Just playing with an idea to make a motor driven super soaker type device. Basically a 3inch diameter syringe. I’d like to keep it contained in the 3" pvc pipe if possible.
A bit stuck on the best way to drive the thing.
My first instinct was a screw driven plunger but that would double the length of the device which is less than ideal. I’m also not sure how to waterproof the motor I’m thinking a stuffing box like on a boat prop.
Just curious if anyone had some alternate ideas?
Perhaps a compressed air driven plunger?
Maybe, I don’t want to use a big compressor but maybe something like a water rocket compressed air tank.
I’ve seen an automated medical syringe that uses a rack and pinion to drive the piston.
Similar to this.
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That’s basically the leadscrew solution, but instead of being twice as long, it is “folded”.
Yeah, wonder if there would be a way to make a screw water tight and just use a captive nut on the plunger with the screw passing through. It wouldn’t need to be perfect just prevent too much compression loss during actuation.