stencil cleaning

"stencil cleaning" search results in the Electronics Forums

9815 result s found for "stencil cleaning" in the Electronics Forums

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Jetprint solder on PCB boards

May 27, 2010 | Ask yourself what advantage do you gain from a 200+K jet printer ? I'm thinking you could buy 1000+ stencils with 200K

Fine Pitch Printing Issues

May 25, 2010 | Yes, I use Indium Mesh 3. I have a re-cut stencil on the way. Thanks for the input!

Fine Pitch Printing Issues

May 20, 2010 | I believe industry standard is 1/2 pitch for fine pitch devices. If your part is 20 mil pitch, apts would be 10 mil wide. This should gasket fine to the pcb pad and with a 5 mil stencil should print well.

Solder void underneath the mosfet

Mar 25, 2010 | the voids will cause a long term relability problem as the part will not be correctly heatsinked. Change your stencil aperature to a "+" sign 15-20 mils wide in the center of the pad. ___________ : | : : | : :----|----: : | : :____|____: As the solder melts it will force

ZelFlex Z4P 558x558 Gerber

Feb 25, 2010 | Hi, would you please send me the gerber of Z4P stencil? We've bougth it some weeks ago, but unfortunatelly the file is missing. Thanks: Andras

QFN Rework

Feb 24, 2010 | Is it necessary, or beneficial to apply solder paste on the PCB pads for QFN rework? It seems that using micro stencils is not the best approach. Any guidelines or suggestions available for paste deposition techniques?

paste release

Feb 7, 2010 | The ratio of aperture opening area to aperture wall area is a critical evaluation measure for the release of the printed solder paste. The stencil thickness has the biggest impact on area ratio.

paste release

Feb 5, 2010 | Hi! i would like to have opinion about the solder paste release. is it better on a 5mil or 6 mil thickness stencil? thank you!

Stencil Printer?

Dec 1, 2009 | Have you considered a refurbished SMTech Benchmark printer from SigmaPrint?

Stencil Printer?

Nov 18, 2009 | Those all appear to be automatic. We don't need something that large and expensive. We just need s

Placement of 32 pin QFN w/t ground pad

Oct 16, 2009 | Use multiple small stencil openings [maybe 15 thou square or about the size of a signal pad], where total area approximately 50% of total thermal pad on the board. For more, search the fine SMTnet Archives => thermal and pad

MPM AP25 Problems

Oct 12, 2009 | When you teach the fid on the PCB and the camera then changes to stencil image, is it in close physical proximity to the feature/fid you wanted or do you have to move quite a bit?

Stencil thickness

Sep 28, 2009 | Search the fine SMTnet Archives to find threads like:

Glue "decouple"

Sep 24, 2009 | Both of the articles talk about pockets cut in the contact side of the stencil that correspond to components [or PTH leads] that would allow PTH first, glue second, and finally second-side SMT placement.

SMD Adhesives Gluing Process

Sep 24, 2009 | Can you pl let us know what was the ESD sensitivity level of your assembly? We are also using plastic stencil from last 3 years and not seeing any major diffficulties in our class-3 product.

Glue "decouple"

Sep 23, 2009 | Thanks to all for the great replies. I guess we'll buy a stencil for a few hundred bucks and try this. Anyway, nobody expressed an opinion about the "decoupled" glue dispensing. What do you think about this idea? Thanks again for your help. Best regards, Santiago

Glue "decouple"

Sep 21, 2009 | Anytime we use a glue/wave solder process we print the adhesive using a stencil and our screen printer and we have excelent results. It is in no way a difficult process.

screen blade length

Sep 8, 2009 | Important mainly for consistency of pressure across the entire board length... But also quite abusive of stencils to use longer blades. Especially since (most people) when using the longer blades will bump the pressure up even higher to minimise the pressure consistency effect.

SMT Stencil Printer upgrade worth the cost?

Aug 27, 2009 | We have reconditioned MPM / Speedline UP-400 Screen Printers available. These are full auto machines

Vapour phase soldering - problem

Aug 20, 2009 | reduce the stencil aperture to prevent tombstoning in vapor phase process. from my experience a 6 mil thick must be at least between 20 to 30 % aperture reduction for 0805's and below. cheers!

Electrically-Conductive Tapes application advice?

Jul 31, 2009 | If the sensor can survive the 200C in the molding machine, then could it not survive Pb-free soldering? Maybe not convection reflow, but it should be able to survive vapor-phase reflow. I would control solder height by controlling the amount of paste applied (stencil thickness).

DEK Stencil image offset?

Jul 25, 2009 | Why are you using front edge justification? We have never used anything but centre justification.

DEK Stencil image offset?

Jul 17, 2009 | > See attachment. Hope it is useful. DucHoang, Thanks for the info. This is exactly what I

Stencil Fiducial Repair

Jul 10, 2009 | If they are under filled fids, take heavy duty two part epoxy and mix it with carbon powder from you

0402 PARTS

Jul 1, 2009 | You can use regular paste and a .005 stencil will help reduce tombstones. It's just that easy. I run 0402's all the time without any problem, just make sure your profile is a good one!

