Shaft Spacer
Shaft Spacer
(OP)
Hi,
I have a shaft with an outside dia. of 8 inches and inside dia. of 6 inches. I want to reduce the inside diameter to 4.5". Is there a way to determine the outside dia. or wall thickness required to respect the same properties of my shaft in terms of torsion?
Thanks
GAbriel
I have a shaft with an outside dia. of 8 inches and inside dia. of 6 inches. I want to reduce the inside diameter to 4.5". Is there a way to determine the outside dia. or wall thickness required to respect the same properties of my shaft in terms of torsion?
Thanks
GAbriel





RE: Shaft Spacer
Polar Section Modulus, Zp = .196 ((D^4-d^4))/D)
D = OD
d = id
(From Machinery's Handbook)
Solve for Zp with 8"D and 6"d
Then solve for the equivalent D with a 4.5"d
RE: Shaft Spacer
You would just calculate your present polar moment of intertia, then plug the new ID into the same formula and set it equal to what your present J is and solve for the OD algebraically.
I hope this isn't homework.
Don
Kansas City
RE: Shaft Spacer
Thanks a lot guys. I appreciate it!! Always so helpful!!