Register to reply

Calculate Mass Of Shaft and Hollow Shaft

by febbie22
Tags: hollow, mass, shaft
Share this thread:
Nov13-10, 10:24 AM
P: 38
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
Phys.Org News Partner Science news on
New model helps explain how provisions promote or reduce wildlife disease
Stress can make hard-working mongooses less likely to help in the future
Grammatical habits in written English reveal linguistic features of non-native speakers' languages
Nov13-10, 03:42 PM
P: 263
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.

Register to reply

Related Discussions
Replacing a hollow shaft with a solid shaft Engineering, Comp Sci, & Technology Homework 3
Hollow shaft coupled to another Introductory Physics Homework 0
Percentage saving in weight of sloid shaft Vs hollow shaft Engineering, Comp Sci, & Technology Homework 2
Percentage saving in weight of Hollow Shaft vs Solid Shaft Engineering, Comp Sci, & Technology Homework 24
Hollow shaft fatigue? Mechanical Engineering 5