Re: Stepper motor questions
 

The good news is that syringe pumps (exactly as you describe you are building) are commercially available and used in laboratory environments. They are simple, work quite well, and delivery liquid accurately. They can be (and are) controlled effectively using Labview.

The corollary is that you can buy a syringe pump. You should chack this out and do a make-versus-buy analysis.

Re: Stepper motor questions
 

Syringe Pump suppliers:

economical:
http://www.syringepump.com/?gclid=CO...FctL5QodWWq4Gg

pricy:
http://www.kentscientific.com/produc...yringe+Pu mps

http://www.coleparmer.com/catalog/pr...x.asp?cls=7459