In the double-reduction gear train shown, shaft a is driven by a motor attached by a flexible…

In the double-reduction gear train shown, shaft a is
driven by a motor attached by a flexible coupling attached to the overhang. The
motor provides a torque of 2500 lbf in
at a speed of 1200 rpm. The gears have 20 pressure angles, with diameters
shown on the figure. Use an AISI 1020 cold-drawn steel. Design one of the
shafts (as specified by the instructor) with a design factor of 1.5 by
performing the following tasks.

(a) Sketch a general shaft layout, including means to
locate the gears and bearings, and to transmit the torque.

(b) Perform a force analysis to find the bearing reaction
In the double-reduction gear train shown, shaft a is
driven by a motor attached by a flexible coupling attached to the overhang. The
motor provides a torque of 2500 lbf in
at a speed of 1200 rpm. The gears have 20 pressure angles, with diameters
shown on the figure. Use an AISI 1020 cold-drawn steel. Design one of the
shafts (as specified by the instructor) with a design factor of 1.5 by
performing the following tasks.

(a) Sketch a general shaft layout, including means to
locate the gears and bearings, and to transmit the torque.

(b) Perform a force analysis to find the bearing reaction
forces, and generate shear and bending

moment diagrams.

(c) Determine potential critical locations for stress
design.

(d) Determine critical diameters of the shaft based on
fatigue and static stresses at the critical

locations.

(e) Make any other dimensional decisions necessary to
specify all diameters and axial dimensions. Sketch the shaft to scale, showing
all proposed dimensions.

( f ) Check the deflection at the gear, and the slopes at
the gear and the bearings for satisfaction of the recommended limits in Table
72.

(g) If any of the deflections exceed the recommended
limits, make appropriate changes to bring

them all within the limits.

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