Calculate Mass Of Shaft and Hollow Shaft

  1. Hi, i have a shaft with OD = 33.40mm Wall Thickness = 3.38 mm length = 2.4m

    Density of shaft = 2750

    The weight per unit length that is given is 0.8555 kg/m

    My question is how did they get it as im using the volume formula for a cylinder which is

    V=Pie*h(R^2 - r^2) then i times this by the density 2750 to get the mass but i get

    1.111 which then divided by 2.4 would be 0.463.

    Where am i going wrong.

    Thanks for any help
  2. jcsd
  3. Check you're using the correct numbers, and remember that the inner diameter is the outer diameter minus twice the wall thickness. That caught a few folks in my class out.
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