Spur Gear Full Depth Tooth Calculations


Basic Rack Of The 14.5° Full Depth Involute System


Basic Rack Of The 20° Full Depth Involute System

To Find

Diametral Pitch Known

Circular Pitch Known

Addendum

=1 / Diametral Pitch

=0.3183 X Circular Pitch

Minimum Dedendum

=1.157 / Diametral Pitch

=0.3683 X Circular Pitch

Working Depth

=2 / Diametral Pitch

=0.6366 X Circular Pitch

Minimum Total Depth

=2.157 / Diametral Pitch

=0.6866 X Circular Pitch

Basic Tooth Thickness
On Pitch Line

=1.5708 / Diametral Pitch

=0.5 X Circular Pitch

Minimum Clearance

=0.157 / Diametral Pitch

=0.05 X Circular Pitch

 

Note: Radius of Fillet = 1-1/3 X Clearance for 14-1/2° full depth tooth and 1-1/2 X Clearance for 20° full depth tooth.

Note: The term Diametral Pitch is used up to 1 DP inclusive and the term Circular Pitch is used for 3 inches circular pitch and over. A suitable working tolerance should be considered in connection with all minimum recommendations. Minimum clearance between the top of the gear tooth and the bottom of the mating gear is specified as “minimum” so as to allow for necessary cutter clearance for all methods of producing gears.


| Home |  | Technical |  | Materials |  | Resources |  | Contact Us |  | Drawings |  | Downloads |

All information contained on this site is for informational purposes only. This information should be independently verified prior to using it on any project. Gears And Stuff accept no liability in the use of this information.

All Rights Reserved ©  2006 Gears And Stuff

If you experience any difficulty with this site, please contact us at steve@rescomservice.net