METAL CUTTING: Gears

METAL CUTTING: Gears

1. Transmit power from one shaft to another by means of successively engaging teeth in two of more gears

2. Milling machines can be used to repair or produce gears

   • not economic

3. BASIC SPUR GEAR GEOMETRY

   • Centre distance of two gears
   • Pitch circle diameters
   • size of teeth
   • number of teeth
   • pressure angle of the contacting teeth

4. CUTTING GEARS

   • Cutting uses a rack/pinion shaped cutter
     • cutter reciprocates vertically
   • Bevel gear cut by one or two cutters

5. STRAIN WAVE GEARING

   • harmonic drives widely used in
     • industrial motion control
     • robotics
     • aerospace
   • high gear ratio
   • compact size
   • minimum backlash

6. Non - circular gears

   • Biopace
   • Oval gear flow metre
   • Axle displacement
     • using oval gears

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