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Jul 14, 2015 | and lines). Depends on the programmers you can get a quite nice system. I have seen it work. It had traceability even on the stencils, solder paste lots and the squegees. On itac this can cost you a fortune. You can contact me if you want some more information.
Jun 5, 2015 | I've been running an eval on it for a little while now. Most impressive thing I've seen so far: Dispensed 100 grams on stencil, printed two solder paste eval PCBs and reflowed, put paste onto sheet of FR4 and let it sit out in the shop next to the printer until the same time the next day when I
Jun 2, 2015 | 've known this to cause problems elsewhere. Does anyone else have any ideas? Should this issue be tackled at the PCB design level or the stencil edit level?
Apr 13, 2015 | > Juki GL-1.... Any thoughts? I'm New to the > industry and I'm trying to buy a new screen > printer. I have two in mind, DEK and Juki. Up front qualifier, I'm the EKRA Rep for the southeastern US. I have been involved with stencil printers for about 30 years. Juki is selling the GKG
Feb 13, 2015 | Yes, Kester it's a very good brand in solder materials. I use Kester solder paste and cored wire 10
Feb 11, 2015 | I do a lot of prototyping, but I also do production boards. I produce 2000-5000 boards a month for a
Dec 3, 2014 | We have a smt connector on side one of our pcb that overhangs through the board to the second side.
Nov 14, 2014 | Need some help, i'm just new with design and I need to know what software is out there that can answer all my question: able to generate/create correct stencil aperture; Can modify/ edit or redesign the main file(ODB++, Gerber, etc); Can generate centroid data from Gerber,CAD, etc. ;Can compare 2
Sep 8, 2014 | I'm about to start a project to install some controls on our tooling for production, such, stencil, fixtures, feeders, press-fit tools, WS pallets, etc... How do you deal with that? I know there are some software solutions that may work, but what actually do you use? we have about 700 feeders (3
Aug 5, 2014 | SFC and PhilC To answer one open question, and I too have difficulty with little stencils and preforms..... If you can manage, try dipping your balls in paste. It adds the right amount of flux and a bit of metal as well. We have a nice Rework Station for this duty, but if you are clever, you
Jul 31, 2014 | Our company occasionally has the need to rework BGA's, and we currently do this a rather long-winded way, using the stencil to paste the BGA, and then placing by hand. Sometimes we have to use an IR machine to re-flow the part, and at other times, we can put it through the oven again. However
Jul 28, 2014 | Hi Everybody, I have an Ekra E5 and I have two problems. - Anybody have english operator/service manual to this machine? - I have problems with understencil cleaner dispenser. If I start to flow the stencil cleaner then the dispenser doen't move or move with intermittent motion. I changed
May 12, 2014 | the solder sticks more to the PCB than to the leads of the component? some of the pads are probably bigger than they should be(more paste on these apertures), but at this point I don't want to recut 20 stencils. Any thoughts are appreciated. Process is leaded.
Jan 14, 2014 | I don't know. What does your paste supplier say? You can run tests * That you used to qualify this paste in the first place. * According to IPC J-STD-005A Requirements for Soldering Pastes * Using your toughest stencil to print this paste on a bare copper board, reflowing the board
Dec 18, 2013 | maintenance. The reduced space requirements of a frame-less solution are invaluable and it means you can keep older stencils "just in case" without resenting the space they take up. Alpha also have the TetraBond system where the foil retains some protection with a very basic edging that protects it and you.
Dec 12, 2013 | Vector guard is ok. Advantage is the space you save on stencils. We have 6 frames - I had to repair some of them through the years of usage - basically some of the tubes inside warn out and have to be replaced. Of courcce they have some mechanical life too - I think this will be over 7-8 years
Nov 13, 2013 | . If alignment is important you should pay special attention to your layout to keep it thermally balanced, never rely on self correction. Also your manufacturer will pay close attention to stencil design and pasting parameters/accuracy.
Oct 11, 2013 | > In your experience, what is the most popular CAD > package in use today? > > Also, does anyone have > an automated and/or quick way of counting the > solder points on an assembly based on either > gerbers or CAD data? We use GCPrevue to view gerbers for stencils
Jul 29, 2013 | Greetings! TWS Automation has the perfect machine for your needs. The Quadra DVC is an inexpensive, vision system centered, 0201 capable, Pick & Place machine with 3300 cph max speed. A complete line, including a TWS Automation Stencil Printer and Reflow Oven can easily fit in your budget. VB
Jul 22, 2013 | the stencil process have to be altered i.e. larger apertures etc ? what types of pcb materials can handle the higher reflow temps ? we currently run older 5 zone convection reflow ovens are these suitable ? they can go upto the reflow temps required afaik. any info on the processes would be much appreciated :)
Jun 17, 2013 | My circuit board contains 11 x 11 matrix 1mm pitch BGA, The device was tested in socket on evaluation Board. We handed over the actual PCB & devices for re-flow. The assembly house first re-flowed all the SMT components other than BGA. BGA was placed after first re-flow, Micro stencil was used
May 31, 2013 | that device to the right, a good amount of the paste will do the same. How is this group of pads cut on the stencil? Also what is this PCB finish?
May 18, 2013 | pop a couple of the QFN off the board using a beer can opener and check the coverage on the board and the component ... I'd guess that you have plenty of solder. People talk about reducing stencil coverage of the thermal pad by 50%. [Read papers in the link I provided in an earlier post on this thread
Mar 18, 2013 | chemically bonded processes use a colored dye so you can see when the coating begins to fail. Claims of 80K + prints were made. Another point: your solder paste roll potentially no longer "rolls"...it skids across the stencil because of the lack of friction. My guess is that you won't be hearing about
Feb 4, 2013 | on the DEK : - Loading a program - change squeegees - calibrate squeegees height - paste load - change stencil - how to do home on the print carriage ( we use a lot of different support plates for different models) just the basic stuff to make the machine work
Jan 30, 2013 | In response to hegemon... This is not a recommended practice but..... We have added a few drops of water soluble flux to our water soluble solder paste when the paste is on the stencil. This was after the paste had "dried" out a bit. We have had good results but the key is to not add too much
Jan 9, 2013 | are going forward with these, you have to pay CLOSE attention to your Stencil alignment when printing, and the component alignment after placement,and that will give you the best chance at success. Good Luck!
