>> >>      Kenneth
>> >>      Did a little more study of splines and find
>> >> that 24
>> >>      pitch is standard. That dictates a shaft
>> >> diameter of
>> >>      1.125 with 27 teeth or 1.25 with 30 teeth.
>> Do
>> >> you
>> >>      think it feasible to shape internal splines
>> in
>> >> lobes
>> >>      using EDM to minimize distortion and stress?
>> >> Also did
>> >>      a quick calc of torsion and find a 1" shaft
>> >> with
>> >>      active length of 8" will windup about 1 deg
>> >> under
>> >>      500#' torque. Don't know what's acceptable
>> or
>> >> if I
>> >>      analyzed correctly. What do you think.
>> >>      regards, Robert
>> >>
>> >> Robert,
>> >> You are correct, I don't believe you would ever
>> have
>> >> success broaching a
>> >> spline. I personally think persuing this method
>> >> would be folly. By the
>> >> time you have made the structure tight enough to
>> be
>> >> workable it would be
>> >> cheaper to turn and grind a shaft using a
>> >> conventional method! The fact
>> >> is that the e-shaft is a rather simple setup. It
>> >> requires that someone
>> >> with the proper dimensions go to someone with a
>> >> crank lathe and grinder
>> >> and pony up to get one made. FWIW
>> >> Bill Jepson
>> >
>> >
>> >
>> > Rolf and Bill
>> > Thanks for the comments. Glad to get expert
>> opinions
>> > on this. I guess if this were a viable approach it
>> > would already have been done.
>> > regards, Robert
>>
>>
>>
>> Robert
>>
>>
>>
>> To make a broach to press through the e-shaft lobe
>> and bearing adapters When
>> you ger your spline made the desired length get them
>> to make a twelve inch
>> long tapered spline that is .002' larger at one end
>> and taper the outside to
>> the size of the valley between the teeth at the
>> other end You want a 1/4"
>> hole through the center. Cut it into one inch
>> numbered sections then have it
>> hard cased.
>>
>> You then assemble the twelve pieses in the reverse
>> order and put a 1/4"rod
>> or bolt through them. You will not have difficulty
>> pressing this through the
>> drilled out lobe or bearing adapters.
>>
>> I just suceeded in pressing a 3.3" 90 tooth broach
>> through a 3/4"section of
>> a hole machined in two 12A rotors.
>>
>> The shaft in the following directions Is fully
>> enclosed within adapters or
>> lobes. there is very little deflection.
>>
>> It requires intermediate bearings.
>>
>> 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 1.182"
>> 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
>
>
>
>
> Kenneth
> This seems like a dumb question; but what is the point
> of broaching thru a rotor? Is this just a test? Altho
> your technique may produce an eshaft; in view of
> Rolf's analysis, it will not be up to the strength
> standards equivalent to a conventional eshaft.
> regards, Robert
>
> Robert, Please place your new messages at the end of the
> old messages to keep thinks in chronological order.
> Save time for me as I don't have to move them
> around.
>
> Paul Lamar ...No rotor no motor.

Robert
It appears that Rolf mis read the instructions.

The entire 1.182 diameter shaft is enclosed within lobes or bearing
journals. If it is made with drive shaft quality steel the only concern
would be the wishful thinking of having sufficient torque to sheer it by
using it for a six or more rotor engine..

The advantage of the shaft is it makes a six rotor engine possible.

Kenneth McKenzie


--------------------------
Maybe! Good luck :)

Here is a picture of Hurley's but I was never able
to find out how he did it.
-- 
Paul Lamar ...No rotor no motor.

Paul

This may be a dumb question. Is the Hurley motor  (2) 20 B's
bolted together or is it  (3) 13b's ? and is it a mockup?
would there be a difference.

Tony

Looks like it is made from 12A parts. I don't think it
is a mockup. Emon Hurley is too serious for that.
Anybody that has stepped off a supercharged NSU rotary
powered motor cycle at 179 MPH and lived to tell
about it is  pretty serious :)