[time-freq] Handling 0603 parts

[Luis Cupido]

For the flying off problem the trick is not the size of the tip
but rather the force of the tweezers themselves.
I must be a very soft spring action from the tweezers for you to know
and control how much force you're applying to the 0603 part,
otherwise if just to close the tweezers you need some force then
you likely apply too much force to the part and it flies off at supersonic 
speed :)

Luis Cupido
CT1DMK


----- Original Message ----- 
From: "Christopher T. Day" <CTDay at lbl.gov>
To: "TAPR time and frequency projects" <time-freq at lists.tapr.org>
Sent: Monday, May 01, 2006 4:05 AM
Subject: RE: [time-freq] Handling 0603 parts


Steve,

I'm trying to work my way through the 196 tweezers in the catalog. The
SMD-specific ones I've looked at seem to be for larger devices, ~5mm or
so. I imagine that's not what you had in mind. 60deg bend only at the
tip or swoopy along 1/3 the length? How about the carbon fiber ESD
devices? Worth the money? Or are anti-magnetic, anti-acid ones good
enough? Enquiring minds want to know.


Chris - AE6VK


P.S. - Before I managed to stop myself, the following escaped:

1 @ 51 ohm
1 @ 220 ohm
2 @ 1K ohm

P.P.S. - Double-fisted soldering, no less. And I've always considered my
left hand purely decorative.



-----Original Message-----
From: Steven Bible [mailto:n7hpr at tapr.org]
Sent: Sunday, April 30, 2006 4:16 PM
To: TAPR time and frequency projects
Subject: RE: [time-freq] Handling 0603 parts

Hi Chris,

The best way is to use a very good pair of tweezers.  The pair I have
have a
very sharp point and curve about 60 degrees.  Look in the Newark
catalog.
There's a nice selection.

When you open the tape of parts, use the tweezers to grab and pull back
on
the clear part of the tape (the clear part of the tape is the cover).
Carefully pull the cover open and pour the parts ontop the work bench.
It
is best to only work with one value at a time (this way they don't get
mixed
up).  Next, use the tweezers to pick up and place the parts into place.

Here's a web page I started on how to solder surface mount parts for the
DSP-10.

    http://www.tapr.org/~n7hpr/dsp-10/

I use to use no-clean flux, but I switched to organic water soluable
flux.
The reason was cleaning.  The no-clean really needed to be cleaned with
isopropyl alcohol.  The organic cleans with water, which is much easier
to
do.  I use a small bottle of organix flux with a needle dispensor.  I
apply
it to the work and then solder.  The flux helps the solder flow and
sweat
into position better than without flux.  One rule with organic flux, you
must clean it!  Don't let it set on the PCB overnight.  Once you are
done,
give the board a good washing in warm water and soap.  Allow to dry (I
use
compressed air to blow the excess water off).  If you don't clean the
organic flux off, any amount of moisture will active the flux later on
and
corrode the PCB and parts.

Let me know what parts you need, I'll ship them to you.

73,

- Steve, N7HPR
 (n7hpr at tapr.org)





> -----Original Message-----
> From: time-freq-bounces at lists.tapr.org
> [mailto:time-freq-bounces at lists.tapr.org]On Behalf Of Christopher T.
Day
> Sent: Sunday, April 30, 2006 3:06 PM
> To: TAPR time and frequency projects
> Subject: [time-freq] Handling 0603 parts
>
>
> For those who have constructed the RefLock II board:
>
> How do you physically handle the 0603 parts? So far, about 30% of mine
> have gone flying off to oblivion. I'd like to know other folks success
> rates so I have some idea how many duplicate part lists I'm going to
> have to order from Mouser before I can expect to get every thing onto
> the board. :) Thanks.
>
>
> Chris - AE6VK
>
>
>
> _______________________________________________
> time-freq mailing list
> time-freq at lists.tapr.org
> https://lists.tapr.org/cgi-bin/mailman/listinfo/time-freq


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