Tamiya 70203 Low-Current Motor Gearbox (3-Speed)

This gearbox features a low-current brushed DC motor, which is great for projects where you want to keep your power consumption to a minimum. Its single gear train can be assembled to have one of three gear ratios: 12.7:1, 38.2:1, or 114.7:1.

AUD$ 29.95

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Our Code: SKU-003088

Supplier Link: [Pololu MPN:2196]

Description

Overview

The Tamiya 70203 Low-Current Motor Gearbox kit includes one brushed DC motor and all the gears and parts to build any of the three possible gear ratio configurations: 12.7:1, 38.2:1, 114.7:1. The three gear ratio options give you the flexibility to choose the best speed and torque for your project.

Tamiya 70203 low-current gearbox kit

The kit includes step-by-step illustrated instructions in both Japanese and English. A scanned copy of the instructions is available on the Pictures tab. The kit can be built with just a screwdriver, but the instructions recommend having side cutters and a modelling knife on hand.

Complementary products

The output shaft included in this kit is a 3 mm hexagonal axle that is 10 cm (about 4″) from tip to tip. The axle works with many of the Tamiya wheels we carry. The low-voltage motor runs on 0.5 V to 3 V and draws less than 1 A, making it a perfect candidate for the DRV8835 or the DRV8833 motor driver carrier. The mounting holes on the gearbox are compatible with the Tamiya 70098 universal plate set and other Tamiya construction series products

Features

Free-Run Speed @ 3 V: see picture to the right for RPM table
Tamiya 70203 low-current gearbox torque and RPM at 3 V.
Free-run current @ 3 V: 20 mA
Stall current @ 3 V: 670 mA
Torque @ 3 V: see picture to the right for torque table
Three different gear ratios:
- 12.7:1
- 38.2:1
- 114.7:1
3 mm hexagonal output shaft (length: 100 mm) compatible with our adaptor for LEGO wheels and many of Tamiya’s wheels
Two mounting orientations
Transparent gear housing shows the internal mechanisms
Crank plates


Tamiya 70203 low-current gearbox torque and RPM at 3 V.

Note: The Tamiya 70203 Low-Current Motor Gearbox is a kit; assembly is required.

Specifications

General specifications

Typical operating voltage:	3 V
Gear ratio options:	12.7, 38.2, 114.7 :1
Free-run current @ 3V:	20 mA¹
Stall current @ 3V:	670 mA
Colour:	clear

Notes:

1: This is the no-load current of the motor when disconnected from the gears in the gearbox; the no-load current of the entire gearbox with the motor connected will be slightly higher and will vary depending on the gear ratio.

FAQs

Does this gearbox come with motors?: Yes, motors are included with the Tamiya gearbox kits.
How do I order the correct gear ratio for this gearbox?: The Tamiya gearbox kits come with all of the gears and parts necessary to build the gearbox in any of the possible gear ratio configurations.
Is this gearbox suitable for my robot or project?: This gearbox is an eduational kit that you have to put together yourself. It is designed for use in small, indoor projects. The gearbox comes with plastic gears and small, low-voltage motors; if you are looking to build anything meant to work outdoors or in a rugged setting, you should be ready to replace the gearbox often or consider using a more robust, pre-assembled gearbox.
How will operating voltage affect motor lifetime? How bad is it to run these Tamiya motors at voltages exceeding the suggested 3 V maximum?: In general, the higher your voltage, the sooner your motors will die. Because these are toy motors, the manufacturer does not provide any official cycle-life specifications, but a customer of ours has conducted his own series of experiments that shed light on the relationship between operating voltage and motor lifetime. You can view Adam’s results here.