The Tamiya #70097 twin-motor gearbox is a small
(3in long) plastic gearbox. It contains two small DC motors that drive
separate 3mm hexagonal output shafts. There are two ways to put the kit
together: with a high-speed 58:1 gear ratio or with a slower 203:1 gear
ratio. Either way, the motors provide plenty of power to drive any small
robot. The gearbox works perfectly with our micro
dual serial motor controller.
The two motors in the twin-motor gearbox are
rated for 3 volts but will typically work fine up to 6 volts. When using
this product with the dual serial motor controller (or any motor driver
based on an H-bridge), keep in mind that up to a few volts (depending on
the load) are lost on the transistors of the H-bridge, so that a 4.5
volt battery delivers about 3 volts to the motors, giving them a
reasonable amount of power. Motor overheating can be caused by excessive
stalling, even at very low voltages. We recommend that you use
stall-detection sensors, or just watch your robot, to make sure that it
doesn't stall for more than a few seconds at a time.
The 3mm, hexagonal output shaft is compatible
with all four types of Tamiya wheels.
|Note: The twin-motor gearbox is
a kit; assembly is required. To use the kit in robotics
projects, you need to connect the motors to your own robot
controller. Motor is FA130, 3V (Max 4.5V)/0.5A, 10500 RPM. Click here
to compare these gearboxes.