Subject:
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Re: Grelnix
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Newsgroups:
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lugnet.technic
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Date:
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Mon, 31 Dec 2007 01:10:53 GMT
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Viewed:
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18038 times
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In lugnet.technic, Kevin L. Clague wrote:
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In lugnet.announce, Eric Sophie wrote:
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New Mecha: Grelnix
Completed X-mas Day 2007.
6 weeks to construct.
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Hi Eric,
Do you have pictures of the inside of the joints? I’m curious about your
gearing techniques.
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Hi Kevin!
I used a combination of techniques. I don’t have many pictures of the joints per
se. They are mostly hidden and covered.
Although, these are much of the same techniques I have preached for years.
I’ll describe some here now:
Shoulders - Hips
The shoulder and hip splay use a z40 and technic triangle plate (actually, that
you gave me when you visited, lol) and a pair of beams from the Bionicle
Bohroks.
Neck
The neck uses a series of double ended ball joints to provide articulation:
Although not a true geared set up, it is still rather nifty, because I added a
half dome/golf ball under the head and the twisting motion of the ball joints,
rides along the shape of the half dome. Guiding the neck articulation.
Ankles - Knees
Since this is such a large and heavy creation, I used the technique I developed
whereas, the worm gear box (in this case a Robo Rider Gear Box), drives a z8 to
z40. The beam is bound to the z40 via half axle pins.
The weight is transferred off the axle and on to the gear itself. Then the
mechanical reduction of the z40 attempting to turn against the z8 provides
additional strength and resistance.
As described and published here in the book we were part of:
LEGO Mindstorm Masterpieces: Building and Programming Advanced Robots By Miguel
Agullo
Inner hips - inner shoulders - elbows and ankles
....all use ball joints in multiples.
In this tiny picture you may notice the turntable is mounted to a set of ball
joints. This allows for rwd/rev motion/tilt.
In these additionally bad and hastilly taken pre completion cell phone pictures,
you may notice some shocks, levers and ball joints that flow between the points
of articulation. These provide additional stability and rigidity between the
joints.
Along with the related technic construction, these ae the core components that
led to the robot’s creation.
....plus monkey arms and 2 two inch hoses....from the Star Destroyer of course.
Eric
p.s. I will be adding a few more pics once I can get some decent sun light here
in the photography area...
:)
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Message is in Reply To:
 | | Re: Grelnix
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| (...) Hi Eric, Do you have pictures of the inside of the joints? I'm curious about your gearing techniques. Kevin (16 years ago, 29-Dec-07, to lugnet.technic, FTX)
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