Electronics Forum | Mon Aug 19 13:47:45 EDT 2019 | emeto
Forget about a stencil here. The only solution I have for you is to dispense this paste. There are some super cool Jet printers out there that will do the job.
Electronics Forum | Fri Aug 23 01:40:14 EDT 2019 | sssamw
Such huge difference between low and high thickness will definitely cause paste accumulation on the squeegee side. Normally is 2 mil max difference.Yes, dispense maybe help for thicker paste or print two times.
Electronics Forum | Mon Aug 12 12:16:25 EDT 2019 | SMTA-Martial
Hi, We are using a 15mils to 5 mils step stencil with a metal blade. The 15mils area the surface is smooth and polish and in the 5mils area the surface is rough and porous because of the laser process. In the 5 mils area where there is no aperture t
Electronics Forum | Sat Aug 05 09:22:34 EDT 2000 | Dave F
Stencil, Step Down. A stencil of varying thickness that allows printing different amounts of solder paste or adhesive. Most stencil suppliers make stepped stencils Step stencils are used when there are fine pitched device amoung coarse pitched dev
Electronics Forum | Fri Feb 24 08:29:25 EST 2006 | davef
Step stencils are not widely used, due to: * Higher cost as compared to uniform thickness stencils * Danger of solder paste smearing at least close to the steps * Difficulty of cleaning the stepped stencil underside (the steps cannot be on the upper
Electronics Forum | Thu Feb 23 19:55:30 EST 2006 | pjc
Not sure on stepped stencil designs, very application specific. Try consulting with your stencil supplier. Most of the big suppliers have applications engineering support. You can send them your board data and they can review and advise. Also, consid
Electronics Forum | Fri Jul 25 09:54:00 EDT 2014 | emeto
Hello all, what is your opinion on step stencils. Is it better to have the step on the squeegee side or on the bottom side of the stencil? Why you do it this way? What are the advantages and disadvantages?
Electronics Forum | Sat Aug 05 03:09:54 EDT 2000 | Felix
Dear Netters, Could anybody kindly advise : 1. what step stencil means 2. what are its characteristic ?? 3. What special process makes it? 4. What is the application ?? 5. Advantages and limitation ?? just short breifing is enough. Thanks Best
Electronics Forum | Sat Aug 05 09:19:50 EDT 2000 | JAX
Felix, 1-5: A step stencil is simply a stencil with area's of different thickness( step down's ). They are used for multi-package boards( BGA, fine-pitch, ..... ). They keep you from deciding whether or not you want the fine-pitch or the BGA devices
Electronics Forum | Wed May 30 17:59:16 EDT 2001 | jollyrodger
It may be the case (if you are using stencils to apply the epoxy) that you will have to indeed use a stepped stencil to appply the epoxy at a greater height. Not being an engineer i am not completely clear with the involvements of stencil design -
