Presentation is loading. Please wait.

Presentation is loading. Please wait.

The Unit Organizer LAST UNIT/ Experience GDT CURRENT UNIT Create Gear & Cam Mechanism Drawings NEXT UNIT/ Experience Solid Modeling Pre-Test Vocabulary.

Similar presentations


Presentation on theme: "The Unit Organizer LAST UNIT/ Experience GDT CURRENT UNIT Create Gear & Cam Mechanism Drawings NEXT UNIT/ Experience Solid Modeling Pre-Test Vocabulary."— Presentation transcript:

1

2 The Unit Organizer LAST UNIT/ Experience GDT CURRENT UNIT Create Gear & Cam Mechanism Drawings NEXT UNIT/ Experience Solid Modeling Pre-Test Vocabulary Drawings Reading Self-test questions Goal Assessment UNIT SCHEDULE 1.What purposes do gears serve and where are they used? 2.What are the features of a typical gear drawing? 3.What purpose do cams serve and where are they used? 4.What is the relationship between a cam profile and a displacement diagram? UNIT SELF-TEST QUESTIONS UNIT RELATIONSHIPS Gear & Cam Mechanisms Is about… Requires that we understand… We must be able to identify Types of Gears Gear Terms Cam Terms Spur gear Worm gear Bevel gear Rack gear Root dia. Pitch dia. Outside dia. Base circle Pressure angle Various Devices are used to Transmit Power and Motion The Big Picture Requires that we understand… Number of teeth Involute profile Addendum Dedendum Gear ratio

3 GEARS GEARS ARE USED TO TRANSMIT POWER AND ROTATING MOTION FROM ONE MACHINE PART TO ANOTHER. SPUR WORM BEVEL RACK

4 Objectives Identify and describe various gears and their applications Identify and describe various gears and their applications. Spur Gear Spur Gear Worm Gear Worm Gear Bevel Gear Bevel Gear Rack Rack

5 Spur Gear entals.html Click on the link below and view the gear in action. Spur gears operate on axes which are parallel.

6 In the simplest case, a set of gears results in the same rotation speed on both the input and the output axle. This happens if both gears have the same number of teeth. However, in most cases gears are used to change the speed and mechanical advantage between axles. For simple gears calculating this gear ratio is simply a matter of counting the number of teeth on each gear and comparing by dividing the number of output teeth by the number of input teeth. Gear Ratio

7 For example, if the input gear has 12 teeth and the output gear has 24 teeth, then the gear ratio is 24/12 = 2. The standard nomenclature for this is to use a colon and relate the gear ratio to one, for example 2:1. INPUT GEAR OUTPUT GEAR

8 Spur Gear i

9 Gear Nomenclature

10 Determining the Base Circle

11

12

13 Worm Gear entals.html Click on the link below and view the gear in action.

14 Worm Gear

15

16

17 Bevel Gear entals.html Click on the link below and view the gear in action

18 Bevel Gear

19

20 Rack entals.html Click on the link below and view the gear in action

21

22 Gear Applications Subaru Transmission LEGO Transmission

23

24 The Unit Organizer LAST UNIT/ Experience GDT CURRENT UNIT Create Gear & Cam Mechanism Drawings NEXT UNIT/ Experience Solid Modeling Pre-Test Vocabulary Drawings Reading Self-test questions Goal Assessment UNIT SCHEDULE 1.What purposes do gears serve and where are they used? 2.What are the features of a typical gear drawing? 3.What purpose do cams serve and where are they used? 4.What is the relationship between a cam profile and a displacement diagram? UNIT SELF-TEST QUESTIONS UNIT RELATIONSHIPS Gear & Cam Mechanisms Is about… Requires that we understand… We must be able to identify Types of Gears Gear Terms Cam Terms Cam Follower Displacement diagram Various Devices are used to Transmit Power and Motion The Big Picture Requires that we understand… Spur gear Worm gear Bevel gear Rack gear Root dia. Pitch dia. Outside dia. Base circle Pressure angle Number of teeth Involute profile Addendum Dedendum Gear ratio

25 Objectives Identify and explain terms related to Cams. Cam Cam Follower Follower Displacement diagram Displacement diagram

26 HOW CAMS WORK FOLLOWER ROLLER CAM CAM SHAFT Cam A Cam is a rotating part that changes rotating motion into reciprocating motion.

27 HOW CAMS WORK Cam A Cam is a rotating part that changes rotating motion into reciprocating motion.

28 HOW CAMS WORK Cam A Cam is a rotating part that changes rotating motion into reciprocating motion.

29 HOW CAMS WORK Cam A Cam is a rotating part that changes rotating motion into reciprocating motion.

30 HOW CAMS WORK Cam A Cam is a rotating part that changes rotating motion into reciprocating motion.

31 HOW CAMS WORK Cam A Cam is a rotating part that changes rotating motion into reciprocating motion.

32 HOW CAMS WORK Cam A Cam is a rotating part that changes rotating motion into reciprocating motion. Click on the camshaft below and view the cams in action.

33

34

35

36 Instructions: Scale the drawing shown for all necessary dimensions. Then, using AutoCAD, create a cam that will move the Lever Arm roller to the position shown and then back to its original position in one 360 degree revolution. Refer to Fig in Technical Drawing textbook for sample. Advanced: Create a solid model assembly of this mechanism. CAM DESIGN PROBLEM

37


Download ppt "The Unit Organizer LAST UNIT/ Experience GDT CURRENT UNIT Create Gear & Cam Mechanism Drawings NEXT UNIT/ Experience Solid Modeling Pre-Test Vocabulary."

Similar presentations


Ads by Google