I have to believe that the single most important factor in determining
stencil life is the skill and care used by the technician when setting
up and running production.
I have replaced stencils because something got dropped on them, or they
got dropped onto something. I have replaced stencils because they were
setup incorrectly, just a bit too much "on contact" printing, so that
the stencil now displays a beautiful topographical map of the circuit
board.
I have never replaced a stencil because it was just plain old worn out
or fatigued.
Hal
PS This is of course, referring to the days when I worked in the
contract assy end of things, instead of OEM. Now it is "somebody else's
problem." :-)
-----Original Message-----
From: Morse, Carrie [mailto:[log in to unmask]]
Sent: Friday, April 08, 2005 9:20 AM
To: [log in to unmask]
Subject: Re: [TN] Stencil Wear
The answer to that really lies in the following question:
"How many licks does it take to get to the center of a Tootsie Pop?"
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Leland Woodall
Sent: Friday, April 08, 2005 3:52 AM
To: [log in to unmask]
Subject: [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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