On Thursday, September 25, 2014 2:24:15 AM UTC-7, John Griessen wrote:
On 09/24/2014 04:33 PM, Nathan McCorkle wrote:
>
> These are probably too small for most folks' needs:
> http://www.aliexpress.com/item/Treatment-2-phase-4-wire- stepper-motor-micro-screw- stepper-motor-stepper-motor- slide-slide/1111641517.html
Here's the type I was thinking of to drive a plastic rack (syringe handle pusher/puller):
http://www.aliexpress.com/item/20mm-2-phase-4-phase- hybrid-stepper-motor-6-wire- stepper-motor-micro-mini/ 1111628662.html
We've actually been using some small and cheap linear stepper motors for the BioPrinter project at BioCurious, but we found that they had a hard time ejecting fairly viscous alginate solution through a thin enough needle for bioprinting.
We're currently planning to adopt the Michigan Tech Open Source syringe pump design so we can put on a heftier NEMA 11 or 17, and switch to a higher volume syringe at the same time.
We were just playing with some pressure sensors yesterday as well - so we can better check on the performance of the syringe pumps. The SM5812-030-G-3-LR sensor can handle up to 30psi and has an amplified output (unamplified pressure sensors tend to have an output around 40mV), so hooking it up to an Arduino is a snap. Not as cheap as I'd prefer ($17.35 at Mouser), but acceptable.
Patrik
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