0402 PARTS

Jul 1, 2009 | Hello All We are going to run our frist 0402 parts soon. do I need to go to .005 stencil or will .006 work ? do I need to use a type 4 paste ? pad design does a standard rectangle work or the round pads ? Thanks in advance for any replies.

Large Format Printers

May 26, 2009 | Hi, I don't think DEK do anything, but does anyone know of anyone who does any full automatic stencil printers? Grant

how to measure Adhesive strength

May 11, 2009 | Hi, I just want to know how to measure the strength of a 0603 after it's cured, we are using Heraeus PD944 with a 30-7 mils stencil, glue depositions looks well, but I don't know how to measure it? Thanks

0402 tombstones

Apr 17, 2009 | have you try to change the stencil apertures to another figure like the one that look like a baseball home? I was having that problem and some solder beads and with that I was able to decrease the tombstones

High complex board manufacturing

Mar 2, 2009 | Thanx for all your recomendations, we already ask for a 3D SPI and help us well, we are asking for a ultrasonic stencil cleaner. By the way how do you deal with the 'head in pillow' defects? is there a solder paste alloy / profile issue?

Solderability problem II

Jan 21, 2009 | Try a typical Stencil Cleaner with Glycol ether mix as probably solder resist residue depositing back onto the pads during levelling. Cheers Greg

What will happen if a sloder paste is used after 24hours

Jan 21, 2009 | Sorry if that sentence there was not really clear. I meant: don't to try to 'revive' old paste or paste that has been on the stencil for a very long time using fresh paste.

SOT23s and paste + glue

Dec 24, 2008 | Oh,I consider the process is wrong,it is stencil print paste-mount-reflow -apply glue-reflow,then wave solder. it must pass twice reflow,also the first reflow profile is different and the second .

manual stencil print 2 passes

Dec 23, 2008 | One thing that helps is to divide large pads into a series of smaller pads. This prevents the scoopi

Bottom side adheasive

Dec 9, 2008 | I have virtualy no experience with placing bottom side components. We have a new board coming that will have a few R's & C's bottom side. Can anyone give oppinion on dispensing glue dots vs. applying adheasive with a stencil ? thanks

Good Manual Printer for Large Boards

Dec 3, 2008 | They make manual printers that fit 29X29 inch stencils. We use one every day. It's an old Svecia model.

Stencil Cutters

Nov 24, 2008 | The Mydata machine is very cool. It is a bit slow but is perfect if you want to do small prototypes

Stencil Cutters

Nov 20, 2008 | And the labour involved is not just the machine operator. The data has to checked out, tweaked and

Stencil Cutters

Nov 20, 2008 | If your boss is willing to spend that kind of cash, check out the new MY500 from MyData. I rece

stencil to pcb manufacturing tolerance

Oct 31, 2008 | Hi Andrzej, Thank you for your suggestions. The Link which you referred is really informative.

Solder paste dispenser choice

Oct 23, 2008 | The area in question requires more than can be stenciled, and at 50K-100K units I can't imaging how many people I would have to hire to hand dispense the material.

Fill a stencil openings with what?!

Oct 9, 2008 | Yep, they are cut all the way through and you are correct, they do not stay in there very long. Then

Fill a stencil openings with what?!

Oct 8, 2008 | Steve hit it on the nose, use high temp kpton tape....we do the same thing. Cheaper.

Less solder with fine pitch qfp

Sep 29, 2008 | Let's narrow this down. Questions are: * Are you putting the proper amount of solder in the board with your stencil print process? * If you are putting the proper amount of solder in the board, where is the solder going? Pick one and then fill-in the blanks to bring us upto speed.

Large Area Stencil Printing

Sep 20, 2008 | Hi, Thanks for the info and I really appreciate it. I will contact the companies and see what we

Stencil Design

Sep 17, 2008 | Ray, 10x16 should give you .62 area ratio, Theoretical Solder Volume=800. You should increase th

DEK PumpPrint - Any users?

Aug 22, 2008 | DEK has it listed on their literature as an application for the stencil technology, although most of the discussion is for adhesive. Thanks for the feedback.

DEK PumpPrint - Any users?

Aug 22, 2008 | Mike, I do not believe the PumpPrint stencils are use for applying paste. We used them for applying adhesive on a particular PCB that required tall dots for larger components. We use the ProFlow system exclusively for paste and adhesive applications. We like it.

SMT Adhesive

Jul 24, 2008 | I use loctite 3616 chipbonder for stencil printing and have good results. If using with a shot meter Loctite 3621 has also produced good results.

Dek Horizon

Jul 22, 2008 | Presuming this is the braided cable for the Adjustable Stencil mount on Horizon, etc. 177055

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