The bronze bush is installed and here the pulley is rechucked to finish bore to be a close running fit on journal of Part S. This fit is now a lot closer than the original.
Looking from the back, all is looking good. In Hindsight the original circlip and washer that was at this end could have been retained, part S could be shortened a bit to be close to the circlip. A bit of a change in the design of the ball bearing carrier would be required to what I have done.
Aluminium piece machined with a recess that will be a press fit over the hub. I made it about 2 thousandths of inch interference. I heated the part with my electric heat gun and dropped it on the hub and lightly loaded it in a press until it cooled down. You can see I have made some reference marks on Part A showing the location of the spring retaining holes.
Before I shrunk it on I marked a PCD on the back face of it.
I marked out 1 place between the spring retaining holes then marked out 5 places. The holes were drilled and counterbored etc for M5x.8 socket head screws.
I then mounted this assembly on a simple parallel mandrel with a short slight taper at the chuck end, the mandrel accepted the bronze bush side. This bearing recess is thus true to the bore of the bronze bush. The ball race bearing is the same size as the other end ie 12mm ID x 28mm OD x 8mm wide.
On the front side I increased the diameter of the recess to accept an Aluminium ring that will retain a leather seal. I had to make the leather piece to only have very light contact with part S otherwise Part S was impossible to fit without getting the leather caught between part A and part S. Alternative idea. Make the ring to carry an O ring, O rings may not be the best for rotational sealing but the safety clutch only comes into operation ocassionally and then only for a short time, plus there is no pressure or thin oil to seal. I may make a new ring to take an O ring when I dismantle it again which will be in the near future as I want to load the springs a bit more. I will also enquire at my bearing supply place if a suitable lip seal is available.
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