QFN 56 and 64 is 0.8mm by 0
Aug 14, 2007 | I see...said the blind man. If you've got the LED's on one side, and the SMT on the other...and you have the clearance, I'd go with the previous suggestion of gluing the SMT, and waving the whole assembly... As for stenciling....use a glue dispenser, rather than stenciling the glue on... ..rob
Aug 14, 2007 | standard procedure for this would be to solder SMDs on the bottom side and the LEDs all at once on the wave - if the layout is ok for the wave. You would have to glue the SMD components, for this you would have to use a glue dispenser or a special higher stencil for the printer with space on the bottom side of the stencil for the LED pins. Hope that helps, Erhard
Jun 23, 2007 | Hi, We use 1:1 for 1 mm BGA and it works fine. We used it at 4 thou laser cut stencils when we had a manual stencil printer, but have moved to 5 thou with the DEK and it works ok. We originally went to 4 thou because of paste release, but the DEK releases better without shear forces, so we can
May 22, 2007 | I would consider calling Kester and telling them they need to send their people out. I could not really see mesh size being an issue on anything 20mil and above. There are several other issues that can cause aperture clogging as well...: Incorrect stencil aperture design. (The area and aspect ratio must be correct.) Stencil seperation speed Underside board support Temperature and humidity Squeegee pressure ....to name a few.
Apr 24, 2007 | If the PCB you are using is a HASL pad finish and is a leaded assembly, we use homeplate pads with a 5 mil stencil. If the circuit has Enig finish and is PB-Free then we use 1:1 apertures with a 5 mil stencil Either method should provide no solderballs and good fillets for 0402 passives. Good
Mar 8, 2007 | Stencil design Stencil Thickness should be .005" A reduction along with cross hatching is a must for the center pad to reduce paste volume as well as to assure even paste deposit while printing on a large pad. With out the cross hatch, the squeegie will most likely pull paste away from the center of the large
Mar 2, 2007 | Stencil design 1- Thickness 0.005" 2- I usually reduce 50% of the thermal pad, but it also depend on original size of thermal pad somehow I have to either create window panel or crosshatch otherwise component wil get wimming during reflow. Hope this will help. Regards Steve Yen USA STENCILS
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