Circular to chordal tooth thickness. 1

[trallee]

What is the equation for converting the circular tooth thickness to chordal tooth thickness. I know it is something simple but I cannot find it or remember what it is.

Thanks for any help.

Troy

 

[dimjim]

pi D is the circumference which is equal to 360 degrees.
You have to find the angle that the arc represents
Then take the sin of 1/2 the angle times the pitch
diameter.

 

[lbmakem]

hi
ch-add= addendum+(tth^2 / (4xpcd))
ch-th= pcd x sine(90 / teeth)

 

[dimjim]

lbmakem,
You have to take the backlash into consideration which is
not in your formula.