Electronics > Projects, Designs, and Technical Stuff

Stencil printer

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rx8pilot:
If your syringe is completely bubble free, the problem of continuous flow is drastically reduced. I purchased the paste in a syringe so it has no bubbles, then transferred it to the actual dispensing syringe with a tapered plastic tip that I cut with a razor blade. Whether being dispensed manually or with my pneumatic machine there is no post-flow to speak of. I almost never use the vacuum option on the pneumatic dispenser and I don't have to pull back the plunger when doing it manually.

If you are trying to fill a syringe with a spatula from a jar, it is very unlikely you would not have big bubbles that will make things hard to deal with.

zapta:
Are those dispensers stand alone products or do they require external supply of pressure and/or vacuum?

rx8pilot:
Generally, they all need external compressed air source. The compressed air drives a venturi that created a vacuum as needed. The air requirements are very small. I use a very quiet California Air compressors model that is far more than enough and quiet enough to keep close by. Only $195USD on Amazon

I run at 40-60psi with my Zephyrtronics Air-Mill. It was a MAJOR process improvement for me at the time - before I got a stencil printer. It still gets quite a bit of use for small proto boards when it is faster than setting up the printer or when I don't even have a stencil.

zapta:

--- Quote from: rx8pilot on October 04, 2014, 11:47:14 pm ---I had been looking at various P&P machines but decided that going in the order of OVEN first, PRINTER, second, and P&P third is a good path. The addition of the stencil printer has been awesome.

--- End quote ---

Are you already using one of those manual P&P with a vacuum pump and pedal? If not, this can be a cheap and very useful increment.

rx8pilot:
I have an electric vacuum pen and some PCB holders that I machined - no P&P yet. I would like to have something as soon as possible - hand placing 0402 passives and .4mm QFN's is not going to be a fond memory. Decided to skip the manual machines and save up for the real thing.

Up to about 225CPH by hand, which is about as good as I will ever be. Even a cheap ($30k) P&P is 10x faster and does not take coffee breaks. It will also allow be to take advantage of panelized PCB's instead of going one at a time.

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