Wednesday, October 04, 2006

 

Biollante



My carpentry could use some work, but there it is. Now comes the bit where I actually have to make it move... the upcoming weekend will hopefully show some progress.

Comments:
So how are you planning to make it move? By injecting fluid into the syringes?
 
Yes, exactly.
 
Fascinating! :-)
 
I'm sure we'd all be interested in seeing/hearing about the pump system you have in mind. Centrifugal, Peristaltic, etc. And how valves might be used, all that.

You're definitely in uncharted territory here, send us more postcards :)
 
Why not just use another syringe with the plunger driven by a threaded rod for each of the six syringes? You'd need six motors to make that work, but if you use pseudosteppers that shouldn't be a bankrupting exercise.
 
Sorry for my terse reply earlier, I was in a hurry.

My plan is what plaas said. Six totally closed syringe-to-syringe arrangements. Unless something leaks, there'll be no slip. Some sort of pump with valves, on the other hand, would accumulate error over time -- literally.

I had planned to use stepper motors, no pseudo. Is a pseudostepper that device hashed out a few weeks ago, a DC motor controlled with an optical encoder?
 
Just one suggestion, finding hose that doesn't bulge out under pressure will help keep things accurate. I think translucent silicone hose might not be much use...

They sell neoprene pressure hose for car full injection systems, cheap and incredibly tough. Might be a good candidate.
 
Six totally closed syringe-to-syringe arrangements.

Aha. It seems so simple now. Lol, I was thinking all about pumps and valves and lots of complicated nasty stuff. That's both easy to build, and a nice trig review for the programmers.
 
***Is a pseudostepper that device hashed out a few weeks ago, a DC motor controlled with an optical encoder?***

It uses a magnetic encoder.
 
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