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1. What is the angular range between the input shaft and the output shaft in which this mechanism will work?
2. Is the speed increased, decreased, or constant?
3. Is the torque increased, decreased, or constant?
4. What is the speed ratio of the input shaft to the output shaft?
5. Is the flow of power reversible? (Can you make the input shaft turn by turning the output shaft?)
6. Do the input and output shafts turn in the same direction?
7. List an example where this mechanism might be used. For help, go to www.askjeeves.com and use keyword: universal joint.
Bevel Gear Assembly
1. What is the angle of the input shaft compared to the output shaft?
2. Is the speed increased, decreased, or constant?
3. Is the torque increased, decreased, or constant?
4. What is the gear ratio?
5. Is the flow of power reversible? (Can you make the input shaft turn by turning the output shaft?)
6. List an example where this mechanism might be used. For help, go to www.howstuffworks.com and use keyword: bevel gear.
Simple Gear with Idler
1. What is the relationship of the input shaft compared to the output shaft?
2. Is the speed increased, decreased, or constant?
3. Is the torque increased, decreased, or constant?
4. What is the gear ratio?
5. Is the flow of power reversible? (Can you make the input shaft turn by turning the output shaft?)
6. Compare the direction of travel between the input and output gears.
7. Predict what the direction of travel would be between the input and output gears if the idler gear is eliminated from the mechanism.
8. List an example where this mechanism might be used. For help, go to www.howstuffworks.com and use keyword: gears.
Worm and Wheel
1. What is the angle of the input shaft compared to the output shaft?
2. Is the speed increased, decreased, or constant?
3. Is the torque increased, decreased, or constant?
4. What is the gear ratio?
5. Is the flow of power reversible? (Can you make the input shaft turn by turning the output shaft?)
6. Is the direction of travel reversible? (Does the mechanism still work if the crank is turned in the opposite direction?)
7. List an example where this mechanism might be used. For help, go to www.howstuffworks.com and use keyword: worm gear.
Crown and Pinion
1. What is the angle of the input shaft compared to the output shaft?
2. Is the speed increased, decreased, or constant?
3. Is the torque increased, decreased, or constant?
4. What is the gear ratio?
5. Is the flow of power reversible? (Can you make the input shaft turn by turning the output shaft?)
6. Is the direction of travel reversible? (Does the mechanism still work if the crank is turned in the opposite direction?)
7. List an example where this mechanism might be used. For help, go to www.howstuffworks.com and use keyword: gears.
Rack and Pinion
1. What is the type of input movement? (rotary, reciprocating, or linear)
2. What is the type of output movement? What distance does the rack move with one revolution of the crank?
3. If the diameter of the pinion gear were increased, would the rack move a shorter or longer distance?
4. Is the flow of power reversible? (Can you make the input shaft turn by sliding the output shaft?)
5. Is the direction of travel reversible? (Does the mechanism still work if the crank is turned in the opposite direction?)
6. List an example where this mechanism might be used. For help, go to www.howstuffworks.com and use keyword: rack & pinion.
Lead Screw
1. What is the type of input movement?
(rotary, reciprocating, or linear)
2. What is the type of output movement?
(rotary, reciprocating, or linear)
3. How many revolutions of the crank are needed to move the screw block 1 inch?
4. Is the flow of power reversible? (Can you make the lead screw turn by pushing the screw block?)
5. Which is increased in the output? Force or speed?
6. Is the direction of travel reversible? (Does the mechanism still work if the crank is turned in the opposite direction?)
7. List an example where this mechanism might be used. For help, go to www.howstuffworks.com and use keyword: lead screw.
Pulley and Belt
1. What is the relationship of the input shaft compared to the output shaft?
2. Is the speed increased, decreased, or constant?
3. Is the torque increased, decreased, or constant?
4. What is the input to output ratio?
5. Is the flow of power reversible? (Can you make the input shaft turn by turning the output shaft?)
6. Does the input shaft turn in the same direction as the output shaft?
7. Does the input shaft turn in the same direction as the output shaft if the belt is crossed?
8. List an example where this mechanism might be used. For help, go to www.howstuffworks.com and use keyword: pulley.
Cam and Follower
1. What is the type of input movement? (rotary, reciprocating, or linear)
2. What is the type of output movement?
3. How many times does the follower move up and down with one revolution of the crank?
4. Is the flow of power reversible? (Can you make the crank turn by pushing the follower?)
5. Is the direction of travel reversible? (Does the mechanism still work if the crank is turned in the opposite direction?)
6. List an example where this mechanism might be used. For help, go to www.howstuffworks.com and use keyword: camshaft.
Crank and Slider
1. The input to this system is what type of motion? (rotary, reciprocating, or linear)
2. The output of this system is what type of motion? (rotary, reciprocating, or linear)
3. How far does the slider move with each revolution of the crank?
4. If the diameter of the crank gear were increased, would the slider move a shorter or longer distance?
5. Is the flow of power reversible? (Can you make the crank gear turn by pushing the slider?)
6. List an example of where this mechanism might be used. For help, go to www.howstuffworks.com and use keyword: crank and slider.
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