Subject:
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Re: Question, opinion, help - Claw Hands
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Newsgroups:
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lugnet.build.mecha
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Date:
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Sat, 13 Jul 2002 03:47:38 GMT
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Viewed:
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354 times
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Hey John!
In lugnet.build.mecha, John Barnes writes:
> I am not that familiar with mecha, in the sense that I don't seem to have a
> natural feel for what is mecha and what is robotic.
I would say that they are the same except the word Mecha is used to describe
a more ornate futuristic cousin of current day Robotics.
> With that in mind, firstly, do mecha have to have human style anatomy at the
> gross level, ie; arms with hands with fingers, or do they have "effectors"?
Good observation, it could be any of the above.
> I'd always wondered if you couldn't come up with a "cylindrical" hand,
> perhaps attached using a technic turntable with a center pull/push mechanism
> which opens and closes the "rosette" of fingers.
oooooohhhh clever, "rosette" of fingers - Elegant! You got me thinking.
> or,
>
> If it must be humaniod, I have always eyed the Technic control cable as a
> possible "tendon" which might string along the underside of jointed fingers
> which could be pulled to curl the finger (against a straightening force
> supplied by a rubber band for example).
Ok, this is something I have explored. I made individual fingers using flex
cables. I arranged them into a 4 finger design. I found a couple of things
with the design.
1. The flex cables connected at the tip of the finger and strung along the
underside of each joint, offered great range of movement and good curling
characteristics.
2. The Flex Cables litterally pulled out from their end connectors upon a
certain load. Rendering the finger limp. I doubled up on the Flex Cables and
found no decernable load sharing.
3. The strength of the finger was at the Base where the cable was being
pulled rather than at the tips where the was little force being transmitted
thru the cable. With no fulcrum at the tip of the finger to provide a tilt
force action, the only real power was away from the buissness end.
4 At a certain Arc, the Flex Cables loose their ablitity to curl further.
5. The angles of the toggle joints carrying the Flex Cables interferred with
the range of movement because they limited the maximum Arc the Cable was
capable of.
But that's only one design within the theme of the application. If these
could be overcome or muted, then you'd be on to something.
Keen Idea
> Well that's it.
>
> For all I know, this is probably all robotics talk ;)
>
> So what is mecha?
>
> JB
Thanks John, BTW - Do you guys have any idea how cool my new Robot is going
to be when I add all the Cool Gadgets and Gizmos John Barnes Hand fits into
standard Lego Bricks, when I put them all in my new Mecha?!!!???!!!
Visit
www.hitechnicstuff.com
Tell em' "The Legomaster sent me!"
Eric Sophie
Legomaster
LMHoF
www.mylegomaster.com
> > Folks, I'm in a bit of a quandry. Traditionally I don't like "Claw Hands"
> > meaning the kind you see on a Submersable Sub or better know as Pinchers or
> > Grabers.
> >
> > My problem: I'm making a Mid-Sized Technic Fig Scale Robotic Mecha.
> > (4ft.tall biped)
> >
> > I have an issue with creating the right kind of hand for the Mech. I would
> > (of course)like to create the most humanoid hand possible. Trouble is the
> > size of a decent humanoid hand exceeds the scale I'm working on. (including
> > Mechancis and all)
> >
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Message is in Reply To:
 | | Re: Question, opinion, help - Claw Hands
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| I am not that familiar with mecha, in the sense that I don't seem to have a natural feel for what is mecha and what is robotic. With that in mind, firstly, do mecha have to have human style anatomy at the gross level, ie; arms with hands with (...) (22 years ago, 13-Jul-02, to lugnet.build.mecha)
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