| Topic: |
Science > Physics |
| User: |
"Greg" |
| Date: |
04 Dec 2003 03:23:22 PM |
| Object: |
Project |
Hello I have a project I am working on that i am looking for some
ideas on how to do it.
The goal is to bring a 8oz stiroform cup full of marbles down a 1
meter ramp and any angle to bring it to a point on the ground 1 meter
away. We are allowed to put anything down and do whatever we want to
the ramp. The one thing we can't do is use motors and can't like hook
a string to the top of the ramp and lower the car with the marbles. We
are also allowed to put a barrier up to stop the car anywhere. The
judging is by how many marbles that fall out and how many cm the front
part of the car is away from the line. Also i almost forgot that we
can't put anything up on the top of the cup to hold the marbles in.
I was just wondering if anyone has done this yet and is there a good
way to do it. What do you think would work the best?
Thanks,
Greg
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| User: "Martin Stone" |
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| Title: Re: Project |
05 Dec 2003 05:40:53 AM |
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"Greg" <hello313@msn.com> wrote in message
news:93a6365e.0312041323.18e28c66@posting.google.com...
Hello I have a project I am working on that i am looking for some
ideas on how to do it.
The goal is to bring a 8oz stiroform cup full of marbles down a 1
meter ramp and any angle to bring it to a point on the ground 1 meter
away. We are allowed to put anything down and do whatever we want to
the ramp. The one thing we can't do is use motors and can't like hook
a string to the top of the ramp and lower the car with the marbles. We
are also allowed to put a barrier up to stop the car anywhere. The
judging is by how many marbles that fall out and how many cm the front
part of the car is away from the line. Also i almost forgot that we
can't put anything up on the top of the cup to hold the marbles in.
I was just wondering if anyone has done this yet and is there a good
way to do it. What do you think would work the best?
Thanks,
Greg
Fill cup with marbles. Place cart upside down on cup, and secure with
whatever mechanism is you wish to use to secure it. (suggest gaffer tape,
or duck/duct tape, or whatever you know it as) I'll leave stopping it
without rebound up to you and the other posters, but there is nothing on top
of the cup. It's within the rules, but they'll disqualify you anyway.
"We wanted you to meet an engineering challenge!"
"We did, it's just that the challenge was feeble." ;o)
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| User: "Greg" |
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| Title: Re: Project |
06 Dec 2003 07:41:25 PM |
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When i am making the gyroscope for the car what kind of bolts do i use
to connect the circles?
And the design I think i am going to go with is just a car with the
magnets and the magnets on the bumper. And in the car I am going to
set up a gyroscope. I am going to see how this works out. I can't do
the string b/c one of the rules is that I can't lower the car down.
Thanks for all your help you guys have been great!
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| User: "Greg Neill" |
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| Title: Re: Project |
08 Dec 2003 08:21:53 AM |
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"Greg" <hello313@msn.com> wrote in message
news:93a6365e.0312061741.29491c9d@posting.google.com...
When i am making the gyroscope for the car what kind of bolts do i use
to connect the circles?
And the design I think i am going to go with is just a car with the
magnets and the magnets on the bumper. And in the car I am going to
set up a gyroscope. I am going to see how this works out. I can't do
the string b/c one of the rules is that I can't lower the car down.
Thanks for all your help you guys have been great!
If the wheels have traction on the ramp, the string
mechanism can be entirely internal to the car. When
the string runs out, the wheels stop turning and the
car comes to a halt.
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| User: "Greg" |
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| Title: Re: Project |
08 Dec 2003 09:10:25 PM |
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Thanks for pointing that out Greg. Also would like to say nice name.
The problem i am having now is trying to figure out how to built the
gyroscope. I have the concept down of the rings and the size...i
think...I just can't seem to find out the type of bolts to use. And i
have to thank everyone that has helped me out already you have been a
big help.
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| User: "Uncle Al" |
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| Title: Re: Project |
04 Dec 2003 04:10:48 PM |
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Greg wrote:
Hello I have a project I am working on that i am looking for some
ideas on how to do it.
The goal is to bring a 8oz stiroform cup full of marbles down a 1
meter ramp and any angle to bring it to a point on the ground 1 meter
away. We are allowed to put anything down and do whatever we want to
the ramp. The one thing we can't do is use motors and can't like hook
a string to the top of the ramp and lower the car with the marbles. We
are also allowed to put a barrier up to stop the car anywhere. The
judging is by how many marbles that fall out and how many cm the front
part of the car is away from the line. Also i almost forgot that we
can't put anything up on the top of the cup to hold the marbles in.
