involute gears
involute gears
(OP)
I am in the process of inspecting some 1st articles. I am not that familiar with gear design but the gear spec on one of the prints I have doesnt seem right.I have a pitch diameter of 2.0625 on a gear that has 72 teeth and then a diametral pitch callout of 32. I thought the diametral pitch was calculated by dividing the pitch dia by the number of teeth. Now in the gear spec on the print for the mating part there is no diametral pitch callout but there is a circular pitch callout of 32 on a pitch dia of 2.250. Maybe this is correct and my limited knowledge is getting in the way.
Thanks.
Thanks.





RE: involute gears
You are correct - standard PD = Z / DP.
There's no such thing as 32CP.
Ron Volmershausen
Brunkerville Engineering
Newcastle Australia
http://www.aussieweb.com.au/email.aspx?id=1194181
RE: involute gears
Thanks
1. DIAMETRAL PITCH: 32
2. PRESSURE ANGLE = 20.0DEG
3. NUMBER OF TEETH: 32/66
4. PITCH DIAMETER: 1.000/2.0625
5. OUTSIDE DIAMETER: 1.0625/2.125
6. TOOTH DESIGN: INVOLUTE CURVE
7. QUALITY CLASS: AGMA Q10
1. PITCH DIAMETER = 2.250
2. OUTSIDE DIAMETER = 2.312
3. PRESSURE ANGLE = 20.0DEG
4. N = 72 TEETH ON FULL CIRCLE
5. N= 25 TEETH ON SECTION
6. CIRCULAR PITCH = 32
7. TOOTH DESIGN = INVOLUTE CURVE
8. AGMS = CLASS 76
RE: involute gears
RE: involute gears
RE: involute gears
Forgive me for my lack of knowledge on the subject but the designer is no longer with our company and there is no body else here who understands gears.
RE: involute gears
RE: involute gears
Z/dp yields 66/32 and 32/32 yields the 2.0625 and 1.000 pitch diameters.
72/32 yields the 2.500 pitch diameter.
25/32 yields .78125 pitch diameter.
RE: involute gears
The only exception is the value shown for circular pitch. circular pitch = Pi / diametral pitch .