>Fill the glass delivery tube with the substance you want to deliver.
>Connect the full diameter end to the smallest diameter flexible tubing you
>can find (this is particularly important if you plan to move the glass
>delivery tube to the target).  Take a SPDT solenoid valve on the common
side
>put a short length of tubing with a closed end to act as a small pressure
>tank (the volume of this "tank" and the air pressure will determine how
much
>substance is delivered).  Apply air pressure to one switched leg of the
>solenoid valve and connect the other switched leg to the flexible tubing
and
>delivery tube.

Yes, I understand the principle you are describing. We have a similar system
here which uses disposable syringe bodies with an air operated piston to
deliver small quantities of epoxy for component staking on our space
electronics assembly. Using a foot switch it is quite controllable.

I have had a go with it, and it works quite nicely for that. Must try it
with some solder paste. As you say, the biggest hassle is choosing the
correct diameter nozzle/needle to use.

--
http://www.piclist.com#nomail Going offline? Don't AutoReply us!
email listserv@mitvma.mit.edu with SET PICList DIGEST in the body