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 Initial
Design
I began by creating 3D CAD drawings of my concept bot, Boomerang.
It will be a 4 wheeled bot totally enclosed with a modular weapon
system (Saw, Ram, or Air Hammer). Hopefully this design will get
me in the Middleweight division in Battlebots
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also created a 3D render of the frame, all parts were cut in 1/8
steel plate by Greenheck Fan
(where I work) and AP Laser
in Wausau, WI.
For the drive train I used 2 off-set motors, that were used for
Electric scooters,  12
volt purchased from MECI. You can see a image of them off to the
right. These are two 12 volt motors, with a spur gear connecting
in the middle. Nice setup for my first time bot, both motors in
a nice housing. This will create a friction drive for each wheel.
The nice thing about this setup is the built in redundancy, one
motor in each set can die and the wheel still turns. On the prototype
bot in 24 volt mode we estimate its speed to be around 18-20 MPH!
Very fast and very, very, very smooth.
For wheels I used 8" castor wheels, extra soft for good traction.
The prototype bot has some cheap lawn mower wheels I bought at the
local Menards.
Final wheels are nice and strong, with a rating of 350 lbs per wheel,
and a very rugged roller bearing on the 1/2" shaft. With the drive
system I am making it is necessary for the wheel to be move freely
on the axle.
Speaking of axles, I just used some stainless steel 1/2" lag bolts
and a special combination of washers and lock nuts to center the
wheel on the shaft. Pretty basic, but it does the job.
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