If the board is never bumped or tipped upside down, then yes the clinch is
unnecessary.  We have seen components "jump" out of their holes as the board
is being handled for hand insert components pre wave solder and in the
process of loading the boards in the wave solder machine.  Then the question
is where did the parts come from.

Regards,

Phil Nutting

-----Original Message-----
From: Pelchat, Janice [mailto:[log in to unmask]]
Sent: Friday, September 29, 2000 7:44 AM
To: [log in to unmask]
Subject: Re: [TN] Lead Clinching over soldermask


Is there any possibility of eliminating the clinch altogether?  If the holes
are plated through, was there some other reason for having the clinch?

Jan Pelchat

> -----Original Message-----
> From: Mike Sewell [SMTP:[log in to unmask]]
> Sent: Thursday, September 28, 2000 4:57 PM
> To:   [log in to unmask]
> Subject:      Re: [TN] Lead Clinching over soldermask
>
> We have gone to a partial clinch already... and shortened lead protrusion
> to
> ~ 50 thou. this has helped but hasn't eliminated the problem.  I think we'
> may be bending leads during handling as this board goes through axial,
> CS400,
> masking, hand stuff after DIP and prior to wave.  Plus we still have the
> axial & CS400 parts that may get clinched towards a trace - we've tried to
> tweak to partial clinches there as well. 600 - 700 parts on the board
> THOUSANDS of leads, poor spacing, undersized holes/oversized parts,
> another
> board where DFM wasn't exercised...
>
> - Mike -
>
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