Answers to HW#9 Gears

1) Npinion = 17T    Ngear = 153T

diameter_pinion = 2.125 inches    diameter_gear = 19.125 inches

Does not need idler--draw to scale

 

2) Npinion = 17T    Ngear = 136T

diameter_pinion = 2.833 inches    diameter_gear = 22.666 inches

Needs idler to reverse direction -or- can design as internal gear pairing

Draw to scale

 

3) Problem 9-12

Use 2 x 3 x 5 x 5

Gear    Teeth    Diameter

2            17        2.833

3            34        5.667

4            17        2.833

5            51        8.5

6            17        2.833

7            85        14.167

8            17        2.833

9            85        14.167

Draw to Scale

4) Problem 9-15 (meant to say 9-16 b/c we did this one is class)

See class notes.