Gears, Chains, and Sprockets - VEX Robotics

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The compound gear ratio between the driven and driving gears is then calculated by multiplying thegear ratios of each of the individual gear pairs.Compound gears allow configurations with gear ratios that would not normally be achievable withthe components available. In the example above, a compound gear ratio of 1:25 was achieved usingonly 12 and 60-tooth gears. This would give your robot the ability to turn an axle 25 times faster thannormal (though it would only turn with 1/25th of the torque)!Gearing DesignYou can see how by using gear ratios you can affect the amount of loading applied to a motor by amechanism. This is extremely important for mechanism design, because it is rare that the output of amotor is perfectly suited for a given application. As discussed in Unit 5: Speed, Power, Torque and DCMotors, the loading on the motor must be adjusted using gear to optimize system performance.16■Unit 6: Gears, Chains, and Sprockets
Chain DrivesSprockets and chains are commonly used in applications where torque is needed to be transferredover longer distances than allowed by gears. Unlike spur gears, all of the sprockets in a chain driverotate in the same direction.Chain DrivesRoller chain is the most commonly used type of chain and has been in use since its invention late inthe 19th century. It typically consists of rollers cushioned by bushings held in place by pins. These inturn are held in place by a set of roller link plates that are sandwiched between two link plates. Youcan find roller chains on bicycles and industrial machinery. Although very common, roller chainsrequire constant lubrication and maintenance. Simpler cheaper versions without the bushings exist,but they are less durable and are reserved for less critical uses.Chains elongate while they are used so they must have some kind of adjustment or a convenient wayto remove links to maintain proper tension. Roller chains incorporate a “master link” that can beremoved easily to remove links. Most chain-drive mechanisms have some sort of tensioning devicethat can be adjusted without interrupting the operation of the device.Think Phase■17
Page 3 and 4: SuppliesSoftwareAn assembled the ge
Page 5 and 6: PhaseBuildStandardScience (NSES)Uni
Page 7 and 8: Think PhaseOverviewThis phase expla
Page 9 and 10: Spur GearsSpur gears have been used
Page 11 and 12: The driving torque applies some for
Page 13 and 14: Idler GearsGears can be inserted be
Page 15: Compound Gear RatioCompound gears a
Page 19 and 20: Create PhaseOverviewThis phase desc
Page 21 and 22: Icon Name DescriptionRectangularPat
Page 23 and 24: Example: Generated GearsIn the foll
Page 25 and 26: Enter data to design the gear set.I
Page 27 and 28: Exercise: Generate Spur GearsIn thi
Page 29 and 30: 12. To check your design again, cli
Page 31 and 32: 9. Press E to start the Extrude too
Page 33 and 34: 4. For Operation, select Cut.2. Exp
Page 35 and 36: 14. Click OK.3. Click again to crea
Page 37 and 38: Extrude the Sketch on the Back Face
Page 39 and 40: 7. For Count, enter 5.8. For Spacin
Page 41 and 42: Insert an iFeatureIn this section o
Page 43 and 44: Exercise: Animate a Gear AssemblyIn
Page 45 and 46: 9. Scroll back to SHAFT-3000:5. Rig
Page 47 and 48: Required Supplies and SoftwareThe f
Page 49 and 50: 2. To complete the next step:■■
Page 51 and 52: 4. To complete the next step:■■
Page 53 and 54: Amaze PhaseOverviewIn this phase, y
Page 55 and 56: f. Set up the test stand between tw
Page 57 and 58: Figure 4: 36:60 ReductionFigure 5:
Page 59 and 60: STEM ConnectionsBackgroundThe Unite

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