Instructions for making a balanced e-shaft

For general information the spline in the clutch disk in the 12A rotary
engine is less than a .9" inside diameter.

A Mazda e-shaft lobe has approximately a 2.92" diameter. I guess it has
about .01" hard casing around it

With driveshaft quality steel with a ¼" center oil hole  make a 1.82"
diameter spline with eighteen teeth the desired length of your engine.

Make a broach the same as the aforesaid spline and have it case hardened.

Drill out the oil hole in the e-shaft lobe sufficiently to enable pressing
the broach through creating interior teeth in the lobe.

Also drill holes in bearing size steel (adapters) and press the broach
through to place them as desired on the spline in your engine configuration.

Weld whatever end type you desire to the adapters.

It is suggested that bearing support be provided at intermediate housings.

In a two and four rotor configuration the lobes would be placed at 0 and 180
degrees.

In a three rotor configuration the lobes would be placed 120 degrees apart..

Kenneth McKenzie


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