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<DIV>David,</DIV>
<DIV> Great inputs! Keep them coming. I am just starting
to consider what to do for the next RoboColumbus. </DIV>
<DIV>Regards,</DIV>
<DIV>Doug P.</DIV>
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<DIV style="font-color: black"><B>From:</B> <A title=davida@smu.edu>David
Anderson</A> </DIV>
<DIV><B>Sent:</B> Monday, December 5, 2016 2:09 PM</DIV>
<DIV><B>To:</B> <A title=dprglist@lists.dprg.org>dprglist@lists.dprg.org</A>
</DIV>
<DIV><B>Subject:</B> Re: [Dprglist] another interesting rover
approach</DIV></DIV></DIV>
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<DIV class=moz-cite-prefix>Hi Doug,<BR><BR>Nifty. <BR><BR>A couple
of things you might want to consider. <BR><BR>The Mars rover-style
rocker-boogie is, by design, very slow. In order for the forward
rocker to climb over an obstacle the rover must of necessity first essentially
come to a stop as it encounters the object, to force rotation around rocker
rather than around the wheel. This means that the design enforces a very,
very slow forward motion. It cannot maintain constant forward speed while
climbing over obstacles, or dealing with rough terrain, curbs, potholes,
etc.<BR><BR>If you are looking for a platform to compete with Scott's design or
jBot's, you will be hopelessly outgunned as far as time is concerned.
We'll wait all afternoon for you to complete the course. There are
other advantages to the rocker-boogie design, of course. But speed is not
one of them. Quite the contrary.<BR><BR>The second design you linked to
does not have this disadvantage, and can maintain forward speed on uneven
terrain. However it appears that the platform does not scrub the wheels
sideways very well, particularly on off-road surfaces. So while
straight line travel will be more efficient than the Mars-rover type platform,
steering in an off-road environment will be clumsy at best.
Odometry, if that's one of the things you are interested in, will probably be
impossible. You may remember that the real Mars rover can steer it's fore
and aft wheels towards each other, in order to pivot accurately. But that
it a much more complex design than those to which you've linked. And still
very slow.<BR><BR>Just some random thoughts. We studied these
designs pretty exhaustively when were were working on the 6-wheel outdoor
rover. That platform was not developed in a vacuum.
;>)<BR><BR>cheers<BR>dpa<BR><BR><BR><BR><BR><BR><BR>On 12/05/2016 12:41 PM,
paradug wrote:<BR></DIV>
<BLOCKQUOTE cite=mid:3307E7DF9A074EC5A98CF73B498FFCA7@dougi7 type="cite">
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<DIV>Here is another interesting 3D printed rover approach. Again, watch the
video.</DIV>
<DIV> </DIV>
<DIV><A title=http://www.thingiverse.com/thing:1583399
style='href: "http://www.thingiverse.com/thing:1583399"'
href="http://www.thingiverse.com/thing:1583399"
moz-do-not-send="true">http://www.thingiverse.com/thing:1583399</A></DIV>
<DIV> </DIV>
<DIV>Regards,</DIV>
<DIV>Doug P.</DIV></DIV></DIV><BR>
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