> >> 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.

-- 
Paul Lamar ...No rotor no motor.

Paul,

I wasn't suggesting to use this instead. I just wanted to point out to
the closest thing on the market I have seen to an axial strain gauge
dyno for reference. There setup is for cars but something similar could
be cooked up for other shaft arrangements. I didn't look at the pressure
thing you were talking about. Just tossing more veggies into the soup.

Rob

Sorry! I assumed you were suggesting it for our use. It will work great
in a rear drive car.