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Re: Gear Ratios
For bearings, unless you can get them somewhere cheaper (<$4 each), I'd recommend Small Parts p/n brf-08 (1/2" ID) and brf-06 (3/8" ID) You won't find them in their catalog but if you do a p/n search on their website you will.
For gears, at first I was shocked at how large they were but I took a look at your design and did a few numbers on the clearances and center to center distances and whatnot and it seems like you've got it pretty well figured out. You'll be able to take a lot of meat out of the gears and save a lot of space. You might take a look at Martin gears part numbers S20XX (3/8" face width, 14.5 degree PA) and TS20XX (1/2" face width, 20 degree PA) where the XX is the tooth count. You can order them from Motion Industries (who has a store local to you (afaik) 1310 MILLER PARK WAY, MILWAUKEE , WI, 53214 -3603, Phone: (414) 649-2400
Now, I haven't looked at the Berg gears but the Martin gears have thick heavy hubs that you'll definitely want to machine away most of.
You can also take a look at McMaster to see what gears they have. I don't think they have the 70 tooth.
Also, make sure you get a bore small enough on the CIM motor gear, but you probably already knew that.
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Teacher/Engineer/Machinist - Team 696 Circuit Breakers, 2011 - Present
Mentor/Engineer/Machinist, Team 968 RAWC, 2007-2010
Technical Mentor, Team 696 Circuit Breakers, 2005-2007
Student Mechanical Leader and Driver, Team 696 Circuit Breakers, 2002-2004
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