Documents

VEX_-_Unit_6.pdf

Categories
Published
of 64
All materials on our website are shared by users. If you have any questions about copyright issues, please report us to resolve them. We are always happy to assist you.
Related Documents
Share
Description
1 Autodesk's VEX® Robotics Curriculum Unit 6: Gears, Chains, and Sprockets 2 I Autodesk's VEX Robotics Unit 6: Gears, Chains, and Sprockets Overview In Unit 6: Gears, Chains, and Sprockets, you modify the VEX test stand from Unit 5: Speed, Power, Torque, and DC Motors to learn more key engineering concepts that involve the use of gears, chains, and sprockets, along with key corresponding concepts such as reduction and ratio. The concepts regarding gears, gear rat
Transcript
  1 Autodesk's VEX® Robotics Curriculum   Unit 6: Gears, Chains, and Sprockets    2      Autodesk's VEX Robotics Unit 6: Gears, Chains, and Sprockets  Overview   In Unit 6: Gears, Chains, and Sprockets, you modify the VEX test stand from Unit 5: Speed, Power,Torque, and DC Motors to learn more key engineering concepts that involve the use of gears, chains,and sprockets, along with key corresponding concepts such as reduction and ratio.   The concepts regarding gears, gear ratios, force, torque, and motor speed have countless real-worldapplications. STEM Connections presents a scenario involving the operation of a winch installed on acoast guard helicopter for sea rescue operations. After completing the Think Phase and Build Phase inUnit 5: Speed, Power, Torque, and DC Motors, you will see how those concepts come into play in thereal world.   Unit Objectives   After completing Unit 6: Gears, Chains, and Sprockets, you will be able to:   Identify whether a gear reduction causes a speed reduction or a speed increase, and calculategear ratios.  Create a spur gear and animate a gear assembly using Autodesk Inventor Professional 2011.  See the relationship between gearing, speed, and power; and incorporate VEX gears into a design.  Modify the gearing of a VEX gearbox and understand the effect of gear ratios on speed andtorque.   Prerequisites   Related resources for Unit 6: Gears, Chains, and Sprockets are:    Unit 1: Introduction to VEX and Robotics  Unit 2: Introduction to Autodesk Inventor  Unit 4: Microcontroller and Transmitter Overview  Unit 5: Speed, Power, Torque, and DC Motors   Key Terms and Definitions   The following key terms are used in Unit 6: Gears, Chains, and Sprockets:  Term   Definition  Bevel Gear A kind of gear in which the two gears working together lie in different planes, andhave their teeth cut at right angles to the surfaces of two cones whose apicescoincide with the point where the axes of the wheels would meet. Chain A connected flexible series of links used for fastening or securing objects andpulling or supporting loads. Gear One of a set of toothed wheels that work together to alter the relation betweenthe speed of a driving mechanism and the speed of the driven parts.  Overview       3   Term   Definition  Gear Ratio The relationship between the number of teeth on two gears that are meshed ortwo sprockets connected with a common roller chain, or the circumferences of twopulleys connected with a drive belt. Gear Ratio Gear ratio in a gearbox or transmission: The ratio between the rates at which thelast and first gears rotate. GearReduction Involves using gears/sprockets/pulleys of two different sizes to work together,usually slowing output speed and increasing torque. Desired gear reductions canbe accomplished in one or multiple stages. Gear Teeth A gear is different from a pulley in that a gear is a round wheel which has teeththat mesh with other gear teeth, allowing force to be fully transferred withoutslippage. Sprocket Any of various toothlike projections arranged on a wheel rim to engage the links of a chain. Spur Gear Spur gears are the simplest, and probably most common, type of gear. Theirgeneral form is a cylinder or disk. The teeth project radially, and with these straight-cut gears, the leading edges of the teeth are aligned parallel to the axisof rotation. These gears can only mesh correctly if they are fitted to parallel axles. Worm Gear A worm is a gear that resembles a screw. It is a type of helical gear, but its helixangle is usually somewhat large (that is, close to 90 degrees) and its body is usuallyfairly long in the axial direction; and it is these attributes that give it its screwlikequalities. A worm is usually meshed with an ordinary looking, disk-shaped gear,which is called the gear,  the wheel,  the worm gear,  or the worm wheel.  The primefeature of a worm-and-gear set is that it allows the attainment of a high gear ratiowith few parts in a small space.  Required Supplies and Software   The following supplies and software are used in Unit 6: Gears, Chains, and Sprockets:  Supplies   Software  VEX Classroom Lab Kit Autodesk® Inventor® Professional 2011 Notebook and pen One assembled VEX motor test stand from theUnit 5: Speed, Power, Torque, and DC Motors >Build Phase.   4      Autodesk's VEX Robotics Unit 6: Gears, Chains, and Sprockets    Supplies   Software  An assembled the gear ratio test stand fromthe Unit 6: Gears, Chains, and Sprockets > BuildPhase. Small storage container for loose parts Work surface 5 lb. weight A surface (for example, a table or desk) with anedge at least 24” above the ground One stopwatch  VEX Parts  The following VEX parts are used in Unit 6: Gears, Chains, and Sprockets > Build Phase:  Quantity   Part Number   Abbreviations  5 BEARING-FLAT BF 10 NUT-832-KEPS NK 10 SCREW-832-0500 S4 2 SHAFT-3000 SQ3 2 SHAFT-COLLAR COL 1 SPACER-THICK SP2 1 SPACER-THIN SP1 1 VEX-12-TOOTH-GEAR G12 1 VEX-84-TOOTH-GEAR G84 2 WASHER-DELRIN WP 

2:13-cv-00922 #67

Jul 23, 2017

2:13-cv-00922 #68

Jul 23, 2017
We Need Your Support
Thank you for visiting our website and your interest in our free products and services. We are nonprofit website to share and download documents. To the running of this website, we need your help to support us.

Thanks to everyone for your continued support.

No, Thanks