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March 1999

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Subject:
From:
"Pealer, Mike" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Mon, 22 Mar 1999 06:57:14 -0500
Content-Type:
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text/plain (75 lines)
I have used DEK 265's for a little over two years and have never seen an
autoflex tooling pin break.  Although the majority of the high volume around
the clock usage was on boards that were only populated on one side.  Do you
have the standard autoflex or the fine pitch option?

> -----Original Message-----
> From: [log in to unmask] [SMTP:[log in to unmask]]
> Sent: Saturday, March 20, 1999 7:13 AM
> To:   [log in to unmask]
> Subject:      [TN] DEK Stencil Printer Autoflex tooling pin breakage
>
> 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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