Question

A gear reduction unit uses the countershaft shown in the figure. The solid steel shaft is simply supported by bearings at points O and C. Gear A receives power from another gear with the transmitted force FA applied at the 200 pressure angle as shown. The power is transmitted through the shaft and delivered through gear B through a transmitted force Fa at the pressure angle shown. 0 350 mm 225 ma Gear A 500-mm dia Gear B 200 mm dia F.-ISAN (a) Sketch and describe a general shaft layout, including means to locate the gears and bearings, and to transmit the torque. (b) Determine the power transmitted through gear A if the shaft is running at a constant speed of 400 rpm. (c) Carry out a preliminary design of the shaft using ASME Code (B106.1M), in which a suitable material is selected, and appropriate dimensions for each section of the shaft are estimated, based on providing sufficient fatigue and static stress capacity for infinite life of the shaft, with minimum safety factors of 1.5. After the design, produce dimensioned sketches of the different sections of the shaft (0,A, C, and B). Also, sketch and dimension the entire shaft ("blended sections') with justification for blended diameters. Make any other justifiable dimensional decisions necessary to specify all diameters and axial dimensions. (d) Produce a CAD drawing of the shaft to scale. Make use of decimal place tolerancing in the (e) Not required: Using finite element analysis/method (FEA/FEM) software (SolidWorks). (0 Not required: Produce a 3D print of your designed shaft from the NCAT COE student title block. Add some specific size and geometric tolerances to the drawing. perform static and fatigue analysis of the designed shaft. Makerspace lab. See Trevor Surratt for assistance.

Answer 1

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