Science Fair 2015 - Router Forums
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post #1 of 20 (permalink) Old 12-27-2014, 12:26 PM Thread Starter
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Default Science Fair 2015

The last month or so has been a busy time with my youngest in the workshop. She had decided to do a science fair project comparing different bearing types (mainly because she wants to build a go-cart in the spring)

Her project design was pretty simple, build a bunch of identical cars with different bearing materials, and run them down a course with different weights and see which performed the best.

The cars were built with no bearings, nylon bearings, bronze bearings, and ball bearings. They ran without weights, and with 3 lbs and 5 lbs on them. It was a fun little project, and I am proud of the time and effort she put into the research and the building.

Hopefully she will get a ribbon by the end of January 2015!



The cars are identical, built of 1/2 ply, with 3 inch polyurethane wheels ($.50 each from surplus center). They have a 1/4" steel rod for the axle, that took a LOT of polishing to get smooth enough to use, and a dowel for the weights.

The track was 1/2" MDF, that was raised high at one end, and just a little at the other end to keep the cars at a reasonable speed when they hit the stop. The track was 24 feet long, and took up the entire hallway.

The cars were timed by a simple computer stopwatch program. On one end of the ramp, the cars pushed the 'F2' button on a keyboard, and on the stop line it pushed the 'F3' button on another keyboard. It worked surprisingly well. The secret was to make sure there was a fixed stop so the cars didn't destroy the keyboard on the finish line!

A link to one of the trial runs is below.

https://www.youtube.com/watch?v=jtge...ature=youtu.be

https://www.youtube.com/watch?v=eJeX...NhDl378WuwA7rQ

The woodworking was pretty simple, using jigs to make sure all parts were cut the same, drilled the same and assembled the same. A router and some rubber bands were the key to the timer start mechanism, and a hinge and a dowel were the key to the finish line. My daughter did the lion share of the work, except for the router and the tablesaw which scare her to death. <<< she loves the air nailer, drill press and chop saw, though! >>>

Sorry about the mess in the shop pictures!
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TWheels, TwoSkies57 and RMIGHTY1 like this.

Doug
1 John 1:9
Fredericksburg, VA




http://disasterreliefeffort.org/

Last edited by kp91; 12-27-2014 at 12:32 PM.
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post #2 of 20 (permalink) Old 12-27-2014, 12:38 PM
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Wow, that's impressive, Doug! Future Mechanical Engineer?
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post #3 of 20 (permalink) Old 12-27-2014, 01:00 PM
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KUDOS to your daughter....

This would have been the week that I'd have finished chewing thru the restraints...
If only new layers hadn't been added....

Stick....
Forget the primal scream, just ROAR!!!
"SNORK Mountain Congressional Library and Taxidermy”
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post #4 of 20 (permalink) Old 12-27-2014, 01:14 PM
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Inquiring minds need to know; what were the results? Significant differences?
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post #5 of 20 (permalink) Old 12-27-2014, 01:21 PM
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TY for allowing us to savor those moments with you.

Learning is an exciting adventure
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post #6 of 20 (permalink) Old 12-27-2014, 01:23 PM
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That's pretty cool.

That's my story and I'm stickin' to it!
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post #7 of 20 (permalink) Old 12-27-2014, 02:22 PM
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Neat father daughter project . I have a lot of memories building go carts when I was young as it just seems to be one of those phases you go threw as a kid .
Good times

I'll let her in on a secret . The larger the diameter of the wheels the better her go cart is going to go

I don’t always insulate , but when I do .
Ok ,I never insulate

Last edited by RainMan 2.0; 12-27-2014 at 02:26 PM.
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post #8 of 20 (permalink) Old 12-27-2014, 02:25 PM
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Quote:
Originally Posted by RainMan1 View Post
Neat father daughter project . I have a lot of memories building go carts when I was young as it just seems to be one of those phases you go threw as a kid .
Good times
Doug isn't fooling anybody...
his daughter will build it and he'll test drive...
and test drive and test drive and test drive....

This would have been the week that I'd have finished chewing thru the restraints...
If only new layers hadn't been added....

Stick....
Forget the primal scream, just ROAR!!!
"SNORK Mountain Congressional Library and Taxidermy”
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post #9 of 20 (permalink) Old 12-27-2014, 02:42 PM Thread Starter
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Quote:
Originally Posted by DaninVan View Post
Inquiring minds need to know; what were the results? Significant differences?
Her motivation for this project is "to go fast.... "

The bronze and ball bearings were pretty close until weight was applied, then the ball brgs were a clear winner. The wood only car didn't finish once the final weight was tried. The nylon bushings weren't anything to write home about.

Right now she doesn't see engineering in her future, but she has 5 more years of school to see what she might want to be.

She picked up some 10 inch wheels from HF, she wants to try those first. She will probably spend a lot of time modifying it once built.

Thanks for the kind comments, I am a little proud of her work right now!

Doug
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http://disasterreliefeffort.org/
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post #10 of 20 (permalink) Old 12-27-2014, 06:33 PM
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A chip off the old block.....

I ant to see photos of the computer set ups......VBG.

James
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