Richard
I see there are already two responses to this, but I'll add my two cents
worth.
Wave fixturing is good both for partial wave applications and for boards
where the entire board is waved. For total wave, the use of a fixture
allows you to rigidly clamp (z axis) the board so you don't have to
worry about warping, and can allow you to use one common conveyor width
for higher throughput.
Delmat works fine in low volume applications and can be machined fairly
quickly. It also has the advantage of being able to be modified very
quickly if needed. I have used it in the past for prototype work, and
the ability to whip out a file and shave off a bit here or there was
very useful when an EC came through. The only downside I found was a
degradation over time that allowed the fibers to rub off (which REALLY
annoyed the operators). This seemed to depend on the flux being used.
I was ordering (previous employer) fixtures from MB Manufacturing, and I
do recommend them highly - excellent service.
MB Manufacturing,
350 Rte. 46 E., Rockaway, NJ, 07866, USA
TEL: 201-586-2988; FAX: 201-586-1692
The other alternative I've seen used are titanium fixtures made from
spot welded sheet TI. More expensive, takes longer to make them, a real
pain in the butt to modify, but excellent for long term / high volume
production.
Call if I've left you with questions.
regards,
Graham Collins
Process Engineer,
Litton Systems Canada
(902) 873-2000 ext 215
> -----Original Message-----
> From: Blanchet,Richard [SMTP:[log in to unmask]]
> Sent: Thursday, December 11, 1997 6:20 PM
> To: [log in to unmask]
> Subject: [TN] Assy: Selective soldering
>
> Hello,
>
> I'd be interested in learning about anybody's experience with
> selective
> soldering done on a full-size wave soldering machine. I'd like to know
> what
> materials you guys use to cover the solder bath or the PCB itself, as
> well
> as things to pay special attention to, tricks, tips, etc.
>
> You can respond to me through technet or directly. Thank you.
>
> Richard Blanchet
> Manufacturing Engineer
> Canadian Marconi
> [log in to unmask]
>
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