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Thanks again Mike, I appreciate you kindness and time. Sorry it took so long. I've been reading furiously to figure this out on my own and I appreciate your (and everyone else here) advice.

Thanks Mike, I'm not at all concerned that this will explode. The loads are so light I don't think there's much chance of that happening. My main concern is efficiency. I only need about .2 millinewtons of force out at the Sun. I could easily do this with a simple inline compound train but I...

Mike, As you said, it should be obvious what is driving this and what the load is. :) Just re-read your own post. :) Terry, Thanks for the tips. I have a profile shift on the sun and mating wheels to get rid of the interference but I'm not sure I understand what you mean by tip mods and...

BTW, I just need a bit of help understanding the order to go about this and what parameters I need to solve for. I understand how to find the efficiency of a simple epicyclic but this is over my head right now.

I'm having a bit of difficulty figuring out the theoretical efficiency of a compound epicyclic gear train. The math involved is a bit over my head. This train is meant to run at very slow speed under light load. I want to find the theoretical efficiency of the design so I can determine if it is...

Thank you Ted, I understand now. This is actually a small part of a larger more complex compound stage epicyclic train. I was trying to find a simple expression to isolate the ratio between these to gears but now I understand I have to step through the entire train to get this ratio. What a...

I guess I wasn't being clear in my description. Lets say I have a Carrier arm with one planet driving the annulus. How do I find the ratio between the carrier arm and the ring? I tried using conventional formulas to find the ratio but I'm having difficulty because this would mean that none of...

I've searched high and low and can't seem to find the formula for an epicyclic gear train where the carrier arm is the input, the ring is the output and there is no sun gear. Any ideas?

Thank you, exactly what I needed. Simulation works perfectly.

Hello, I'm designing a planet gear with an output of 4:1. Here are the details; Sun = 24 teeth, Planet = 24 teeth, Ring = 72 teeth. The sun is the input, planet carrier is the output. My question is what is the formula for finding the output of the planets gears themselves? For example, for...