Figure 2 
Weld tube to inlet plate
(Click to view full size)

1. the rotor assembly
2. the rotor case
3. inlet nozzle (Figure 1)

Case Ring

We'll start out by assembling the case ring. The assembly consists of three parts:

1. case ring
2. inlet tube
3. inlet plate (Figure 2)

Begin by welding the case inlet plate to the case inlet tube. Next fit the case inlet tube through the case ring hole -- making sure the tube is positioned 90 degrees tangent to the case ring -- then weld in place on the outside of the ring only.

Finish by grinding the inlet tube to match the inner diameter of the case ring. (Figure 3)

Inlet Nozzle

End Plates

Finish the edges of the case end plates using a file or lathe bit. Next (using a lathe, mill or hand grinder) carefully cut a grooved slot on the inside faces of both end plates to accept the case ring. The groove should be cut 0.0625-inch deep, and just wide enough to allow the case ring to easily slip into the groove. (Figure 4)

Next, the four holes that mount the case back plate to the main case must be counter-sunk to ensure that the main mounting bolts do not protrude beyond the back plate inner face. (Figure 5)

Finish by beveling the outer case bolt holes with a deburring tool or oversized drill bit.