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In lugnet.robotics, James Garrett wrote:
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In lugnet.announce.moc, Eric Sophie wrote:
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New improved neck geometry. Neck and Head motion use RC Racer style motors.
Stage Seven Goals:
- Use polarity reversor and RC steering servo for neck control.
- Locate proper pivot geometry for the neck.
- Incorporate large shock absorber to aid with the weight of the neck.
- Route wires and camera cables though the body.
Stage Eight Goals:
- Complete sides of the neck.
- Complete head design.
- Add cockpit for pilot.
- Begin tail articulation.
Eric Sophie
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Very impressive. The complexity of this robot is astounding.
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Thank you, it is just taking a long time to build.
I don’t want to build it the wrong way.
So I choose carefully the steps involved.
Plus, it is tough going on my fingers.
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It looks very heavy.
Will there be enough power for the weight?
I am not doubting your work but it is a question that may come to some when
they see how many parts are involved in the robo quad.
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Hard to say. All the joints are very strong.
The motors provide plenty of power with the gearing.
Though, the forces at play can act like a big lever against the worm gears.
At certain weights, worm gears and Technic turntables can become like big
click hinges. Containing the pressure between the worm gear and the teeth
on the Technic turntables is the key. Hence the c-clamps around the joints.
Also, the other joints and points on the body where motion should be
transfered
when one joint moves, if, these are not moving at the same time,
the resistance
in the other limbs causes poor performance. All limbs must act
in concert. Each
limb can move a slight amount, individually to help shift
weight, then is when
corresponding limbs should move in concert.
So, one of the twelve joints can move freely under power, until the other
eleven worm geared joints start to oppose it. The twelve joints use 20 motors.
Two high RPM motors per joint, except the ankle steering, which use one each.
The wheels at the feet and neck use RC Motors, which have high torque
and high RPM’s. So there is no problem there. The spine must work along the
legs, although it has a good gear train, it is still only one motor.
The robot only uses what structure is required to house and interconnect the
mechanics. Sans some slopes at the ends and begining of some components.
Still, the robot is very heavy. We’ll see soon, I worked on the Robot all day
and I completed the back of the head, as well as the sides of the neck.
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Another important question: have you programmed in Asimov’s three laws?
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At this rate we’ll need them soon. Funny though, if a Robot is built clumbsy,
it can have trouble with one of the laws.
The thing almost fell
on me.
LMAO, it is not clumbsy, I just wasn’t being careful.
Eric Sophie
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Message is in Reply To:
 | | Re: Robo Quad - Stage Seven
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| (...) Very impressive. The complexity of this robot is astounding. It looks very heavy. Will there be enough power for the weight? I am not doubting your work but it is a question that may come to some when they see how many parts are involved in (...) (18 years ago, 10-May-07, to lugnet.robotics, lugnet.technic, FTX)
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