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Acceptable Run-Out ?

Discussion in 'Other Norton Motorcycles' started by Dixter, Aug 11, 2019.

  1. Dixter

    Dixter

    Joined:
    Aug 11, 2019
    I'm refurbishing a circa 1960 AMC gearbox for a Matchless G80 road bike. Overall the g/box looks good, light corrosion from moisture, no indication of broken gears, nor hard use.

    Measuring the main shaft, I find approximately 0.004" TIR (Total Indicated Run-out), measured at the center of the shaft. The intended use is occasional day rides, no competition use.

    What is acceptable TIR on this component?



    Ciao,
    Dick C
     
  2. Burgs

    Burgs VIP MEMBER

    Joined:
    Dec 14, 2013
    Hi Dick
    I would put it between centres, as long as the centre holes are still both ok, and check both journals, the threaded end is more than likely giving a false reading.

    Burgs
     
  3. Dixter

    Dixter

    Joined:
    Aug 11, 2019
    Ciao Burgs, thank you for your reply. Between centers is my preference as well, unfortunately someone with a hammer and a pair of vice grip pliers removed that option. Recognizing the threaded surface introduces an error was my next best choice.

    Do you happen to know if Norton (or others) produced a standard for acceptable TIR on this component?

    Ciao,
    DC
     
  4. Burgs

    Burgs VIP MEMBER

    Joined:
    Dec 14, 2013
    Hi
    Norton would have had tolerances that they worked to, 0.004" on a bronze bush might just be ok?
    I haven't any Norton gear boxes apart, had a look at a Daytona shaft but it is a bit like yours, a gorilla has had a go and centres us.

    Sorry I can be of no help.
    Burgs
     
  5. Bernhard

    Bernhard

    Joined:
    Apr 20, 2011
    The factory must have had pretty worn out machinery if the runout is .004thou.

    I would suggest the tolerances would be more like + or – 0.001 thou!
     

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