09-07-2007, 03:13 PM
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 | | | Join Date: Mar 2004 Location: LaGrange, GA USA
Posts: 1,357
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My pump started life as a re-circulation pump in an ice machine. Worked quite well until my "filter" failed and a large piece of swarf decided to get between the vane and the housing. So I made up a new impeller to replace the plastic one and made the housing out of pvc pipe fittings. Diameter of the impeller is about 3.5" (Impeller diameter*rpm~= pressure output) in a centrifugal pump.
This combination has been working quite well for some time now. A 3.5" diameter impeller rotating at 3000 rpm is good (neglecting efficency) for about 31' of head (~13psi) and if it has a impeller depth of .5" will produce about 5gpm.
In my case, I use 1/2" poly line to feed my single nozzle on the mill/drill and drain back into the 5 gal. bucket. And I find that I am usually throttling the valve to keep coolant from going all over the shop as my mill is not enclosed. My primary filter is simply a piece of fiberglass window screen stuffed into a 4" piece of pvc pipe in the bucket. Every once in a while, I pull it out to flush the swarf off. So far, it works quite well for a hobby setup.
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