This may help ----

http://www.engineersedge.com/beambe...mbending4.htm ■

Hello B B Sokawukile,

Conveyor pulley shaft is an integral part of pulley assembly. So shaft actual deflection gets derived while designing the complete assembly, say as per Germany - Lange’s design theory. It is a complex design procedure, and not one isolated formula. This is so, because shaft deflection is influence by deflection of rim, diaphragms, hub grip on shaft, etc. (mutual influence).

If you are referring to shaft hypothetical deflection i.e. as if simply support beam at two ends, and two symmetrical loads (through diaphragms), then just refer mechanical or structural engineering text books and they prominently mention formulae for such commonly occurring load situation; stress, deflection, etc. at any point. The hypothetical deflection means as if shaft deflection and stresses not influenced by connected other item of the pulley. The formula will enable you to choose shaft diameter such that deflection remains within permissible limit.

Regards,

Ishwar G Mulani.

Author of Book : Engineering Science and Application Design for Belt Conveyors.

Author of Book : Belt Feeder Design and Hopper Bin Silo

Advisor / Consultant for Bulk Material Handling System & Issues.

Pune, India.

Tel.: 0091 (0)20 25871916

Email: parimul@pn2.vsnl.net.in ■