that's a great recommendation
i guess now i'll have to buy it!
thanks
Dennis Saputelli
Brad Velander wrote:
>
> Dennis,
> yes I think it is worth it. I have used the SMT+ system for approx.
> 7 years. Formerly I was sitting and doing the calculations by hand based
> upon their methods. Sometimes this was painful to calculate all the pad
> sizes and then the precise pad centers. This was before my present employer,
> we purchased the footprint guide just over a year ago, it has probably saved
> me probably about 10 - 20 man days of time since purchasing it. Does that
> not justify the cost? I know some companies would still balk at the cost but
> then they are being penny wise and dollar stupid. I just advised an
> inexperienced acquaintance to purchase the Land pattern guide and asked him
> how much it would cost to just re-run one board design if there were a
> problem with land pattern shorts, skew, tomb-stoning. I know that some
> people use the patterns supplied by component manufacturers, but I have seen
> some horrific land patterns in suppliers technical data over the years. And
> those patterns typically still leave you in the dark over paste mask
> application. SMT+ system uses pastemask apertures which match the pad sizes
> and shapes, with a solder deposition of 6-8 mils thickness. Voila , all in
> one. If you tried that with component manufacturers suggested patterns, you
> would have solder deposition all over the range and a lot f compromises.
> While it is not necessary, I had taken the SMT+ course where they
> taught the footprint design mechanics years ago. James Blackenhorn can
> justify each of the footprint designs, seems he first developed the system
> when managing such aspects for a large captive fabrication and design shop
> years ago. Reportedly he and his crew spent long hours developing and
> testing their pattern designs before he eventually set out on his own and
> started SMT+.
>
> Brad Velander,
> Lead PCB Designer,
> Norsat International Inc.,
> #300 - 4401 Still Creek Dr.,
> Burnaby, B.C., V5C 6G9.
> Tel. (604) 292-9089 direct
> Fax (604) 292-9010
> website www.norsat.com
>
> > -----Original Message-----
> > From: Dennis Saputelli [mailto:[EMAIL PROTECTED]]
> > Sent: Monday, July 16, 2001 10:02 AM
> > To: Protel EDA Forum
> > Subject: Re: [PEDA] need uMAX10 footprint
> >
> >
> > thanks Brad
> > so i take it you think it is worth it?
> >
> > Dennis Saputelli
> >
--
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tel: 415-647-0480 2851 21st Street
fax: 415-647-3003 San Francisco, CA 94110
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