02-07-2017, 02:47 PM
(This post was last modified: 02-07-2017, 03:06 PM by Bill Gruby.)
I always get upset whenever the Industry Standard is questioned. Those numbers have been around since the changeover from cast gears to cut gears was done. Find a Fellows Gear Shaper Co. Book called The Involute Gear. All you need to know is in there.
The numbers I cited are for a 14.5 pitch angle. Pratt & Whitney developed the system in the 1920's A pitch angle and a module number are two completely different animals. That is why they are not interchangeable.
"Billy G"
The numbers I cited are for a 14.5 pitch angle. Pratt & Whitney developed the system in the 1920's A pitch angle and a module number are two completely different animals. That is why they are not interchangeable.
"Billy G"