The impeller relief needs to be done in the lathe. You would need an 3D NC

mill

do it in a mill. Too wide for one cutting edge. Also there is another

boring operation

that could be done in a mill but is easier in a lathe. A DRO would make

drilling

the holes for the cartridge mount easier but I don't have one. An NC mill

would

make the whole thing a lot easier.

Paul Lamar

A rotary turntable would be the best plan if you are limited to manual
mills.

Larry Wiechman

I have a lathe so that is easier for the tapered impeller surface.

Paul Lamar
 
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