BASE TANGENT LENGTH OF DOUBLE HELICAL GEAR 1

[1234910]

HOW TO FIND BASE TANGENT LENGTH OF DOUBLE HELICAL GEAR WITH 199 TEETH .NORMAl module - 8 , pressure angle - 20 degrees , formula and calculation
thanks

 

[gearcutter]

Equations & examples can be found here -

http://www.geartechnology.com/issues/0186x/colbourne.pdf

https://www.engineersedge.com/gears/externalgears.pdf

 

[1234910]

THANKS

 

[tbuelna]

Make sure you account for any profile modifications, backlash, etc used in the gear. Some high-performance DH gears have different profile tolerance limits for the drive and coast side tooth faces, which you would need to take into account. With a 199T gear it would also be a good idea to take several measurements around the gear circumference.

 

[1234910]

YES it's a corrected gear , with addendum modification coeff as = 0.33