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Components Of Gear Box Inspection

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OBJECTIVE: Is to do a Gear Box Inspection, determine the type of Gear and profile of gear sets, and take the dimension and measurement of the gear sets, likewise checking for backlash and gear mesh
EQUIPMENT/TOOLS USED FOR INSPECTION: Micrometer screw gauge, dial indicator, Allen keys, Vernier caliper, gear or Pitch gauge, bevel protractor
INTRODUCTION
The type of Gear in this unit is a Worm Gear which comprises of a worm and Worm wheel
A Worm Gear is a type of gear with a mechanical arrangement which has a toothed wheel worked by a short revolving cylinder called a worm bearing a screw thread. The gear consists of a shaft with a spiral thread that engages with and drives a toothed wheel
Profile of the Gear: A worm and its mating worm gear operate or transmit motion and power between non intersecting shafts that are at 90o to each other. A large speed reduction ratio compared to other types of gears is typically achieved. The worm is the driver, and the worm gear is the driven gear. The teeth on the worm appear similar to screw threads, and are referred to as threads rather than teeth.
The gear drive has a worm on the high speed shaft which has the general appearance of a power screw thread such as a cylindrical, helical thread.
Worms and worm gears can be provided with either right-hand or left-hand threads on the worm. Gears that also have a helix angle can be either right hand or left hand.
If the teeth point to the right, as viewed from the shaft axis of the

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