Fine pitch gears and Small gearboxes


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We gathered various knowledge about gears into our Technical Data for our customers to properly design, select and use gears.

It contains comprehensive knowledge of gear terminology, how to use and measure gears, accuracy grade of gears, calculation formula of dimensions and strength of gears.

We hope it will be a textbook of gears for those who would like to desigh, use or study gears.
You can download both complete and separate version of each chapter from the following table.

Chapter 1
Basic Knowledge of Gears
1.1 Gear history PDF
1.2 Types of Gear PDF
1.3 Types of Tooth profiles curves PDF
1.4 Terminology of each part of the gear PDF
1.5 Fundamental dimensions for various sizes of Tooth profile PDF
1.6 Features of common gear PDF
1.7 Backlash PDF
1.8 Rack shift of the gear PDF
1.9 Contact ratio and Special sliding PDF
1.10 Tooth profile modification PDF
Chapter 2
Precaution for usage
2.1 Precaution of usage for Helical gear PDF
2.2 Precaution of usage for Bevel gear PDF
2.3 Precaution of usage for Worm gear pair PDF
2.4 Precaution of usage for Anti backlash spur gears PDF
2.5 Precaution of usage for B-BOX PDF
2.6 Precaution of usage for B-SET PDF
2.7 Locking fixture for gear shaft PDF
Chapter 3
Gear material and Heat treatment
3.1 Selecting gear material PDF
3.2 Heat treatments PDF
3.3 Gear materials and Heat treatments PDF
Chapter 4
Measurement for Tooth thickness
4.1 Method of measurement for Sector span PDF
4.2 Method of measurement with Over balls or Rollers PDF
4.3 Measurement method with Gear tooth vernier PDF
Chapter 5
Deviation for Gear and its
measurement method
5.1 Correlation of deviations PDF
5.2 Tooth profile deviations PDF
5.3 Helix deviations PDF
5.4 Pitch deviations PDF
5.5 Runout PDF
5.6 Radial composite deviation PDF
5.7 Precision of Spur and Helical gears PDF
Chapter 6
Gear assembly
6.1 Advice on Gear Assembly PDF
6.2 Centre distance for Spur and Helical gears PDF
6.3 Parallelism of axes for Spur and Helical gears PDF
6.4 Tooth bearings PDF
6.5 Lubricating oil for Gears PDF
6.6 Lubricating oil PDF
Chapter 7
Oscillation and Noise level for Gear
7.1 Cause and solution for noise and oscillation PDF
7.2 Analyze the cause of noise by frequency constituent
(Low frequency zone)
Chapter 8
Gear damage
Gear damage PDF
Chapter 9
Calculations for types of gear
9.1 Calculation for Standard spur gear PDF
9.2 Calculation for Standard internal gear PDF
9.3 Calculation for Normal standard helical gear PDF
9.4 Calculation for Crossed helical gear (Screw gear) PDF
9.5 Calculation for Worm gear pair PDF
9.6 Calculation for Gleason system Straight bevel gear PDF
9.7 Calculation for Standard straight bevel gear PDF
Standard angular stragiht bevel gear PDF
9.8 Calculation for Gleason system spiral bevel gear PDF
9.9 Calculation for Planetary gear mechanism PDF
9.10 Calculation for tyeps of Gear PDF
9.11 Gear efficiency PDF
Chapter 10
Calculation for Gear strength
10.1 Calculation of strength for Spur and Helical gears PDF
10.2 Calculation ofor Bevel gear strenght PDF
10.3 Calculation for Cylindrical worm gear pair strength PDF
Reference data Conversion table for SI units (System International Units) PDF
Hardness conversion table PDF
Commonly used fitting tolerances for bore dimensions PDF
Involute function PDF
Metric coarse and Fine screw threads PDF
Spot facing and Thread hole for Hexagon socket head cap screws PDF
Parallel key and Key Way PDF
Centre bore PDF


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