[Frank(Aflak)]

We need to build custom gearboxes . . and I am put in charge of getting a basic sketch down. I have one using smallparts carbon-steel gears and sprockets, the Atwood/Chiaphuas, and the Bosch drillmotors and transmissions.

the thing is, using the sprokets and gears from small parts, my ratios are off by about .02:1 . .

like, I want one to be 1.3:1, best I can get is 1.28:1

Is this a problem, will my motors burn up if they are out of ration by 1 or 2 percent (ratios for both motors are a bit low, so maybe just <1%)?

Also, whats a reasonable speed/force? My current design gives us 10 m/s and about 350-400 Newtons (200-250 up the ramp)

I have no idea about efficiency either, so I just random-guessed 60%. This is high or low?

Im using Bosch to transmission to one gear-gear connection, then to the sprockets to drive the wheels, and Chip/Atw. to gear-gear connection to sprocket to wheels. Can I hope for higher efficiency? All parts are from smallparts with a total materials tab of ~$215.00, not including the chain or housing materials or axels, just gears and sprockets.

#%#%#%#%, we are really jumping into this. I have never designed a drivetrain in my life . . and our moderator says "Ok, so why don't you sketch out a drivetrain and chassis for us and bring it in thursday or friday. Ok, greeaaat. And Bob, could you sketch out the bulldozer arms?"

I always get the hard part.