Crank balancing 28, 6G74 crank

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  • Опубликовано: 13 сен 2024
  • This is just a straight back to back comparison of balance from the last one. A stock 74 crank with 950g bobweights. The balance is fairly good but could be better. I've added magnets to fine tune it a bit.
    One full turn of the dial is 1mm and a deflection of 10 on the needle is 0.10 mm.
    It's a second set of bobweights of course because the 6G72 big ends are 50 mm and these are 55 mm.
    As far as the deflection goes, what does it all mean? Other balancing videos mention grammes but that's meaningless. If we can get the total runout on the dial gauge to be less than 0.05mm, that's the difference between the geometrical centre and the mass centre and that's the diameter, not the radius. Compare that to the bearing clearance? If the runout wants to be greater than our bearing clearance, then that's going to cause problems over and above any problems caused by combustion forces.

Комментарии • 3

  • @andrerousseau5730
    @andrerousseau5730 Месяц назад

    You must really hate those dial indicators!

    • @1magnit
      @1magnit  Месяц назад +1

      I've also got electronics and a scope. The dial; indicators though, they're nice and simple.

  • @earleclemans4836
    @earleclemans4836 Месяц назад

    Step away from the pipe