Bottom view of Dagu Wild Thumper 6WD chassis (silver version). |
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This rugged, 6-wheel-drive chassis from Dagu Electronics is designed to excel at traversing rough terrain and steep inclines, making it a great platform for any robot that needs to perform tasks in a complex outdoor environment. It features six powerful DC motors with brass brushes and 34:1 or 75:1 steel gearboxes that drive large (120mm diameter) spiked tires, and a unique “super-twist” suspension system acts to keep each wheel in contact with the ground for maximum traction, even when driving over uneven or bumpy surfaces. The suspension can be adjusted to suit different loads and conditions. The chassis is made from a 2mm-thick corrosion-resistant anodized aluminum plate, all of the nuts, bolts, and screws are stainless steel, and the brass fittings and suspension springs are nickel-plated.
When powered at 7.2 V, the version of the chassis with 34:1 gearboxes can reach a top speed of approximately 7 km/h (4.5 mph), and each motor has a stall torque of roughly 5 kg-cm (70 oz-in). At the same voltage, the version of the chassis with 75:1 gearboxes can reach a top speed of approximately 3 km/h (2 mph), and each motor has a stall torque of roughly 11 kg-cm (150 oz-in).
Using the Chassis
The chassis’ aluminum plate has 4mm holes spaced every 10mm, providing plenty of options when it comes to mounting your control electronics, sensors, and additional hardware, and with a maximum recommended payload of 5 kg (11 lb), this platform is capable of carrying a lot of cargo! Two compartments in the chassis have been designed to hold 7.2 V sub-C battery packs (not included) that are commonly used in RC cars. A total of four such battery packs can fit in these compartments. The interior of the chassis also features convenient screw terminals for connecting your battery and motor driver leads. The motor leads are pre-connected to these screw terminals.
Side view of Dagu Wild Thumper 6WD chassis (black version). |
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Dagu Wild Thumper wheel 120×60mm (chrome) with Pololu 25D mm metal gearmotor. |
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This is a differential-drive chassis, meaning that turning is accomplished by driving the motors on the two sides of the platform at different speeds. The three motors on each side of the robot are wired in parallel, so only two channels of motor control are required to get this chassis moving. The motors are intended for a maximum nominal operating voltage of 7.2 V (2 V minimum), and each has a stall current of 6.6 A and a no-load current of 420 mA at 7.2 V. Since the motors will briefly draw the full stall current when abruptly starting from rest (and nearly twice the stall current when abruptly going from full speed in one direction to full speed in the other), Pololu recommend a motor driver capable of supplying the 20 A combined per-channel stall current of these motors at 7.2 V. Pololu offer several motor controllers and drivers that meet these power requirements and make it easy to get this chassis moving:
Dagu Wild Thumper 6WD all-terrain chassis, silver. |
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Dagu Wild Thumper 6WD all-terrain chassis, black with metallic-red hubs. |
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Specifications
Chassis Options
This chassis is available in two different colors (silver and black) and with two different gear ratios (34:1 and 75:1):
Dagu Wild Thumper 4WD all-terrain chassis, black. |
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If you are looking for a smaller, less expensive chassis, consider one of the Wild Thumper 4WD models:
The higher gear ratio version has a lower top speed but can produce greater torque. Note that while the Wild Thumper chassis includes six wheels, the wheels can be purchased in pairs for use as replacement Wild Thumper parts or as wheels for custom chassis. The wheels are available with metallic-red hubs and chrome-colored hubs. Pololu also offer the Wild Thumper gearmotors individually in a wide range of gear ratios (versions with integrated quadrature encoders are also available, though these will not work with the Wild Thumper chassis).
Videos
34:1 gear ratio version with black chassis and metallic-red hubs driving around a construction site:
34:1 gear ratio version with black chassis and metallic-red hubs driving up and down a set of stairs:
75:1 gear ratio version with silver chassis and chrome-colored hubs driving on snow:
People often buy this product together with:
Pololu TReX Dual Motor Controller DMC01 |
General specifications
Gear ratio: | 34:1 |
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Color: | silver |
File downloads
Modifying the Wild Thumper to use motors with encoders (3MB pdf)
Customer Richard Nguyen has documented his work modifying the Wild Thumper chassis to use 25D motors with encoders in place of the chassis’s included motors.
Note: This is not an easy modification, and the chassis can be damaged if it is not done properly, so Pololu generally recommend against it, and Pololu can only provide very limited support for those who want to attempt it. The manufacturer did not intend for the chassis to be modified in this way, and Pololu do not know how well such a modification will work out.
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Unit 18, 132 Garden Grove Parade
Adamstown
NSW, 2289
Australia
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