Dec 1, 2012 | Hi, We are starting a small SMT assembly line for batch production. Following equipment has been finalized. 1) APS Novastar Reflow oven > GF-B-HT 2) ELPRO Manual Pick and place > MAN32 + vision system 3) Ren Thang Manual Stencil printer > STP550 Can anyone quote the best price for the above? We
Sep 22, 2012 | You don't say which 265; presumbly since you say "bulb" it is either MK1 or GS with shuttered camera. Both those machines have potentiometers to control light levels. MK1 is on machine frame inside drop down (stencil load) door, near serial tag. GS is on far right side with front top cover lifted
Aug 23, 2012 | sure that the stencil is being clamped tightly. I'm sure there are some other culprits you could check, but this is just what comes to mind for me. -Phil
Aug 10, 2012 | Anyone have experience printing solder paste for a Toshiba SSM3K15CT(TPL3) FET with CST3 package? Using 1 to 1 rectangular apertures with a 4 mil stencil and Alpha OM 338 #4 powder size lead free solder paste. Print head speed is 15 mm/sec and solvent wiping every 2 panels. Still having problems
Aug 2, 2012 | spent on the stencil. I have. however read that the fresh solder should be brought to room temperature before opening to prevent moisture gathering on it. What are peoples views on this? What differing control procedures are there? We use both lead and lead free solder paste.
Jul 5, 2012 | It is very possible We do have lasers designed to cut upto 7feet long. However they are mainly backplanes.I would think this could be your issue although I still think them having the board would help. I am not sure where you are situated. If you wish us to cut a stencil for you free for your
Jul 2, 2012 | I disagree with the statement that using pads as fiducials shouldn't be a problem. If he's using pads on the PCB, than he is most likely using corresponding apertures on the stencil. During production, these apertures will start to have paste accumulate around the edges. This may very well throw
May 23, 2012 | Pick and place is not my area but I did have a customer a while ago with a similar problem. He did try different nozzles and air pressure. They use Nano protek on thier stencils. He wiped the nozzles with Nano Protek and the problem dissappeared. Only a suggestion. nano is similar to Teflon
May 21, 2012 | We are using Ekra Stencil printers and they are great except for 1 problem... We run several different boards a day and we need a way for the operators to place the pin supports in the same postions on the second side of the board everytime a board is ran be it a week or a year after the first run
May 11, 2012 | Hi Guys, I need some help. I was running prototyping volume previous and my SMT line uses manual pr
May 10, 2012 | paste with the new paste on the stencil. You have SOT23s tombstoning!!! Most unusual. Usually, tombstoning is caused by some kind of imbalance. * Uneven heating * Pads spaced too far apart * Different amounts of paste ... that kind of things So, a common first step in troubleshooting tombstoning
May 7, 2012 | Hi, I need one clarification about solder paste printing height tolerance. How to define and fix the solder paste height tolerance after screen printing for inspection purpose. Currently we are using 5mils thickness of stencil, in that we are gave tolerance as 4 to 7mils. Please help to provide
Apr 30, 2012 | Pure Tin terminations can be mitigated for components with solder terminations less than .030" in height from the PCB, by using 6 mil stencil with Sn63/pb37 solder paste. That's the simple story for our customers that require it. Beyond that height we either have the components solder dipped
Apr 9, 2012 | I forgot to add that we are using a 3 mil stencil. It seems like to me that may be there isn't enough flux left when we reach liquidous?? About half of the solder spheres do melt and wet on each pad, but the top half of each solder joint is just the solder spheres that will brush off easily. I
Mar 14, 2012 | We need to develop a method of putting solder paste on a stencil then putting the unused part back into the refrig. Reason we are thinking of this method is because we only run circuit boards twice a week. I dont want to waste entire jar of paste because we have 14 days once open. Can I do
Jan 25, 2012 | A few years ago a lot of stencils were 6 mill and 7 mills and a lot of people still use them. these days with such a hi mix on the boards 5 mill seems to be a good compromise. if the 6 mills is working for you that's fine. One thing to note as you go up on thickness 402 and 603s will get globee
Sep 22, 2011 | as possible to the the original SMT setup in order to maintain. In those instances a mini stencil was the ticket. I also experimented at the time with solder paste dipping, which provided good results, though still not as much metal (and standoff height) as an SMT produced joint. Regards `Hege
Apr 20, 2011 | Hi. I have looked on Essemtec but not asked for a quote. I've always tough they where over my budget
Apr 18, 2011 | Hello Jebs we started out that way but the more handaling of the pcb the more problems you will h
Apr 15, 2011 | Hello all lets see you are wanting to place 60,000 parts a day make sure you derate the machines
Mar 31, 2011 | in the past, and did not change our reflow profile, stencil, paste, etc, or any other parameter other than board source. Any suggestions on what could be causing the problem and how to fix it (other than just not ordering from the new pcb source again)? Thanks, TK
Mar 22, 2011 | produce products very similiar to these minus the QFN's. Could it be the stencil? I don't know. I am at a loss. Any help would be great. Thanks
Mar 21, 2011 | line, the variation between pallet tollerence, stencil and device tollerence is a factor. Any ideas on preventing sodler balls? Has anyone experience with Ceramic/reflow profile.
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