Re: [DIYbio] update on the liquid handler

On 02/06/2015 01:42 AM, Tom Eberhard wrote:
> I'm working on gettig an off-axis pump working.

I suppose you are meaning some kind of positive displacement pump?

1. peristaltic tubing pump?
2. valved pump?
3. vane pump?
4. adjustable flow by variable-angle-of-drive ceramic piston-as-valve pumps?

I like the design of 4. but they are still patent protected and expensive.
They do volumes like .5 cc/second at pressures like 30 PSI easily, which is
so far beyond liquid handler needs that less expense makes more sense.

2. with pinch valves makes sense for tubing -- up to an accuracy point of diminishing returns
depending on tubing qualities.

2. with valves being made by driving a diaphragm all the way to seal against the chamber it
pumps in is a thought I had. Some kind of flat films assembly of low cost/throw-away
plastic layers fabbed to make a pump with some dynamics that
are not so easy to deal with, but it can be shut off to be drip free
is what I see as a next "good thing" for liquid bots. Some diligent motor code
experimenting and the "not so easy dynamics" come under fine control.

It won't look like a syringe, but rather a strip of tape That clamps between two blocks
that have squeeze actuators in them. It would have a row of 3 or 4 or 5
pockets in the tape with flow restricted paths between them and pump by careful timing of
the squeeze actions. Some really careful timing and maybe you cold stop it without
an extra unplanned droplet and so use it as a pipettor that would not dribble between
positionings.

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