Our machine shop has also been re-located as part of the business move to Rugby, we anticipate the machines will be operational around mid December. Orders placed which include custom bore sizes and tapped holes will be processed as soon as the machines are spinning again.
The 3-speed crank-axle gearbox looks very much like half of the twin-motor gearbox; it even uses the same gears. This compact gearbox gives you options for gear ratios of 17:1, 58:1, and 204:1. This is Tamiya's cheapest, general-purpose gearbox.
The motor is 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: This gearbox uses the 18100 motor variant)
See 'Which Wheel' tab for suitable wheels type HEX for a tight fit.
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