Most simple way to dispence fluid one minim at a time ?

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SUMMARY

The discussion centers on the most efficient and cost-effective method for dispensing fluid manually, specifically one minim at a time (0.00208333 fluid ounce). A suggested solution involves using a Micrometer Head attached to a 1/2cc Insulin Syringe, which can dispense approximately 1 minim (0.0591939 CC). An alternative off-the-shelf option is a Hamilton Company pump, which offers a 3mm stroke with a resolution of 30,000 steps, though it requires RS-232 programming and a custom cable. The feasibility of achieving precise alignment and managing tolerances is also highlighted as a concern.

PREREQUISITES
  • Understanding of fluid dispensing mechanisms
  • Familiarity with micrometer heads and syringe calibration
  • Knowledge of RS-232 communication protocols
  • Basic principles of tolerance and precision in mechanical systems
NEXT STEPS
  • Research Hamilton Company fluid dispensing pumps and their specifications
  • Explore the use of Micrometer Heads in precision dispensing applications
  • Learn about RS-232 programming and cable configurations
  • Investigate methods for achieving concentric alignment in syringe-based dispensing systems
USEFUL FOR

This discussion is beneficial for engineers, hobbyists, and researchers involved in fluid dispensing applications, particularly those seeking low-cost and precise solutions for manual fluid measurement.

GHooper
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I have a project I am working on and can't decide what the simplest (and lowest cost) method would be to dispense a fluid manually one minim at a time (0.00208333 fluid ounce)

I though about a Micrometer Head affixed to a 1/2cc Insulin Syringe,
(1 minim, = 0.0591939 CC)

Any other ideas or off the shelf suggestions ?

Thanks...

Ghooper
 
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I don't know what kind of budget you have, but here's an off the shelf suggestion:

http://www.hamiltoncompany.com/products/oem/c/286/

The 3mm stroke can be set to a resolution of 30,000 steps, so with a small diameter syringe in the pump you can get very precise dispensing. One major downside though is having to use RS-232 and hyperterminal to program and run it. It also uses a non-standard pin layout for RS-232 so you have to either make your own cable or pay extra for theirs.

If you're going the cheapest way possible then your suggestion sounds reasonable, but I'm not sure how you will get it lined up perfectly concentric, and your stopper will likely compress so you will have some kind of offset. What kind of tolerance is reasonable for your project?
 
Last edited:
What are your tolerances?
 

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