Basics of Gear Metrology

Gears are transmitted power and motion in industries and machines, mainly used for torque multiplication.

Gear also increase or decrease the speed of any system.

gear train
Photo by Flickr on Pexels.com

This is widely used in machine tools, transmission, automobile-like mechanical motion devices.

The purpose of a gear wheel is to transmit rotary motion and force. A gear wheel with accurately machined teeth round its edge.

colorful gears
Photo by Digital Buggu on Pexels.com

A shaft passes through its center and the gear may be geared to the shaft. Gears are used in groups of two or more, which is known as a gear train.   

Types of Gears

Bevel gears

These gears have teeth cut one cone instead of a cylinder blank. Bevel gears are used in pairs to transmit rotary motion and torque.

Which are 90 degrees to each other.  

By Diego Delso, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=18836416
By Diego Delso, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=18836416

Worm and Worm Wheel

A gear which has one tooth is known as Worm, this tooth in the form of a screw thread. A worm wheel meshes with the worm .

By Arthur Clarke at English Wikipedia - Transferred from en.wikipedia to Commons., Public Domain, https://commons.wikimedia.org/w/index.php?curid=2851216
By Arthur Clarke at English Wikipedia – Transferred from en.wikipedia to Commons., Public Domain, https://commons.wikimedia.org/w/index.php?curid=2851216

Helical Gear

Helical gear used for very quiet and smooth running at high rotational Velocities.

helical gear
By Arthur Clarke at English Wikipedia – Transferred from en.wikipedia to Commons., Public Domain, https://commons.wikimedia.org/w/index.php?curid=2738668

Spiral Bevel Gears

These gears used where necessary to transmit quietly and smoothly a large torque through a right angle at high velocities.

spiral bevel gear
By Myriam Thyes – Own work, Public Domain, https://commons.wikimedia.org/w/index.php?curid=4078185

Rack and Pinion

Rack and Pinion are used for converting rotary motion to linear motion.

rack and pinion
By OSHA Directorate of Technical Support and Emergency Management – Point of Contact Between a Rack and Pinion. The original uploader was Brian0918 at English Wikipedia., Public Domain, https://commons.wikimedia.org/w/index.php?curid=186765

Spur Gears

This type of gear is widely used today. A spur gear, transmit a positive motion between two shafts lying parallel to each other.  

Every gear rotates about its axis. So, all parameter have to be inspected about the axis of rotation.

spur gear
Photo by Pixabay on Pexels.com

Tooth gear Measurement  

  1. Gear tooth Vernier
  2. Flange Micrometer
  3. Gear rolling Tester

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