Let's Make Robots!

Rover 5 tracked robot chassis with adjustable clearance


AttachmentSize
Chassis_size.jpg195.69 KB
Rover5_Arduino.zip4.11 KB
Vendor's Description: 


Rover 5 is a unique and powerful  tracked chassis designed by OddBot and produced by DAGU.

Specifications:

Motor rated voltage: 7.2V
Motor stall current: 2.5A
Output shaft stall torque: 10Kg/cm
Gearbox ratio: 86.8:1
Speed: 1Km/hr
Encoder type: Quadrature
Encoder resolution: 1000 state changes per 3 wheel rotations

Tips on using the encoders with sample code can be found here: http://letsmakerobots.com/node/24031

Video indoors autonomous: http://v.youku.com/v_show/id_XMjE5NzkwODA0.html
Video outdoors RC mode: http://v.youku.com/v_show/id_XMjIwMTkxODk2.html
Video mecanum wheels:  http://v.youku.com/v_show/id_XMjI2MDAwMDEy.html

Unlike conventional tracked chassis's you can adjust the clearance. Strechy rubber treads maintain tension as the clearance is changed.

The standard chassis comes with two motors and gearboxes. Each gearbox has an optical quadrature encoder with a resolution of 1000 state changes per 3 revolutions of the output shaft (333.33 pulses per revolution).

The chassis can be upgraded to 4 motors and gearboxes with encoders making it ideal for mecanum wheels such as those produced by FINGERTECH.

The chassis is compatible with Pololu's expansion plates for the RP5 chassis. These plates are ideal for mounting hardware on the chassis.

The gearbox angle can be changed in 5 degree increments and adaptors are available allowing standard RC car wheels to be fitted.

Currently we have a PCB designed to allow Arduino development boards (not included) Diecimila, Duemilanove, Nano and Mega to mount easily on the chassis. This PCB includes power supply, motor drivers with current sensing, IR sensors on each corner, 2 small breadboards, a pan/tilt kit with our IR compound eye and a large prototype area under the breadboards where custom circuitry can be fitted.

The photo below and video show the robot using an Arduino Mega which is not part of the kit.

See the attachments for basic dimensions and autonomous sample code.

 

 

 

 

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Hi OddBot,

I just bought one 4WD from Sparkfun and it is a great chassis, congratulations man :-)

There is, however, an issue with one of the motor/gearboxes: it makes some wierd clicks while it spins and I am afraid it won't last long...

I'm not sure if it is some kind of factory assembly error or broken gear/motor... please, how can I troubleshoot it?

Also, where can I buy extra replacement parts for this platform?

Thanks in advance,

 

I faced smth like that also. They make the gears with kind of cheap plastic. From my point of view you shouldn't expect too much. Especially when the motors have a very high stall torque  

The problem isn't the gears. In some cases the encoder PCB has not been mounted correctly and it touches one of the gears. We are now re-designing the encoder to solve this problem.

Contact Sparkfun about the problem. I do not want to void your warrantee by telling you to disasemble it. Most likely it will be a simple fix. It is up to the distributors to decide if they want to stock spare parts.

I have read the specification : Output shaft stall torque: 10Kg/cm. But i don;t really get it.

Could the default Rover 5 chassis wheel and motors carry a Netbook on that, i mean the whole load of 1.5-2kg ?

Yes the chassis could handle a load of 2Kg. The bigger problem will be that the heavier the load the greater the posibility of throwing a tread. For heavy loads you would be better getting the 4 motor version and fitting it with Omni wheels or mecanum wheels.

Where is the best place I can get my hands on one of these in the UK?

Robosavvy is our distributor in the UK but currently they do not have the rover in stock.

OddBot,

I realise this is an old post but thank-you for sharing the UK distributer's web address. I've sent them an email about some replacement parts (broken wheel hubs) for a Rover 5 I bought second hand.

Mark

If you cannot get the parts from them then you can buy them directly from Claudia. There is a new wheel for the Rover 5 (now standard on new chassis's) that keeps the treads on better.