Bevel/Miter Gear Mounting Distances

[GeeTwo]

Originally Posted by mrwright

Ok. I see the drawing file and the distances listed. I can see that the bevel gears are 12 DP gears so 15 teeth divided by 12 gives me 1.25 in. for the mounting distances.

Do the same rules for spur gear mounting distances apply to bevel and miter gears as well?

For example, if I wanted to use a bevel gear with a 15 tooth input and a 30 tooth output and they were both 12 DP gears would my mounting distance be:

15 / 12 = 1.25
30 /12 = 2.5

Mounting distance = 3.75

Is that correct?

No, each gear mounts the appropriate distance from the inside corner for the number of teeth it has. If you were to "unfold" the box, you would have the sum of these two distances (plus the fold itself) as the distance between the holes. The "pitch cone" of each gear should intersect the inside corner of the gearbox at the same point, and those two cones should share a line where they are tangent to each other.