>> I am all for the bell housing being done first. We have needed
one
>> of those for the last ten years. We also need to figure a way
>> of locking the input shaft seal in from the back side.
>> IMHO Tracy does it this way to provide support for the helical
gear
>> thrust bearing. Here is a dwg of the plate looking at it from
>> the back side. The seal is pressed in from the back side of the
plate.
>> Apparently there is very little room before the input shaft
spline.
>> The seal seems to be working out of the bore for whatever reason.
Maybe
>> high pressure in the gear box.
>>
>> BTW while we are at it we could put in a torque meter that would
measure
>> the helical gear thrust. There would be more room if there was
>> another way of attaching the helical gear to the input shaft
instead
>> of a pin. Perhaps it could be broached and silver soldered to
>> a spline on the input shaft.
>>
>>
>> Paul Lamar ...No rotor no motor.
>
> Why not put in a strain gage? Takes up almost no space. My son
found one > for
> $200, and it includes a meter.
>
> Doc Custer
> Retired Software Engineer and sometime Audiologist
>
> Is it a torque meter type? Is it new? Got a picture?
>
> -- > Paul Lamar ...No rotor no motor.

Doc,

Timely Post.  I was down at our test facility two days ago and notice
we
have a torque meter built-into our 5 kW electric motor dyno.  The
engineer
told me it worked using several photo optical devices.  He said
strain
gauges are OK but since their resistance varies with temperature we
would
need to have some type of circuit to  compensate for it.

Optically I don't how it works. Probably measuring the angle of
light
refraction.

Doug Fir

You can measure a very small amount of shaft twist with two optical
devices
separated by a finite distance along the length of a shaft with small
flats
ground in strategic places.

Here are some more ideas for the annular  pressure cylinder  trick.
This is widely used in turbo prop engines to read out torque.

Paul Lamar ...No rotor no motor.


Paul,
Not sure I believe my eyes. Is Tracy using a stack of Torring
bearings,
three each for clearance control? Sure wish I had know this when I
was in
the automatic transmission rebuilding business.A stack of 3? Thanks,
Boberrorusa

Not clearance control. Takes the helical gear thrust.
It is a cheap way to go. High RPM exponentially reduces the capacity
of needle thrust bearings.  Needle thrust bearings don't like high
RPM.
Three bearings back to back cut the individual RPM by 1/3rd. Tracy
replaced
the single roller thrust bearing with this system. Same as late model
Ross PSRU's.
-- 
Paul Lamar ...No rotor no motor.

Here is a rotary shaft dyno mechanism sold by land and sea I came across
last year.

http://www.land-and-sea.com/rotary-shaft-dyno/rotary-shaft-dyno.htm

Rob Woods

The problem is fitting it in here Rob.

"Simple installation? just replace the forward drive-shaft yoke with the
included modified OEM yoke and transducer assembly for most automotive
installations. The pick-up coil clamps onto the end of the transmission?s
tail-shaft. Wiring consists of connecting each of the DYNOmite?s two tachometer
leads and then plugging in the transducer?s shielded data cable and its 12-volt
lighter plug."

Also the cost would be a lot higher. We are talking about a simple
pressure gage on the instrument panel and a few parts made on any lathe.