Subject:
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Re: Question Burst
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 25 Jan 2006 20:35:16 GMT
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Viewed:
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5989 times
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Hi Andrew,
Im sure other people will be able to fill in with more information, but
I might be able to point you in a few directions.
Andrew Meyer wrote:
>
> Question 1:
> Are the omniwheels at <http://www.charmedlabs.com/productsmain.htm> worth
> US$9.00? I am considering the purchase of 5-6, and $9 seems a bit much.
WOW, nice wheels. I do not own any, but they sure do look spiffy. if
your OK with non lego pure, these might be an easy way to accomplish
omni-direction.
> Question 2:
> To the GBC guys: How do you efficiently project a ball from a Lego robot
> several feet? I would like to build a semiscale model for my FRC team, game
> animation here: <http://robotics.nasa.gov/events/first/AimHigh-Sml.mov>
While I have not fired a soccer ball, I have built a Shock absorber
spring powered 2x2 block shooter.
There is an upcoming multi-robot autonomous block transfer game, that
looks like it has similar goals as the First link you posted.
Info on this game is here:
http://peach.mie.utoronto.ca/events/lego/lego-rtl20/
Many people are thinking that a omni-direction robot is the way to go.
I will be building a lego killough platform. Others will be
using syncro drives.
Leo has some fantastic info on lego killough platforms here.
http://staff.science.uva.nl/~leo/lego/killough.html
As well, if you google lego killough platforms, there are a wealth of
examples that might offer you other ideas.
"http://www.google.com/search?hl=en&q=lego+killough+platform&btnG=Google+Search
Back to shooting balls.
These are a few shots of the device I made that was inspired by
something Derek brought to a show/tell one day.
http://www.thepyroguys.com/r20/100_4383.JPG
the black thing at the left is what I need to shoot the blocks into.
http://www.thepyroguys.com/r20/100_4387.JPG
this is a close up, of a 4 "cog" mechanism, that slowly compresses 2
spring shock absorbers, then at the tip, will release the stored energy.
http://www.thepyroguys.com/r20/100_4388.JPG
this is a top view that shows the block (the white square)
http://www.thepyroguys.com/r20/100_4389.JPG
this is a top view that shows the block (the yellow 1x2 brick with hole
in it landed on its side) and the springs are in mid compression
http://www.thepyroguys.com/r20/100_4390.JPG
this is a over all back end view of the robot aiming at the "transfer
opening" (and my messy desk)
> Question 4:
> Does anyone know if there is a source for Lego-compatible mecanum wheels?
> These are similar to omniwheels, but the rollers are at an angle to the wheel,
> allowing holonomic movement (and regular turning!) with just four wheels.
> Wikipedia link here: <http://en.wikipedia.org/wiki/Mecanum_wheel>
>
>
> Andrew Meyer
while not a "true" Mecanum, Philo has a fantastic example of an all lego
design that might be what your looking for:
http://philohome.com/rama/rama.htm
Good luck with your robot. Keep us posted. I might look into buying
some of those wheels for myself.
Chris
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Message is in Reply To:
 | | Question Burst
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| As usual, I've stored up a bunch of questions, and I'm sending them out into the great beyond in the hopes that, amidst NXT battles, they will find their answers and return to me ;-) Question 1: Are the omniwheels at (URL) worth US$9.00? I am (...) (21 years ago, 25-Jan-06, to lugnet.robotics)
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