Tag Archives: rotacaster

Holonomic Platform for 125mm Rotacaster Omniwheels

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I’ve been working on a very solid, Holonomic Platform to be used with the large 125mm Rotacaster Omniwheels as part of my display for the TAZ-Brick Collector Club’s Brixhibition to be held on the weekend of 20-21 April 2013.

LEGO Mindstorms NXT Rotacaster Bug Bot

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I originally built this LEGO Mindstorms NXT Bug Bot Robot as part of a display at the TAZ-Brick (www.tazbrick.com) Collector Clubs Brixhibition North. The robot proved a hit with the under 10, LEGO Fanatics. Since then I’ve been playing around with the design of my Mindstorms NXT Bug Bot. In this new version I have replaced the 2x RCX type Touch Sensors with 2x NXT type Touch Sensors. The front bumpers had to remodelled to take the NXT Touch Sensors.

Mars Rotacaster Rover – ‘Mark II’

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Lookout NASA, you have Rover competition. And it uses the amazing Rotacasters for unsurpassed maneuverability in confined spaces. The Mars Rotacaster Rover is based on the current NASA Mars Rovers with their unique suspension set-up.

The Mars Rotacaster Rover – Part II

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Lookout NASA, you have Rover competition. And it uses the amazing Rotacaster Omni-wheels for unsurpassed manoeuvrability in confined spaces. The Mars Rotacaster Rover is based on the current NASA Mars Rovers with their unique suspension set-up.

The Mars Rotacaster Rover

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Part I

Lookout NASA, you have Rover competition. And it uses the amazing Rotacaster Omni-wheels for unsurpassed maneuverability in confined spaces. There is no need of a steering mechanism to turn the Rotacaster Rover thanks to the unique wheel design.

More on the New & Improved Rotacaster Omni-wheels

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I received a a new batch of Rotacaster Omni-wheels several weeks ago which look and work fantastic. I gave them a good test run way back on 15th June 2011 and videoed my results. It’s a while, but here they are fitted to a Killough type platform powered by LEGO Mindstorms NXT kit fitted with 3x NXT Motors to drive the Rotacasters.

Line-Following Rotacaster Dump Truck

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As promised a week or so ago, “too put the New Rotacaster Omni-Wheels through their paces”. They where just what I need for the Line-following Dump Truck I’ve build developing as part of a larger on going project. The Rotacasters defiantly help the Truck negotiate the tight corners on my test Line-following mat.

New Improved Rotacaster Omni-wheels

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I received a a new batch of Rotacaster Omni-wheels today which look and work fantastic. The new Colour Palette, matches that of the LEGO Mindstorms NXT Kits. They will look the part on any LEGO Model.

Rotacaster Omni-wheel Grip Tests

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I received a parcel from Rotacaster Pty. Ltd. a fortnight ago which contained a new set of4x Rotacasters with the new Black Hub-centres and S55A Hardness type Orange Rollers and a set of 3x Rotacasters with the new Black Hub-centres and S45A Hardness type rollers. The S45A’s roller colour is a perfect match for Lego’s “Dark Bluish Gray” colour scheme.
I was excited about testing the new wheels using softer durometer materials on the rollers. The S45A do provide better traction, which should be especially good for lighter robots. The S45A compound is very similar to the white oblong type pencil rubbers.

Rotacaster – Lego Space Police Sentinel

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Bazmarc‘s (Marc-Andre Bazergui) Lego Space Police Sentinel, Based on the LEGO® Space Police theme, this Sentinel is NXTfied and makes use of Rotacaster‘s upcoming NXT/Technic compatible Omni Wheels!

Rotacaster as a Steering Jockey-Wheel

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Using a Rotacaster Omni-wheel as a Steering Jockey-Wheel in a Differential Drive Robotics platform is an easy way of producing a Robot with precision steering. When the bot travels in a straight-line, one of the Rotacaster Omni-wheels rollers becomes the Jockey-wheel. To turn the platform you simply rotate the powered Rotacaster Omni-wheel. By play with the gearing of the drive to the Rotacaster, you can obtain great accuracy in controlling your Robot. This configuration is ideal for  “Line-Following” Robots.

Shape-Changing Rotacaster Flexi-Bot

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The Shape-Changing Rotacaster Flexi-Bot acts like a Chameleon, but instead of changing colour, it can morphs into a variety of different  leg configurations. The front and rear pairs of arms are controlled as a pairs change the configuration of the Rotacaster Omni-wheels relative to the Robots body. Each Rotacaster Omni-wheel is driven individually via a Small Lego Power Functions Motor. The Arm pairs are driven individually by a pair of Lego Mindstorms NXT Servo Motors.

Autonomous Rotacaster Omni-Bot

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This Autonomous Quad Drive Omni-Bot fitted is with Rotacasters Omni-wheels and uses 4x Ultrasonic Sensors to aid in navigation. It’s based on my previous Quad-Drive Rotacaster Omni-Bot with the addition of the Ultrasonic Sensors. The main challenge is to use all 4 Ultrasonic Sensors without them interfering with each other, resulting in non-valid measurement readings for distance values to objects.

Quad-Drive Rotacaster Omni-Bot

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As I have a set of four Rotacaster Omni-wheels to test drive, I decided to build a 4-wheel Omni-Bot for a change from the normal 3-wheeled versions. Build a solid & compact 4 wheel platform wasn’t as easy as I first envisaged. But after 3 attempts I hit upon something that worked. The Lego purists may no approve of the way I had load a few joints to get it too work.

Rotacaster Omni-wheels in Action!

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An example of a Lego Mindstorms NXT Killough Platform featuring 3x Rotacaster (www.rotacaster.com.au), R-2048-01 Double 48mm Omni-Wheels. 3x NXT Motors and a Mindsensors PSP-Nx-v3, a Sony PlayStation2 Controller interface for NXT to control the Robot.



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