need help double checking motor selection lecture notes
 

I just finished editing the lecture notes for a motor selection workshop I did earlier this year, and I am planning to put it in the White paper section. But I need help double checking it before I do that.

The difference between this note and the old lecture note in white paper is that this one have more detailed explaination of everything, so its easier for rookies to understand concepts like power and gear ratio. This one also have my updated contact info.

Special thanks to Joe J. and Mike C. of team 47 Chief Delphi, and Andy Baker from team 45 Technokats, and many posters from Chief Delphi forum for making this possible!!!

Please point out any errors or unclear parts in this lecture note. Also, if you have any suggestions of what else should be include, feel free to suggest them. Thanks!

I attached the document file to this reply.

Ill read it tonight. It looks good.:) If I can print out grrr. Stupid computer.

Very good, Ken.

If you don't mind, I'd like to distribute it to our younger team members, as it provides a clear, concise explanation of a lot of what I'd like them to know - and in a better way than I could ever do it.

The only point of confusion for me was regarding the efficiencies of different methods of transfering mechanical power . . .

Wouldn't the power lost be 5-10% in the case of spur gears, etc.?

That is, they're 90% percent efficient, with a potential power loss of 10%?

That was confusing to me and maybe others. Otherwise, it's great.

Ah ha! I knew I screwed up some where. It really should've said "Power transferred for each stage of different small parts after losses in friction, heat, etc.". So for Spur gears, they have a 90~95% efficiency because they lost 5~10% in the power transfer. Thanks!

Once I finish double checking the paper (that's why more of you should read it to make sure there's no error in it), I will post it in white paper, then everyone can download it and distribute it to their team members. Then tell them to read it at home and hope that the paper actually make sense and might teach the students something about motors and gears ;). I really hope this is useful to everyone.

Wow, that was quite possibly the most helpful thing I have ever read. I have been looking for some good documentation on motor choice and gear ratio for weeks now, and man you hit it right on the head. That was awesome, I learned so much. Thanks Ken for another enlightening experience.