Gears, Chains, and Sprockets - VEX Robotics

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To find gear ratio, you need to count the number of teeth on the driven gear and divide it by thenumber of teeth on the driving gear. See the examples in the diagram below.12■Unit 6: Gears, Chains, and Sprockets
Idler GearsGears can be inserted between the driving and driven gears. These are called idler gears, and they haveno effect on the robot’s gear ratio because their gear ratio contributions always cancel themselves out(because they are a driven gear relative to the first gear, and a driving gear relative to the last gear—you first multiply by the number of teeth on the idler gear and then divide by the same number, whichalways cancels out).However, idler gears do reverse the direction of rotation. Normally, the driving gear and the drivengear turn in opposite directions. Adding an idler gear makes them turn in the same direction. Addinga second idler gear makes them turn in opposite directions again. Idler gears are typically used eitherto reverse the direction of spin between two gears or to transmit force from one gear to another gearfar away (by using multiple idler gears to physically bridge the gap).Think Phase■13
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: The driving torque applies some for
Page 15 and 16: Compound Gear RatioCompound gears a
Page 17 and 18: Chain DrivesSprockets and chains ar
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

Gears, Chains, and Sprockets - VEX Robotics

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