Jeff,
  Slowly working my way through this rebuild of my single rotor
 engine.  Paul says you might be able to modify my Ross drive to accept
 a thrust bearing.  Can you do that?

  In addition to the drive itself, do you need the bell housing thwt it
 mounts to?

  How much will it cost, including the required bearings?

  Lewis Bjork,  801 968-3034


 Lewis

 sure...... I could tackle it with some coaching from Paul.....never done
 it before.........can't know what to charge until I talk to
 Paul..........

 jeff

 I would charge by the hour as every Ross drive was slightly different.
 It depends on how far the sun gear is from the mounting bulkhead and
 the sun gear it self. You might have to modify the sun gear slightly
 to get room for the thrust bearings.

 Paul Lamar



This what I think we need to do..............


1)  Sun gear/shaft shows on the drawings here the boss behind the
helical teeth at a dimension of 1.5". right now the boss is 1.808" and
needs to be turned down to the 1.5" dim and appropriate flat against
teeth to rest the thrust washer stack..


2) A hat section has to be made or the flange piece depending on the
path taken.   Material call out is not identified but assume it is
aluminum.. 2 different versions of the thrust bearing containment is
shown on the drawings here and the first one is definitely more
complicated and time consuming but in my opinion maybe better because of
the support of the shaft with the additional bearing surface inserted on
that newly machine boss....Looks like the hat section piece acts as
bearing surface with the bore.....if that's true that surface needs to
be a bronze bushing press fit into it.......??

3) Bore the bell housing to accept the hat section and drill and tap
mounting holes..........

4) build new expansion ring...

to be honest, now likely to get all this done in 4 hours,,so if that is
a problem, let me know.....


If anything  wrong let me know and tell me which direction of the 2 we
plan to take.........
Right now is a good time to order the parts get them to me so I can
measure the whole assembly before I make anything...........


Checking the unit now shows very little end play, doubt if it needs to
be opened up..

Jeff

The hat section idea has fallen into disfavor.
Just use the  wall of the Ross  housing as in these pictures.
Some of these dimensions may not be correct so check
all the clearances involved. Current Tracy's boxes use this scheme.

The two or 3 layer needles drastically reduce the RPM of the bearings greatly
extending the life.

Paul Lamar