Electronics Forum: stencil (Page 203 of 540)

screen blade length

Electronics Forum | Thu Sep 03 01:14:40 EDT 2009 | sachu_70

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 itsel

SMD Adhesives Gluing Process

Electronics Forum | Wed Sep 23 10:48:39 EDT 2009 | scottp

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 adhesiv

Stencil thickness

Electronics Forum | Sun Sep 27 22:39:55 EDT 2009 | rajeshwara

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-L

Stencil Printing

Electronics Forum | Mon Mar 08 21:53:48 EST 2010 | aungthura

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

Reflow Oven

Electronics Forum | Tue Jun 08 19:13:03 EDT 2010 | vmorina

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

I need some clarification on washing boards that are no clean

Electronics Forum | Tue Nov 02 08:36:51 EDT 2010 | rgduval

Michelle, Our experience with no-clean solder pastes has been that water washing a mis-print is a bad idea. We've found that DI water does not do a sufficient job removing the no-clean paste (the same goes for stencils). Instead, we have washed no

Using an air hose to clean stencils

Electronics Forum | Thu Nov 04 14:48:48 EDT 2010 | spitkis2

You got my vote. I would not want to be on the other side of that stencil. Maybe your operators are just trying to save the company some money by collecting the excess solder paste and resuing it for future builds? I hope there are no bean count

PLCC Solder fillet NG

Electronics Forum | Tue Mar 08 02:28:03 EST 2011 | nagesh

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

Stencil Inspection

Electronics Forum | Mon Mar 21 15:37:22 EDT 2011 | remullis

We really don't go over board with stencil inspection either. I normally send my files to the vendor, they size and provide me with a check plot. I will verify everthing is oriented correctly and panel fiducials are in place. That's it. I don't know

Nano ProTek Coating

Electronics Forum | Fri Jun 17 16:29:05 EDT 2011 | markhoch

Has anybody else tried using stencils coated with Nano ProTek? I did find that I could reduce my cleaning frequency and squeegee pressure, which should help to increase stencil life, but I'm finding that it seems to wear off quicker than I thought i

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