[time-nuts] Parts Selection - Short Run Assembly

Steve Wiseman sjwiseman at gmail.com
Sat Mar 26 14:10:13 UTC 2011


On 26/03/2011, Bob Camp <lists at rtty.us> wrote:

> Best bet - get / make a simple screen printer. A manual one is going to be
> cheap. A home made one is even cheaper. The solder screen it's self won't
> cost you much more than the time you would spend programming the robot and
> messing with it. Solder screen / stencil generation is a "push button" sort
> of thing with a modern pcb layout program.

plastic stencils are cheap, I get mine from
http://www.smtstencil.co.uk/
No need for any machinery, just tape it to the board, then squeegee
the paste using a credit card. Works fine, for low volume, and is
easily capable of 0.5mm pitch.

More of a concern, if issuing kits of parts, is how to deliver
fine-pitch QFPs with their legs intact. The best way to package them
for shipping may well be to attach them to a PCB with some kind of
melted metal...

(This is probably my first post here. Hobbyist / engineer running an
old but adequate True-time GPS and Rubidium , to keep the test gear
(sufficiently) truthful.)

Steve




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