We run four lines , have not experineced any thing like you have described ,
had machines for three years . pleased with their performance.
>Folks,
>
>We are getting closer to being very happy with DEK stencil printers of the
265 GSX variety. Problems continue arising
>concering autoflex tooling pin breakage.
>
>We are told by the DEK engineering establishment they are seeing very
little breakage but ours. All be it, we do run 6
>SMT lines front ended with these nearly great machines (maybe not quite MPM
calibre), and we see about 5 pins break at the "glans"
>interface where the pin is screwed and loctited into the retainer cup/drive
piston. We run many different board
>configurations with about 12 million placements per month with a great
majority being fine pitch requiring corresponding pins.
>
>The break is as if some torsional or side loading force was excercized.
Upon further examination, while understanding the
>acceleration and air pressure force (10 Bar or about 140 psi? accelerating
the pins from 0 to 60 in a nanosecond) we see
>evidence of complete separation of the pin from its retainer. The metal
seems fatigued with a small tip left remaining as if
>it had been subjected to tensile and elongation testing and failed the pull
at about 10K psi.
>
>The pins probably are machined on swiss screw equipment. They are necked
down just before the threads meet the main shaft
>body. This is wherein lies the probable cause. It is possible the pins are
fatiguing because of acceleration and some side
>loading after acceleration and upon making board contact when the table rises.
>
>The question is: Do any other DEK users have similar problems? If so, how
often and why do you think it's happening?
>
>Thanks,
>
>Earl Moon
>
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>
Melvin B. Moschler, Jr.
Process  Engineer
K-Byte Hibbing Manufacturing/ Hibbing Electronics Corporation
3125 14th Ave E., P.O. Box 129
Hibbing MN, 55746-0129
phone:  218-262-8213
fax:  218-263-8970
e-mail : [log in to unmask]

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