Leland,

I think stencil life is affected more by the number of times a stencil has
to be set-up, cleaned and stored. Stencils that remain in place due to a
long running job seem to last longer than stencils that we set up and tear
down more often.

It could also be that I never run a large enough quantity to see the
stencil wear out. For us a 500 piece annual run is a big deal. So our
stencils tend to see more wear and damage from handling rather than the
actual stencil printing itself.

Bill Kasprzak
Moog Inc
Process Engineer, Electronic Assembly



Leland Woodall <[log in to unmask]>
Sent by: TechNet <[log in to unmask]>
04/08/2005 03:52 AM
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[TN] Stencil Wear






Hi everyone,

Can you possibly give me an expected time for the replacement of a 6 mil
laser-cut stencil in a process that uses lead-free paste coupled with
polymer blades?  I've had a lot of previous opinions, and few, if any,
match.

How many boards can be printed without fear of the thing wearing out?

I know many variables are involved, such as polymer durometer, aperture
size, etc., but is there a general consensus?

Thanks in advance,

Leland Woodall
Quality Coordinator

Keihin Carolina System Technology, Inc.


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