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Reply To: | TechNet E-Mail Forum. |
Date: | Tue, 22 Dec 1998 09:32:00 +1100 |
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Hi Ed
Go through catalogs ( Molex ; AMP ; etc.) the drawings are fairly self
descriptive .
I just fished out few 5A rated compact con's (SMD's) to kill off the
last non reflowed components on our boards .
These particular Molex ones have flat film piece ( looks like a thick
Kapton tape ) non permanently glued on top to pick them from tape and
than you center as normal IC ;
the more troublesome you'd need a clip tool for your P&P and perhaps
design a tray if it's to loose from tape ; or customize vibro magazine .
The tolerances for paste in hole you can afford fairly wide ; as per
previous stencils discussions > open the slots to give you enough paste
.
The better connectors have SM legs and TH anchors ; with the plastic
lugs ( like standard phone plugs ) you'll need something like one of
Yamaha' robots with vibro bowls ;
to force it in ; they're almost cheap . But before you'll go to extra
gear ; try to redesign ; the variety nowadays permits good solution .
If you can not ; than drill bigger holes and rely on terminals to
support the component ( low usage ) .
Other thing is press melt (Teflon tip) the lug in hole afterwards ; if
time and application will allow you .
The lug should not miss the holes ; with tooling holes or fiducials on
board and proper head on place gear .
I thing the clip plastic lugs will be disappearing as time goes, for
exactly this difficulties on autoplace ; it's too reliant on hand
dexterity and force .
And yes ; the con. Co.s are slowly getting there ; use tech support
folks .
Let me know if you have specific specs ; it's possible I've been through
it .
Or check with Bev ( he may be hibernating , pretending it's Christmas
time ) or one of his pals ( check archives for Nortel mechanics ); the
high volume guys do usually have this things sorted out ; minority is
even allowed (or bothers) to go public . Last time I needed something
from Philips it took me weeks to get clearance and even than I was lucky
to be in unrelated field ; sad , but understandable . Nortel guys are
definitely one of better ones .
I left coms some years ago .
See you
Paul Klasek
http://www.resmed.com
> ----------
> From: Edward Brunker[SMTP:[log in to unmask]]
> Sent: Saturday, 19 December 1998 4:34
> To: [log in to unmask]
> Subject: [TN] Locating Lugs and hole tolerances.
>
> Hi,
>
> For auto. placement of SM connectors with plastic lugs, what's
> being
> used by companies generally. Ok, the important tolerances are PCB
> (PWB) drilling, placement accuracy of the equipment and the
> plastic
> mold. Do you just add the placement and drill tolerances together
> adding them to the maximum recommended hole dimension in the data
> sheet? Are there other factors? What are your practical
> experiences?
> What happens when the lugs miss the holes and the placement
> equipment
> continues to drive the lugs through the substrate? When you add
> up the
> possible tolerances, is there any point having lugs in the first
> place? Do connector companies consider auto. placement for these
> parts?
>
> Regards
>
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