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

 Are there no comments or critiques of this approach?
Is this practical? The welding portion seems
questionable and unnecessary. This co. makes custom
crankshafts the old fashioned way; no CNC.
http://www.truetube.com/
regards, Robert LeClercq

Somebody should get a quote from them on a one rotor
shaft.

Paul Lamar

THE WELDING PARTS SEEMS QUESTIONABLE AN D UNNECESSARY

Right, It was to make the machining simpler for a do it yourself person.

The!.82 inch diameter is the same diameter as the front shaft with the
thrust bearings, counterweight, oil pump drive, timing gear and front
pulley.the spline teeth would make it slightly larger.With the larger back
drive shaft to the flex plate the engine would have to be assembled back to
front. As the parts are sandwiched this makes a multiple rotor engine easier
to assemble.

This design uses the Mazda e-shaft lobes that can be cut from the e-shaft
with a metal saw.

A one rotor shaft would require a counter weight. Look up balancing a one
cylinder engine for information that may or may not apply.

The standard two lobe e-shaft is balanced without the counter weights when
placed over knife blades.

Kenneth McKenzie


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