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In lugnet.technic, Miguel Agullo wrote:
> Hi all,
>
> After a quite a bit of time, I have a new MOC ready.
>
>
> Differtimento is my entry for the Planetery Society's Build a Better Rover
> Contest
>
> http://redrovergoestomars.org/mars-station_rovers.html
>
> and mentioned here too
>
> http://news.lugnet.com/technic/?n=9672
>
>
> Differtimento is a skid-steer vehicle that incorporates a differential connected
> to both both motors. When the motors turn in different directions, the wheelbase
> of the vehicle changes its shape mechanically, which increase its turning
> "efficiency" quite a bit. The vehicle also incorporates a very simple mechanical
> device that ensures that both tracks move at exactly the same speed if they move
> in the same direction - which is applicable to all skid-steering vehicles.
>
> A more detailed explanation can be found at my site, along with an Ldraw file,
> lots of renderings and step-by-step instructions to make one.
>
> http://www.geocities.com/technicpuppy/
>
> Photos
>
> (After moderation)
>
> http://www.brickshelf.com/cgi-bin/gallery.cgi?f=45847
>
> Some highlights (Rubber bands should cross!)
>
> http://www.brickshelf.com/cgi-bin/gallery.cgi?i=422277
>
> http://www.brickshelf.com/cgi-bin/gallery.cgi?i=422280
>
> http://www.brickshelf.com/cgi-bin/gallery.cgi?i=422228
>
> http://www.brickshelf.com/cgi-bin/gallery.cgi?i=422233
>
> http://www.brickshelf.com/cgi-bin/gallery.cgi?i=422239
>
> http://www.brickshelf.com/cgi-bin/gallery.cgi?i=422237
>
> http://www.brickshelf.com/cgi-bin/gallery.cgi?i=422235
>
> http://www.brickshelf.com/cgi-bin/gallery.cgi?i=422236
>
> http://www.brickshelf.com/cgi-bin/gallery.cgi?i=422278
>
> http://www.brickshelf.com/cgi-bin/gallery.cgi?i=422282
>
> Video (AVI Divx 4.1) can be found at
>
> http://members.chello.nl/agarc/dftmovie.avi (~700k)
>
> http://members.chello.nl/agarc/dftwhls.avi (~250k)
>
> Well, there it is - I hope you enjoy it. Incidentally, I came up with all this
> independently, but I would be surprised if it hasn't been done before. I will
> most definitely continue working on it. Next step is to incorporate a Scout (2
> motor ouputs) and make it a fully automatic platform that could provide mobility
> to other RCX or Scout based mechanisms, as some functions - like re-aligning the
> wheels after a turn - can be enhanced by computer control.
>
> Cheers
Fantastic Miguel!
I have been working a similar Rover concept for the last few months, although I
must confess, that I have focused on the brute strength approach - with motors
located at each wheel. My Rover is RCX controlled and has four wheel steering
just like yours – although at last count it had 6 motors and a rotation sensor.
I must say that your approach to driving each wheel assembly is quite innovate.
It reminds me of those little wind-up toys that move around the floor , and when
faced with an obstruction, automatically change direction – Quite a fascinating
approach.
I wonder if a similar behavior could be modeled in the RCX using the Voltage
monitoring functionality of NQC (when a driving motor is stalled it will attempt
to draw more power from the RCX batteries resulting in a change in voltage) to
trigger such a change in steering configuration. I will have to investigate!
My site should be ready in a week or so, so you can check out my version of a
Mars Rover – It too is modeled in LDraw as well as an ABS version – It would be
interesting to compare sizes, wheel base etc…
I look forward to further discussion.
Cheers
Tom Beattie
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Message has 1 Reply:
 | | Re: MOC Differtimento
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| (...) Hi Tom - thank you very much! (...) It took me about 3 months to complete this one. I ended up pulling an all-nighter to finish the Ldraw file in time for the contest! (...) I orginally wanted to enter at least 2 rovers in the contest. I (...) (21 years ago, 10-Jun-03, to lugnet.technic, lugnet.robotics, lugnet.cad)
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Message is in Reply To:
| | MOC Differtimento
|
| Hi all, After a quite a bit of time, I have a new MOC ready. Differtimento is my entry for the Planetery Society's Build a Better Rover Contest (URL) mentioned here too (URL) is a skid-steer vehicle that incorporates a differential connected to both (...) (21 years ago, 9-Jun-03, to lugnet.technic, lugnet.technic, lugnet.cad)
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