3D printed Peristaltic Pump

[cropwell]

Very nice project Rob Its the type of pump they use to pump your'e blood around Yes it would be good to put the parts list up. A nema 17 would be big enough I would think.
Have you done the code to meter the liquid ?

I haven't done the code yet. The first was to get the pump working.

I only used a nema23 'cos I have 4 Astrosyn MY103H702 motors (not much good for anything!) sitting in a box in a cupboard, together with 3 Parker Digiplan PK2's and a PK3.

It took a lot of furtling to get the internal dimensions of the pump right. About 3 incarnations of the pump body and 4 of the rotor. The tyres (5 or 6 variations !) were a late addition as the bearings were too narrow to squash the tube efficiently (loss of pressure and backflow, also wouldn't self-prime). The 5mm holes had to be drilled out to 5.5 and the rotor fitted to the shaft by filing out and then softening the plastic with an Iroda miniature heat gun, before pushing it on to the shaft. It makes a nice fit though and doesn't need a grub screw.

The bearings are 3x10x4 (Inside hole, Outer diameter, Thickness) and the stub axles are M3 stainless hex button heads with 12mm of thread length, clamped down with a nut to the rotor and another to hold the bearing. All stuff I had in my small bits collection.

Here's a dropbox link to the stl files -
https://www.dropbox.com/sh/wenlkj8lj...gyh7ICoTa?dl=0


Cheers,

Rob