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December 2001

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Subject:
From:
"<Peter George Duncan>" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Thu, 13 Dec 2001 09:51:36 +0800
Content-Type:
text/plain
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text/plain (119 lines)
I second Paul's suggestion, and back up all the other comments that have
been made about the dangers of trying to "normally" mount an electrolytic
in this situation. Is your customer just arrogantly stubborn, or does he
have a very good reason for needing the componenet mounted hard down? It
really isn't possible to do without component damage in the short term,
unless you are allowed to put a stand-off/isolator washer between component
and PCB that accommodates the stress relief forming of the leads (such
isolators are available). The isolator would offer mechanical support to
the electrolytic while also providing relief to the leads (unless there is
a height constraint).

If you are still forced to follow customer instruction to hard-mount, I
would issue a written disclaimer that you will not be held responsible for
the failure of this component.

Good luck. Hope there isn't too big a rock near the hard place.

Peter Duncan




                    Lucas
                    Paul-R32425            To:     [log in to unmask]
                    <Paul.Lucas@MOT        cc:     (bcc: DUNCAN Peter/Asst Prin Engr/ST
                    OROLA.COM>             Aero/ST Group)
                    Sent by:               Subject:     Re: [TN] To form or not to Form
                    TechNet
                    <[log in to unmask]
                    G>


                    12/13/01 07:25
                    AM
                    Please respond
                    to "TechNet
                    E-Mail Forum."






Andre,

Is there clearance around the capacitor? If there is, why not lay the part
flat on its side with the legs parallel to the board and then form the
leads to fit the holes? It will take several bends to align to the hole and
another bend to put the leads down into the hole but,the part will be flat
against the board and there will be no stress on the leads at the body
part.

Paul

-----Original Message-----
From: Andre Leclair [mailto:[log in to unmask]]
Sent: Wednesday, December 12, 2001 6:26 AM
To: [log in to unmask]
Subject: [TN] To form or not to Form


Hi all
I hope this gets some good advice.

I have a customer who is requiring the placement of an electrolitic cap
that has a lead spacing of 0.140" and the PCB has 0.100".  They do not want
the leads formed, they want the part flat to the board.  In doing this, am
I opening myself up to stress induced failures of the component.

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