This is proving more costly than I thought. Very hard to machine
as it requires close tolerance to minimize the clearance
between impeller and housing. About three different lathe

and mill sets

ups are required. No easy way to rapidly mount it and

unmount on the

mill and lathe either.

I am building a test set using my CC mill as a power

source. I will be able to

run the pump up to 7000 RPM and drive it with a 2 HP mill motor.
I don't think a single V belt will transmit that much HP

so we shall

see. I have an eight inch die cast drive pulley and that might not
do the job so I am thinking of adding another one and use two
belts to drive the pump.

Bill ran the pump up to 5600 RPM and I am interested in seeing
what happens after that. I am also interested in seeing if the new
housing casting pumps more water at the same RPM.

I also have an optical tach so I can check the pump RPM

accurately.

Paul Lamar

Looks good Paul.

Paul,
What machining operations are required?  Is this all?
1.  face the impeller relief
2.  face the housing for the cartridge
3.  bore the intake hole
4.  bore the exit hole
5.  drill the holes for cartridge mounting
6.  drill the holes for engine mounting

  Can't all these operations be done with a CCM?  Seems that the only tooling would be a facer and a boring bar - is this so? I just bought an ENCO mill/drill off EBAY ($500)that just happened to be sorta local (120 miles away) so I was able to drive over to pick it up (and to see it before I paid for it).  BTW, this mill was made in Taiwan (in 1981) rather than Mainland China.

Thanks,
Ken Powell

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
 
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