Category:PCB Assembly SMT Stencil

Group Administrators: 0 | Group Member: 42 | Group Threads: 39

The purpose of an SMT stencil is to transfer solder paste to a bare circuit board. Before the assembly of the SMT components solder paste is printed onto the component pads of the printed circuit board by stencil, which are today usually manufactured from steel, more rarely from nickel or polyimide.

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Search Results: 39 Threads,4 Pages
5 answers
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blocking off stencil apertures with tape

I recently started at a new company. They have a variety of bare PCB's and most have aprox. 20 variations. Maybe about 1/3 of each board on average are non-populated locations. They buy one stencil fo... (See More)

Eden
2017-02-28 04:01:44
Brook
2017-03-02 04:01:44
5 answers
322 views

SPC for MPM UP1500 Stencil Printers

This is a general question just to see what people may be doing to control the stencil printing process. I am new to the stencil printing process and as the subject line states I am looking to set up ... (See More)

Charlie
2017-02-28 03:19:02
phenmarks
2017-03-02 03:19:02
4 answers
249 views

lead-free stencil printing

hi, I am a research student in Electronics manufacturing at RIT. We are planning to assemble boards using lead free solder paste. I was wondering there be any changes in printing in using lead-free pa... (See More)

Csaba Simon
2017-02-28 01:39:31
effevalerio
2017-03-02 01:39:31
4 answers
377 views

Stencil Fiducial Repair

I have a stencil, on which the fids are no longer black enough for my screen printer to find them. A long time ago at a previous place of employment we had a loctite product to fill these in as a perm... (See More)

fandreu
2017-02-27 19:22:43
Clare
2017-03-01 19:22:43
4 answers
384 views

PCB stretch

I look for an international standard for PCB stretch . In case of misplaced solder paste versus stencil we noticed shorts after placement . I found cases where the PCB (image pattern) did not match wi... (See More)

Nicolas Giussani
2017-02-27 19:21:20
CurveAudioDesign
2017-03-01 19:21:20
5 answers
366 views

Laser Cut Stencils

We make an excellent chem-etch stencil. Our customers have had success printing 16 mil pitch without a problem. This is not an advertisement! When we try to sell our product to new customers, we... (See More)

Achim Paulduro
2017-02-27 06:45:31
Berger
2017-03-01 06:45:31
4 answers
255 views

uBGA stencil design

I was looking for an stencil design for a 0.5mm pitch uBGA. Pad size is 0.38mm in diameter. We have been using 5mil stencil with type 3 no clean paste. What size aperture should we be using? Any sugge... (See More)

dioannis
2017-02-02 21:55:32
p_harris1234
2017-02-04 21:55:32
4 answers
344 views

stencil to pcb manufacturing tolerance

Can anyone tell be what is the acceptable manufacturing tolerance from stencil to PCB . 2) what are the methods we can avoid that. 3) What is the method to avoid PCB shrinkage. 4) How can we correct s... (See More)

tomikkudziati88
2017-02-02 19:03:34
jluisdrv
2017-02-04 19:03:34
5 answers
325 views

Stencil Cleaner Chemistries

Hello all, Just curious as to what type of chemistries most people prefer to use and what produces the best results. We currently have an EMC Global Technologies Cyber Clean 1000 Model 32P system. We ... (See More)

Hank
2017-02-02 00:26:15
givisas
2017-02-04 00:26:15
5 answers
387 views

SMT adhesive printing

I have a question regarding post cured property of SMT adhesive. If after component placement, the epoxy dot gets compressed and bridges between the 2 pads, what would the impact on the circuitr... (See More)

ErikLee
2017-02-02 00:22:20
Byron
2017-02-04 00:22:20
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