1. Complex Mechanical Function
System: set of components that share the same function
Complex mechanical function: role played by set of components in transferring motion inside a technical object

2. Example: Crankset of a Bike
A bicycle is a system of simple machines. It is made up of different components that work together.
All systems contain:
1. Driver: receives power to set system in motion
(sprocket of crankset)
2. Driven: receives the motion and transmits it to
another part (crankset to wheel)
3. Intermediate (may contain or not)
transfers motion between driver and driven

4. Mechanical Systems
When simple machines are combined, a MECHANICAL SYSTEM is formed
When the same type of motion is transmitted from one component to another without changing form, we call it MOTION TRANSMISSION.
When the type of motion changes from one component in a system to another, we call it MOTION TRANSFORMATION.

5. Motion transmission
Chain & sprocket

6. Motion Transmission Chain and sprocket
Connects components that are far away from one another.
gears don’t mesh together; connected with a chain (or sprocket)
Advantages
Chain meshes prevents slip
Great force aplied
Disadvantages
Constant lubrication
Limited speed

7. Motion Transmission
Belt & pulley

8. Motion Transmission Belt and pulley system(far apart)
When building a belt and pulley system, you must ensure:
Pulleys must contain a groove where the belt can fit
The belt must adhere to the pulleys
The smaller the pulley the faster it turns
Adv.- no lubrication, high speed
Disadv.- belt may slip or break

9. Motion Transmission
Gears

10. Motion Transmission Gear trains
Contains(nearby parts) at least two gears that meet and mesh together
Advantages
Motion constant,
Tiny spaces, high speed
Disadvan.
Precision, noisy, may need lubrication

11. Motion Transmission
Friction wheels

12. Motion Transmission 4. Friction gear systems (nearby parts)
Similar to gear trains yet less efficient (friction gears slip).
Larger the gear the slower the rotation
Adv.- easy to build, not noisy
Disadv.- wheels might slide over

13. 5. Worm and worm gear
Transmits rotational motion to non-parallel part (close together)
Teeth of worm slide into groove of worm gear thread
Adv.- doesn’t loosen when gear releases
adjusts precisely
Disadv.- hard to build, wears out

14. Motion Transformation
Recall: When the type of motion is changed from one component to another in a mechanical system, the motion has transformed.

15. Motion Transformation Systems
1. Slider- Crank System

16. Motion Transmission
This is the mechanisms used in pistons

17. Motion Transformation
Rack & Pinion

18. Motion Transformation
2. Rack and Pinion
Contains a rack (straight bar with teeth) and a pinion (gear)
While building a rack and pinion you must ensure that:
The teeth on the rack and on the pinion must be identical
The system requires frequent lubrification
The greater the number of teeth on the pinion the slower the rotation

19. Motion Transformation
3. Cam & Follower

20. Motion Transformation
Cam and Follower
Rotational motion changed to translation motion
When building a cam and follower, you must ensure that:
The follower must be guided in its translational motion
The shape of the cam determines how the follower will move
A device such as a return spring is usually necessary to keep the follower in continual contact with the cam.

21. Motion Transformation
4. Screw Gear System:
4. Screw Gear System: