Hi, folks.
Not a credentialed engineer, but I invent/build stuff and have managed to teach myself enough to be pretty useful. Unfortunately I've run into the limits of my knowledge, and Google is not proving to be super helpful in providing edumacation on this one. I'm hoping someone here can help:
I want to put a gear on the output shaft of an electric motor, connect it to a reduction gear on a layshaft, and then further reduce it through another pair of gears to a driven shaft colinear with the motor's output shaft that will drive a propeller. (Building an underwater propulsion unit.)
To get the reduction where I want it, my default choice would be a 15T gear on the motor driving a 23T gear on the layshaft, and then a 15T gear on the layshaft driving a 23T gear on the driven shaft. (About a 60% overall reduction.)
The motor puts out about 750W at 2500RPM.
For size / weight / cost / environmental reasons, my preference would be to go with 20DP, 14.5PA gears made of Delrin.
What I don’t know how to calculate is the safe power transmission capability of that gear train. Am I going to strip teeth if I put that much power through them? How do I calculate the safe load for gears of different tooth parameters / materials?
Usually I can google around and find the math for these kinds of calcs, but I’m finding this one tricky. Any guidance would be MUCH appreciated.
-Ben