Subject:
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Re: articulation points?
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Newsgroups:
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lugnet.build.mecha
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Date:
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Tue, 19 Nov 2002 21:22:09 GMT
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Viewed:
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974 times
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Hello, I would define a POA as a point when mobility occurs whereas the
rotattion is counted once. That is to say if a Shoulder joint spins forwards
and back it counts as one POA and should not be counted as two.
Example:
In this picture of the Little Bot Foot:
http://www.brickshelf.com/cgi-bin/gallery.cgi?i=174703
The Ankle tilts forward and back
The Ankle tilts side to side
The entire foot spins at the upper ankle
So that would be 3 points of articulation.
Together the points combined create 6 degrees of freedom.
As a rule of thumb I would say the POA should be counted then followed up by
the total degrees of freedom.
Example statement:
My Mecha is kick arse! It has lot's of movement. It rocks! It has 12 POA
giving the Mecha 24 DOF! Whoooo hooooo!
This way we all know what we are talking about.
Hope that helps. When we see your Mech we can see how many POA it has so we
know the DOF.
Good Luck!
Legomaster
In lugnet.build.mecha, Jason Coronado writes:
> just wanted to ask some fellow mech-ers exactly what constitutes a point of
> articulation. i am just finishing my second mech and i used at lease seven
> ball joints for the shoulders, hips, waist, and feet. i also used plate
> hinges in elbows and knees. how many p.o.a. is that?
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Message has 2 Replies:
 | | Re: articulation points?
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| thanks for taking the time to answer my question. if i calculated correctly (assuming that i count each joint only once per semetrical side , i.e., one shoulder joint, one hip joint, etc.) my model has about 20 poa and 40 dof. this is how i figure (...) (22 years ago, 20-Nov-02, to lugnet.build.mecha)
| | | Re: articulation points?
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| (...) Pedant's corner: This reminds me of an argument I've had several times, and to be honest have yet to come to a definitive answer. The maximum number of degrees of freedom an object can have in three dimensional space is six; translation in the (...) (22 years ago, 20-Nov-02, to lugnet.build.mecha, lugnet.technic, lugnet.robotics)
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Message is in Reply To:
| | articulation points?
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| just wanted to ask some fellow mech-ers exactly what constitutes a point of articulation. i am just finishing my second mech and i used at lease seven ball joints for the shoulders, hips, waist, and feet. i also used plate hinges in elbows and (...) (22 years ago, 17-Nov-02, to lugnet.build.mecha)
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