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From: Jim Yanik
Subject: Re: having SMT components mounted
Date: Mon, 30 Sep 2002 16:09:13 +0000 (UTC)
Organization: Friends of Lummox
References: <3D985FEB.email@example.com> <3D97176C.E9037BCF@webaccess.net> <firstname.lastname@example.org> <3D972B11.375C7AD1@webaccess.net> <email@example.com>
NNTP-Posting-Date: Mon, 30 Sep 2002 16:09:13 +0000 (UTC)
"Frank Bemelman" wrote in
> "Chuck Simmons" schreef in bericht
>> Frank Bemelman wrote:
>> > "Chuck Simmons" schreef in bericht
>> > news:3D97176C.E9037BCF@webaccess.net...
>> > [snip]
>> > > There are small companies that do assembly. We use a shop where
>> > > the owner's son does much of the assembly. The son is still young
>> > > enough
>> > > see the parts and solder them though he does have to use a
>> > > microscope.
>> > I often use a stereo microscope, at least to check how and if I
>> > indeed have soldered all pins. During the soldering I use a
>> > jeweller's loupe, one that eh, fits in your eye. In the beginning
>> > they drop out of your eye all the time, but after a while it's
>> > amazingly easy to use.
>> Yes, the microscope we have is a stereo job. A low cost unit from
>> Edmund Industrial Optics but it serves well. I have a Behr 5X/10X
>> glasses clamp loupe (I also have a set of conventional loupes of
>> various powers). The Behr loupe was a bit expensive but I can attach
>> it to my glasses and flip the lenses out of the way when I don't need
>> The problem with working with a loupe is lack of depth perception.
>> The microscope is better but takes getting used to because the spaces
>> between pins look like canyons. Even if I could see my way clear to
>> soldering these fine pitch horrors, it would be expensive anyway.
>> Soldering a 208 pin part is mind numbing even to think about.
> I envy those surgeons that have loupes glued on their
> goggles. Bloody expensive, I found out :(
> Frank Bemelman
> (remove 'x' & .invalid when sending email)
I bought a magnifier headset from Home Depot,the General brand,IIRC.
Magnification is only 2.25X,IIRC,but it gives you a working distance of
about 8 inches. I wonder if those expensive medical magnifiers for detail
work would be better. EdSci sells them for ~ $450US,last time I looked.
They are like little telephoto lenses on a eyeglass frame,have a long
working distance and higher magnification. Of course,there may be less
expensive sources for them than EdSci.
Jim Yanik,NRA member
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