Crane Manufactures Asso. of America (CMAA) 70 Question

[BPres]

I want to use the allowable stresses listed in 3.4 Allowable Stresses for a calculation. However, for clearification, in CMAA 70 the far right column of listed allowables, 3.4.1, 3.4.2, and 3.4.3, is "Allowable Bearing Stress" the same as bending stress?

 

[johnp]

No
1 - Bending Stress is related to flexing of a beam - you need section modulus to calculate the stress.

2 - Bearing stress is related to the area under compression at the support of a shaft. If it is too high you will crush the bearing material - be it white metal, bronze bush, polyurethane, or whatever.

 

[chadegani]

hi
would you please help me where can i get for free CMAA70
thanks alot

 

[RockEngineer]

Some Libraries may have a technical section with a copy of CMAA 70 to read or check out but the organizations pay for researching and publishing the specification by selling them. They are not free.

 

[mrMikee]

The MHIA bookstore has some good crane and material handling info including the CMAA 70 spec.

http://www.mhiastore.org/category.cfm?Category=39