I was just wondering if anyone has done this yet and is there a good
way to do it. What do you think would work the best?
Mount the cup in a gimbal.
Engineering: Attach a string to the axle of a little wooden car (plank
and two axles), fed from an on-board spool to which the other end of
the string is attached. As the car rolls the string unwinds/winds.
When you run out of string the car stops. Edmund Scientifics sells a
big bobbin of Kevlar string. Be clever with the wood (slot) to allow
room for the magic to progressively happen. Tension things as
appropriate for dynamic control.
Quick and dirty: Make the barrier massive (inertia) with a weak
magnet. The front of the car is ferromagnetic. Hit and grab.
Balance the gimbal wisely - were will you put the cup's center of
gravity vs. the cup support? Springs and dashpots, critical damping.
Do a number of dry runs to get the ramp angle sweet vs. roll and
stop. Note the surface upon which the contest will be run. Carpet is
not the same as terrazzo. Mind path curvature.
If you are very naughty, the last pull will pull a slip to close the
circuit of a little greeting card song chip. Aesthetics count.
--
Uncle Al
http://www.mazepath.com/uncleal/
(Toxic URL! Unsafe for children and most mammals)
"Quis custodiet ipsos custodes?" The Net!
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| User: "Paul R. Mays" |
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| Title: Re: Project |
04 Dec 2003 04:54:55 PM |
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"Uncle Al" <UncleAl0@hate.spam.net> wrote in message
news:3FCFB0E8.F2E4444F@hate.spam.net...
Greg wrote:
Hello I have a project I am working on that i am looking for some
ideas on how to do it.
The goal is to bring a 8oz stiroform cup full of marbles down a 1
meter ramp and any angle to bring it to a point on the ground 1 meter
away. We are allowed to put anything down and do whatever we want to
the ramp. The one thing we can't do is use motors and can't like hook
a string to the top of the ramp and lower the car with the marbles. We
are also allowed to put a barrier up to stop the car anywhere. The
judging is by how many marbles that fall out and how many cm the front
part of the car is away from the line. Also i almost forgot that we
can't put anything up on the top of the cup to hold the marbles in.
I was just wondering if anyone has done this yet and is there a good
way to do it. What do you think would work the best?
Mount the cup in a gimbal.
Engineering: Attach a string to the axle of a little wooden car (plank
and two axles), fed from an on-board spool to which the other end of
the string is attached. As the car rolls the string unwinds/winds.
When you run out of string the car stops. Edmund Scientifics sells a
big bobbin of Kevlar string. Be clever with the wood (slot) to allow
room for the magic to progressively happen. Tension things as
appropriate for dynamic control.
Quick and dirty: Make the barrier massive (inertia) with a weak
magnet. The front of the car is ferromagnetic. Hit and grab.
Balance the gimbal wisely - were will you put the cup's center of
gravity vs. the cup support? Springs and dashpots, critical damping.
Do a number of dry runs to get the ramp angle sweet vs. roll and
stop. Note the surface upon which the contest will be run. Carpet is
not the same as terrazzo. Mind path curvature.
If you are very naughty, the last pull will pull a slip to close the
circuit of a little greeting card song chip. Aesthetics count.
--
Uncle Al
http://www.mazepath.com/uncleal/
(Toxic URL! Unsafe for children and most mammals)
"Quis custodiet ipsos custodes?" The Net!
Unky Al's string controlled gimbaled cart idea is my favorite..
I would also suggest you mount felt pads clued to each wheel
that can be used to press against mounted plates on the chassis
and by adjusting the tightness of the wheels you could brake
the cart and adjust for different inclines to control decent speed
.... When the string runs out have it trip a spring loaded trigger
to snap out against a wheel to lock it up and pull the tab on a
greeting card greeting chip... Then get fancy if you want to
up the grade with a nice model car body cut to fit maybe with
a little ALf stuffed animal as a salute to Unky Al for the idea ;)
in the driver seat.... Also I suggest rubber tread to aid in cohesion
to the ramp surface at steep angle of incline....
Paul R. Mays
----------------------------------------------------------------------------
-
Some where within the Quantum State
Http://Paul.Mays.Com/story.html
http://paul.mays.com/mayday.html
"All truth passes through three stages:
First, it is ridiculed
Second, it is violently opposed
Third, it is accepted as self-evident."
- Arthur Schopenhauer
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