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Unread 04-03-2008, 17:05
Jeff Rodriguez Jeff Rodriguez is offline
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Re: Non-metallic frame

Quote:
Originally Posted by AdamHeard View Post
Rage 173 has also been known for the all Birch (pretty sure it's Birch) Plywood base for years.
Find any picture of any of our past robots and you'll see what he's talking about. Our base is made of 9 ply Baltic Birch plywood.
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Unread 04-03-2008, 17:10
Laaba 80 Laaba 80 is offline
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Re: Non-metallic frame

Team 1714 builds almost our whole robot out of polycarbonate. We always have, however this year we stepped it up. The only metal we have in our chassis is the gear boxes, the rest is all polycarb.
Joey
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Unread 04-03-2008, 17:18
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Re: Non-metallic frame

Teenagers are so conservative... Thanks a lot

Our team, 2083 actually made our arm/lifer out of kevlar(bullet proof, RIGHT ON!!) and it is amazingly tuff. The thing is a total of 20 pounds with motors. Only problem is it takes around 2 weeks to assemble. So if you have plenty of time and money, kevlar makes a great arm. (Note: you must also carve out a foam core for it to be strong.)
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Unread 04-03-2008, 17:33
CraigHickman
 
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Re: Non-metallic frame

Quote:
Originally Posted by jimbot View Post
Teenagers are so conservative... Thanks a lot

Our team, 2083 actually made our arm/lifer out of kevlar(bullet proof, RIGHT ON!!) and it is amazingly tuff. The thing is a total of 20 pounds with motors. Only problem is it takes around 2 weeks to assemble. So if you have plenty of time and money, kevlar makes a great arm. (Note: you must also carve out a foam core for it to be strong.)
Uh. Kevlar Weave, when in the right thickness/amounts, can be bullet RESISTANT.

Very true on the foam core part. I've built carbon fiber, fiberglass, and kevlar/carbon weave longboards, and without a foam core, there is NO structure.
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Unread 04-03-2008, 17:33
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Re: Non-metallic frame

Quote:
Originally Posted by jimbot View Post
Teenagers are so conservative... Thanks a lot

Our team, 2083 actually made our arm/lifer out of kevlar(bullet proof, RIGHT ON!!) and it is amazingly tuff. The thing is a total of 20 pounds with motors. Only problem is it takes around 2 weeks to assemble. So if you have plenty of time and money, kevlar makes a great arm. (Note: you must also carve out a foam core for it to be strong.)
Pictures? I gotta see this.
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Unread 04-03-2008, 18:41
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Re: Non-metallic frame

One example from this year that's right close to home from yours truly: 1293.



Their robot this season, R5D5, has a chassis cut from one piece of UHMW, around 1.25" if I remember correctly. There's more to their robot than is pictured (bearing mounts, bumper mounts, etc.), but I'll leave that for them to post (or to show off at Palmetto).
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Unread 04-03-2008, 19:00
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Re: Non-metallic frame

In our first year (before the kitbot frame) we just bolted bearing blocks on to a flat sheet of 3/4" plywood. Technically, we had a wooden drive base, I guess. We were going to use 1/2" plywood for the sides and top, but that was a bit heavy, so we went with urethane foam cored fibreglass.

We used the fibreglass on our superstructure the following year and built a wooden arm that probably had a strength/weight ratio higher than any of the aluminum arms that year (we demonstrated it by having two judges stand on a replica of it) and our team's passion for wooden materials was ignited.

The following year we had pulleys turned on the wood lathe from mahogany, bearing blocks cut on the CNC router from maple, and the entire ball shooter mechanism made of baltic birch plywood.... bearings, shafts and such excepted, of course.

Last year our elevator was "all wood"... well, with the exception of some of the hardware, motors and pneumatics, that is.

This year our superstructure is once again wooden, but the plan was to custom build a 6wd chassis out of plywood. That plan got laid by the wayside when the game was announced as the kitbot seemed ideal.

People are always amazed at how much wood we have in our robot... they forget that wood is the original carbon fibre!

Jason
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Unread 04-03-2008, 19:22
Rick TYler Rick TYler is offline
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Re: Non-metallic frame

Quote:
Originally Posted by dtengineering View Post
We used the fibreglass on our superstructure the following year and built a wooden arm that probably had a strength/weight ratio higher than any of the aluminum arms that year
If you were in Portland that year (I'm guessing 2005, right?) you might remember Wooden Thunder, which sported an Okoume plywood tower that I built from boat scraps to show students that not everything had to be aluminum. The students bolted it onto the kitbot chassis and it is what went to the tournament. I remember a 'bot with a wooden arm (sounds like the beginning of a joke...) that could well have been yours.
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Unread 04-03-2008, 21:15
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Re: Non-metallic frame

1676 is mostly metal, but our gripper is made from a composite consisting of end-grain balsa wood covered with light fiberglass cloth and polyester resin. Very light, incredibly crush-resistant, stiffer than 1/2" CDX plywood too.

Don
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