Old-fashion coffee grinders often relied on bevel gears for both mechanical advantage and ergonomics. A hand crank wheel provided ease-of-use torque input while gravity fed beans dropped vertically into the conical burr grinder. A simplified model of this conical burr grinder is shown below to illustrate the basic loading conditions. Each shaft is supported by a pair of bearings and the bevel gears provide a 2:1 ratio. The primary goal of this activity is to design the shafts to support the loading requirements while considering functionality and engineering design process. For this activity, details on the gears can be found by clicking on the following hyperlinks: Pinion Gear. The conical burr set has limited specification, but some important details can be found through the vendor website: Burr. Critical to this activity is the GD&T of each shaft, which requires specifications for shoulders, limits & fits, run-out, diameters, lengths, etc. For this exercise, assume a constant torsional load and net side load of T = 16Nm and Fb = 80N act on the end of the burr shaft. 40T 4 207 B A Figure 1. Loading condition model for traditional conical burr grinder. Complete a technical documentation of the engineering analysis to design the burr grinder shafts and address the following: Loading Conditions: bending moment, deflection, stress, bearing reactions, etc. Shafts: fatigue, limits & fits, shoulders, gears, bearing location, alignment, preferred size. Bearings: select from McMaster-Carr catalog to fit shaft.