Subject:
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Re: Jumping 'bots?
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 19 Nov 1999 01:02:17 GMT
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Original-From:
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peter renshaw <goon@battinc.com.au&nomorespam&>
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Viewed:
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686 times
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At 17:37 11/18/99 -0500, you wrote:
> Would the 'bot be "required" to tote the RCX? With a few of the 36" cables,
> one could cut the weight down dramatically.
> > Funny enough I've been thinking about this. There's a particular type of
> > spider that also acheives this motion by pumping compressed fluid to it's • legs,
> > simultaneously and quickly. Power to weight ratio is going to be your
enemy here.
I guess one could tackle this a few ways. The first is,
design
-------
here's the bits of the 'Jumper' bot as such......
projectile = object to be thrown up, could be jumper or something else.
rcx = brains, co-ordinator.
power_plant = way to generate power to project projectile.
jumping_mechanism = organisation of lego bits to project projectile.
jumper = organisation of lego bits to throw projectile.
*is the bot stationary - this could allow you to design around the fact you
could minimise on the paylod weight, factoring out the rcx and battery weight.
jumper = (power plant + jumping mechanism) + rcx
jumper = projectile + (power plant + jumping mechanism + rcx)
*Is the bot movable (seems this is what the frog idea alludes to.) - weight
adds up quickly if you include
gears and axles and wheels. Of course you could have a moveable platform
which a projectile is thrown off the
platform.
//throws non connected projectile off moving platform, jumper weight is
projectile weight
jumper = projectile + (power plant + jumping mechanism + rcx + movable
platform)
//moving platform is projectile, jumper weight is total weight
jumper = (power_plant + jumping_mechanism + rcx + movable_platform)
*build a bot as light as possible stripping back on weight.
*rebuild/improve on design lightening the weight, improving the jumping
mechanism.
calculations
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*do some calculations to work out how much power is need to lift the weight
problem areas
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*power/weight ratio
-jumping mechanism is required to move weight, W and is limited by any
power output
from the motor. What do you use, gears? -weight, need to reduce it as much
as possible
but not cause failure of jumper on impact
*timing
-need to release the energy in a short period of time.
*power up times
-how regularlly is the projectile projected? Needs time to generate
required power. Is this instantaeous?
personal solution
------------------
I would like bot built using the solar panel/kinetic energy converter with
the power storage unit
coming out. Just leave it in the sun, chrages up to a certain level, then
releases the energy in a
short burst.
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Message is in Reply To:
 | | Re: Jumping 'bots?
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| Would the 'bot be "required" to tote the RCX? With a few of the 36" cables, one could cut the weight down dramatically. -----Original Message----- From: peter renshaw <goon@battinc.com.au> To: lego-robotics@crynwr.com <lego-robotics@crynwr.com> (...) (25 years ago, 18-Nov-99, to lugnet.robotics)
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