# Re: HOW TO FIND ROLL GEARS FOR GLEASON 104

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Posted by Don P on October 30, 2012 at 08:02:15:

In Reply to: Re: HOW TO FIND ROLL GEARS FOR GLEASON 104 posted by HITESH PARAJIYA on October 24, 2012 at 23:36:32:

The ratio of roll gears depend on both the pressure angle of the part and, the pressure angle of the cutter.This is designated as K1.
K1 = (cos pr.angleof the part/cos pr angle of cutter)
Nc/2 = ((DP)(Ao)/(K1)). If Nc/2 is less than 15,
the selection constant is 25.Above 15 the constant is 50.
The decimal ratio is as follows,
(2.0(Nc/2)/selection constant)) = decimal ratio.
If Nc/2 is 15 or less, change selection gear
in the cradle roll .Look at chart on cradle roll gear door for details.
If you don't have the selection gear, Nc25 ratio
divided by 2 = Nc50 ratio.
I hope this helps
Dogballz99

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