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April 2002

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Subject:
From:
"Misner, Bruce" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Fri, 19 Apr 2002 08:11:19 -0500
Content-Type:
text/plain
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text/plain (115 lines)
Shirley,

That's the nature of the beast.  That's why they usually are bonded to
aluminum backer plates.  You could try to use large flat washers and set the
torque requirements quite low (you will need torque requirements).  Loctite
or equivalent is a must to hold the screw (I am assuming you are screwing
through the board to something metal on the other side, other wise you are
in serious trouble or I don't have enough information to understand your
application and configuration).

Good Luck,
Bruce Misner

> ----------
> From:         [log in to unmask][SMTP:[log in to unmask]]
> Reply To:     TechNet E-Mail Forum.;[log in to unmask]
> Sent:         Thursday, April 18, 2002 5:32 PM
> To:   [log in to unmask]
> Subject:      Re: [TN] Hole cracking of Teflon PCB after screwing
>
> that even sounds painfull, sorry couldn't resist!
>
>
>
>
>
>
>
> Shirley Xiao <[log in to unmask]> on 04/18/2002 05:00:47 AM
>
> Please respond to "TechNet E-Mail Forum." <[log in to unmask]>; Please
> respond to
>       Shirley Xiao <[log in to unmask]>
>
>
>
>
>
>
>
>
>  To:       [log in to unmask]
>
>  cc:       (bcc: Warren Crow/US/I-O INC)
>
>
>
>  Subject:  [TN] Hole cracking of Teflon PCB after screwing
>
>
>
>
>
>
>
>
> One batch of double sided PCB using teflon materials
> have hole cracking problems after screwing by electric
> driver.The borad is easy to break if I bent it. Is it
> do to laminate quality problem?
> What kind of test shall I have?
>
> Thanks in advance!
>
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