MCDESG-116 Design Elements
Assignment 6:
Shaft design: Shear & Moment Diagrams, Torque Diagrams
MCDESG-116 Page 1
Name __________________________________________
XXXXXXXXXX
Co
ections
Item Score Item Score
Original Diagram /10 Original Diagram /10
a Torque /5 Torque /5
Gear FBD /10 Belt FBD /5
Gear Calculation* /10 Belt Calculation /5
c
Belt FBD /5 Weight FBD /5
Belt Calculation* /5 Weight Calculation /5
d
Chain FBD /5 Gear FBD /10
Chain Calculation* /5 Gear Calculation /10
e ↔ Reactions /10 ↔ Reactions /10
f ↕ Reactions /10 ↕ Reactions /10
g Load Diagrams /15 Load Diagrams /15
h Shear Diagrams /10 Shear Diagrams /10
i Moment Diagrams /15 Moment Diagrams /15
j Torque Diagrams /10 Torque Diagrams /10
Total /125 Total /125
* Note: Answers in back of
ook are co
ect
Total Score /250
Total Percent %
Multiplied by 5.00% %
On Time Bonus (0.50%) %
Added to Grade %
Note: The results from this assignment will be used directly in the next assignment but one. Consequently,
there is a 25% penalty if this one is not completed in time and 50% penalty if a week late.
MCDESG-116 Design Elements
Assignment 6:
Shaft design: Shear & Moment Diagrams, Torque Diagrams
MCDESG-116 Page 2
Read Chapter 12, Sections 12-1 to 3. See also Example Problems 12-1, 2 & 3, but only with
egard to developing the Load, Shear, Moment & Torque Diagrams.
Fig 12-5 Fig 12.6
Rotation Speed 240 rpm Rotation Speed 310 rpm
Pulley A ø 12", 10hp OUT Pulley A ø 22", 120 lb, 20hp IN
Spur Gear D
48T, Dp = 6, = 20°, 15hp
IN
Flywheel C 1,550 lb
Sprocket E 5hp OUT Spur Gear E
36T, Dp = 6, = 20°, 20hp
OUT
Problems 12-5, 20, 21 & 28 Problems 12-6, & 29
1. See Fig. P12-5 in the problems at the end of the chapter. Do not do the problems as stated, but
follow the sequence below. Note the points on the cover sheet.
a. Find the torque transmitted to the gear and the torque transmitted in the sections of shaft
etween the gear and pulley and between the gear and sprocket.
. Find the tangential and radial forces exerted by the gear Q on the gear D. Resolve and
combine these forces into a horizontal and vertical component
c. Find the force exerted by the belt on the pulley and resolve and combine this force into a
horizontal and vertical component.
d. Find the force exerted by the chain on the sprocket and express it as a horizontal and
vertical component.
e. Find the reaction components at the bearings in the horizontal plane (include a check.)
f. Find the reaction components at the bearings in the vertical plane (include a check.)
On a single page (as shown in example):
g. Show the horizontal and vertical load diagrams.
h. Show the horizontal and vertical shear diagrams.
i. Show the horizontal and vertical moment diagrams.
j. Show a torque diagram.
MCDESG-116 Design Elements
Assignment 6:
Shaft design: Shear & Moment Diagrams, Torque Diagrams
MCDESG-116 Page 3
2. See Fig. P12-5 in the problems at the end of the chapter. Do not do the problems as stated, but
follow the sequence below. Note the points on the cover sheet.
a. Find the torque transmitted to the pulley and the torque transmitted in the section of shaft
etween the pulley and gear – note: NO horsepower is abso
ed by the flywheel in this
problem.
. Find the force exerted by the belt on the pulley and resolve and combine this force into a
horizontal and vertical component. ADD THE PULLEY’S WEIGHT IN THE VERTICAL
COMPONENT.
c. Express the weight of the flywheel as a vertical component.
d. Find the tangential and radial forces exerted by the gear E on the gear Q. Resolve and
combine the Reaction forces into a horizontal and vertical component. ADD THE GEAR’S
WEIGHT IN THE VERTICAL COMPONENT.
e. Find the reaction components at the bearings in the horizontal plane (include a check.)
f. Find the reaction components at the bearings in the vertical plane (include a check.)
On a single page (as shown in example):
g. Show the horizontal and vertical load diagrams.
h. Show the horizontal and vertical shear diagrams.
i. Show the horizontal and vertical moment diagrams.
j. Show a torque diagram.