Subject:
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Re: articulation points?
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 21 Nov 2002 15:41:19 GMT
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Viewed:
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758 times
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In lugnet.robotics, "Rob Limbaugh" <RLimbaugh@greenfieldgroup.com> writes:
>
> The more DOF's, the better the overall control and positioning *could* =
> be. In the case of the video recorders, you can tell the differences =
> quite easily in 2, 4 and 6 head systems by pausing videos;
I was under the impression that a 6 head video recorder was a marketing
concept, i.e. it has 4 video heads and 2 audio heads, so in this case (all
things being equal) it would be exactly the same as the 4 head one. This is
really what I've been trying to get across, and that Steve put across more
clearly I think, simply that stating DOF based on the addition of all joints
can be misleading.
> Mechanically, the contrast could be made by putting your leg in a cast. =
> You can still function and move around within your fully extended ranges =
> of motion, but doing things requiring better control will be harder... =
> specifically, going up and down a staircase... knee and ankle =
> flexibility is greatly missed! In this example, your maximum extended =
> ROM hasn't changed, but your degree of resolution to move your foot =
> within that range has been greatly reduced.
By adding the cast you have removed a genuine DOF from the leg though, and
it is now only capable of sweeping out a surface at the end (assuming a
static foot) rather than a volume. Would adding a second knee (another hinge
joint) add as much utility as the first? I don't think it would under normal
circumstances, and this is why I don't think it really adds another DOF
since it is in many ways duplicating the effects of the first knee.
Jennifer
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Message is in Reply To:
 | | RE: articulation points?
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| (...) That, to me (and according to all definitions I've seen) is "range of motion". However, without DOF's, an effector couldn't be positioned. (...) The more DOF's, the better the overall control and positioning *could* be. In the case of the (...) (22 years ago, 20-Nov-02, to lugnet.robotics)
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