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Old 06-12-2011, 05:20 PM   #1
RivennHewn
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Default Trebuchet: 14 year old's 1 welding project

My son's science project.

He scaled from a picture, did the layout, cutting, grinding, and welding.

It also took a lot of fine tuning.

I watched, so he didn't lose a finger or eye.

Throws a tennis ball just over 50'.
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File Type: jpg treb5.jpg (77.7 KB, 227 views)
File Type: jpg treb4.jpg (69.0 KB, 224 views)
File Type: jpg treb2.jpg (90.4 KB, 309 views)
File Type: jpg treb1.jpg (83.2 KB, 283 views)
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Old 06-12-2011, 05:59 PM   #2
moogoob
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Default Re: Trebuchet: 14 year old's 1 welding project

Sweet! I think i was still playing legos at 14....
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Old 06-12-2011, 06:16 PM   #3
Catalyze
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Default Re: Trebuchet: 14 year old's 1 welding project

Most cool! Tell him he gets two pieces of pie for the great effort.
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Old 06-12-2011, 11:25 PM   #4
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Default Re: Trebuchet: 14 year old's 1 welding project

while your at it, teach him about safety.. I'd rather be uncomfortable then take a trip to the hospital and wait in the lineups...

radiated light from welding can/will leave a nasty sunburn..
sparks from a chopoff saw can hurt aswell.. maybe even use a face shield overtop the glasses...

Looks like fun tho
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Old 06-13-2011, 11:30 AM   #5
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Default Re: Trebuchet: 14 year old's 1 welding project

NICE!

I keep telling my wife (around the time of year when Punkin' Chunkin' is on tv, go figure) that I want to build a trebuchet. In the back of my mind I've always been afraid of how far it will launch the projectile though.
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Old 06-13-2011, 03:13 PM   #6
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Default Re: Trebuchet: 14 year old's 1 welding project

Only 50'?? Needs more weight both in the launcher and ball. Maybe a longer arm, too.

BSA leadership camp, we made catapults that launched water balloons ~100'. 7' launching arm. I don't recall what we used for the spring mechanism (bungies I think).
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Old 06-13-2011, 03:25 PM   #7
RivennHewn
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Default Re: Trebuchet: 14 year old's 1 welding project

The 'Science' was collecting data on weight/distance variables.

For a weekend project and 1st time welding, I was dang proud of him.

Also, it had to fit in the wife's car.
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Old 06-13-2011, 03:26 PM   #8
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Default Re: Trebuchet: 14 year old's 1 welding project

I built a couple of F.A.T's (Floating Arm Trebuchet) with my son & his friends when they were in Cub Scouts. There's a program floating around on the 'net that can help you design 'em. Cool project for your kid to learn welding on.

My last one. Gave it away, now I live on 5 acres & wish I had it back:

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Old 06-13-2011, 09:35 PM   #9
bartels_metal_works
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Default Re: Trebuchet: 14 year old's 1 welding project

Quote:
Originally Posted by moogoob View Post
Sweet! I think i was still playing legos at 14....
...I'm 29 and still playing with Legos!
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