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.

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