SWMBO says it's time to post.
I've wanted a pump for quite a while. But couldn't decide between buying a March pump or trying to build one myself. I liked the idea of only having a short piece of tubing to clean and not having to worry about priming or running dry. I read the other peristaltic pump threads and went for it.
Here is my proto-type.
The housing is made of 6 layers of 3/8 plywood. It has 3 roller arms with 2 on the tubing at any time. The springs are located at the elbow of the arms. It works in either direction, but I use it counterclockwise.
I geared a 1725 motor down to 45 RPM to give a pumping volume of 1 Gal./Min. through a 3/8" high temp silicone tubing.
I tried to find out how much lift it has but I gave up after 16FT.
I've used to 6 times now and still modifying it. So far it seems to be holding up, but time will tell.
I have more construction pics if anyone is interested.
I used to today. The following is a live action shot pumping a Porter from the boil kettle through a 25FT pre-cliller, through a Shirron plate chiller, into a Korney ready for fermenting. From 212F to 60F in less that 5 Min.