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July 2000

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From:
"Hamilton, Richard CLE 4454" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Fri, 21 Jul 2000 10:37:51 -0700
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Morning Bev,

Here are my 2cents worth (no change due back, please!)

1)We use a 'kinked' lead on the device which is designed to 'snap' into the
board and thus hold the component in place for handling and soldering.

2)The purpose for us is to 'stand-off' the component from the thru-hole so
that the meniscus formed on the lead of the component does not get into the
thru-hole and thereby does not become a hindrance to any soldering taking
place in the hole. This would be more of an issue with single sided boards
than with double sided plated thru. Of course is it does get into the hole,
then an inspector has to question a solder joint they cannot see! An
additional purpose is to 'hold' the component in the upright position so it
does not interfere with insertions for other components, automatically or
manually.

3)As for inspection for the standoff forming and placement, we use the
process to let us know if there is a problem. As long as the auto insertion
equipment does not 'hiccup' at the components and the insertions are
performed 'normally' then we like the components. After wave the soldering
process is looked at including the soldering of all components. As long as
the components are sitting up 'off' the board and a good joint is visible,
great.

Hope this helps. Have a great Friday! (Sure hope it is better than mine is
going!)

Richard Hamilton
Clemar Mfg. / Rain Bird
[log in to unmask]

> -----Original Message-----
> From: Bev Christian [SMTP:[log in to unmask]]
> Sent: Friday, July 21, 2000 5:52 AM
> To:   [log in to unmask]
> Subject:      [TN] Mounting- Vertical - Radial Leaded
>
> Here's an easy one.  Page 5-12 of IPC-A-610C shows radial PTH components
> with a standoff between the component base and the board.  1) How do you
> all
> meet this requirement?  2) What is the purpose of it? 3) How do you
> inspection for it?
>  My guesses:
> 1) lead forming, soluble plastic disks or tubing, friction fit, by chance,
> don't
> 2) heat dissipation, inspection, strain on solder joint
> 3) eye, thickness gauge, don't
>
> I await your sage comments, oh wise ones.
>
> regards,
>
> Bev Christian
> XLTEK
>
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