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Step 3Drive motors, choosing.
Segstick uses two DeWalt DC759 18V cordless drills as drive motors. Cordless drills are great because you get a motor, a gearbox, and a way to couple to the drive shaft together in one package. They are also available cheaply on eBay used or without the battery, charger, and case.
Cordless drills are not so great because the chuck often has a lot of backlash, which makes controlling the vehicle difficult. I've been informed that some low-end drills actually have less backlash because they don't have an anti-backdrive feature on the chuck. You might also be more willing to sacrifice a cheap drill like this than a nice, working DeWalt.
Another option is to use gearmotors from the robotics market, such as the BaneBots P80. You can see these deployed on our first balancing vehicle, as well as Charles Guan's Segfault. These gearboxes give you considerably more gear ratio options (12:1, 16:1, 27:1) and will have less backlash than the DeWalts. The downsides are a higher price and more fabrication required for mounting and attaching a wheel.
Cordless drills are not so great because the chuck often has a lot of backlash, which makes controlling the vehicle difficult. I've been informed that some low-end drills actually have less backlash because they don't have an anti-backdrive feature on the chuck. You might also be more willing to sacrifice a cheap drill like this than a nice, working DeWalt.
Another option is to use gearmotors from the robotics market, such as the BaneBots P80. You can see these deployed on our first balancing vehicle, as well as Charles Guan's Segfault. These gearboxes give you considerably more gear ratio options (12:1, 16:1, 27:1) and will have less backlash than the DeWalts. The downsides are a higher price and more fabrication required for mounting and attaching a wheel.
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