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Date: Thu, 24 Feb 2005 17:21:47 -0700
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
From: Bill Dube <bdube@al.noaa.gov>
Subject: Re: [FlyRotary] Re: E-shaft permanent magnet alternator
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At 02:21 PM 2/24/2005 -0500, you wrote:
>Bill Dube wrote:
>
>>
>>>  The issue would be the spline pattern on the sun gear shaft.  Is it 
>>> the same diameter, does it have the same number of spines, and is there 
>>> enough spline available in front of the flex plate to fit the rotor 
>>> on?  I know the hole in the rotor is a 1" diameter, 10-spline hole.
>>
>>
>>         What would prevent you from just sliding the rotor (with just a 
>> round hole) over the splined shaft, and attaching it to the flexplate 
>> with a few screws? Splines are expensive to machine.
>
>
>Balance.  Control that and you're golden.  Get it off center by a little 
>and...well...I don't know what would happen...but I BET that it wouldn't 
>be good 8*)

         Simply bore the center hole to be a very light press fit over the 
splined shaft. Warm up the rotor slightly up and slip it in place.

>I like the idea of using the splines, because that will control the 
>balance, and provide solid trap for all the radial forces driving the 
>system.  With the screws, you're depending on them for both radial and 
>axial forces.  Not that they can't be sized appropriately,  I just don't 
>think they'd be as dependable as the spline.

         The cost of machining the spline will likely be greater than the 
cost of the rest of the rotor.