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Main Data

  • Description: Grinding mill girth gear
  • GEARX No.: SG30-232RG
  • Normal module: 30 mm
  • No. of teeth: 232
  • Pressure angle: 20°
  • Helical angle: 13°
  • Helical hand: Right
  • Material: GB ZG45CrMo
  • Heat treatment: Quenching and tempering
  • Tooth hardness: HB270-320
  • Tip Diameter: 7,061.935 mm
  • Reference diameter: 7,031.935 mm
  • Root diameter: 6,956.935 mm
  • Face width: 800 mm
  • Tooth surface finish: Ground
  • Accuracy grade: DIN5
  • Blank weight: 63,183 kg
  • Weight: 30,591 kg


  • Grinding mills

The Main Fabrication Procedure

  • Casting the girth gear blank.
  • Rough machining
  • Ultrasonic inspection
  • Quenching and tempering to HB270-320
  • Combining the 2 semi girth gear blank into a single entity.
  • Turning the gear.
  • Hobbing
  • Dimensional (run out) and quality test of the hobbing
  • Grinding
  • Inspection magnetic inspection the tooth flank, and then magnet demagnetization
  • Packaging and delivery to the customer

Technical Documents

  • Inspection certificate of material
  • Heat treatment certificate
  • Certificate of ultrasonic inspection
  • Magnetic particle detection certificate(on tooth flank)
  • Size tolerance and geometric tolerance report
  • Inspection report of tooth quality

Relative Standards

  • ANSI/AGMA 6004-F88 Gear Power Rating for Cylindrical Grinding Mills, Kilns, Coolers and Dryers
  • I SO 6336 Calculation of load capacity of spur and helical gears
  • DIN 3990 Calculation of load capacity of cylindrical gears