Catapult
102
Likes
1412
Downloads
6397
Views
Published on September 26, 2011
Description
The first version is a floating widget catapult (those patented plastic balls that you find in some black cans of beer).
Watch it in action :
vimeo.com/29575935
The second is an OpenSCAD catapult with one single parameter.
Just enter the diameter of your projectile and let it build arm and base accordingly.
Short animation showing variation of projectile_diameter from 10 to 35 millimeters :
vimeo.com/29589013
MakerBot friendly by nature, if you want a longer arm catapult also adjust the catapult_length parameter.
Reference :
en.wikipedia.org/wiki/Floating_Widget
Watch it in action :
vimeo.com/29575935
The second is an OpenSCAD catapult with one single parameter.
Just enter the diameter of your projectile and let it build arm and base accordingly.
Short animation showing variation of projectile_diameter from 10 to 35 millimeters :
vimeo.com/29589013
MakerBot friendly by nature, if you want a longer arm catapult also adjust the catapult_length parameter.
Reference :
en.wikipedia.org/wiki/Floating_Widget
Instructions
If you're a beer drinker, impress your kids by not injuring yourself extracting the floating widget.
If not, impress them anyway by measuring the shadow of your projectile at a known distance from a light source and by doing the math to determine its diameter.
Throwing power determined by infill solidity at printing time.
0.3 in the demonstration above.
Thanks to Igor
If not, impress them anyway by measuring the shadow of your projectile at a known distance from a light source and by doing the math to determine its diameter.
Throwing power determined by infill solidity at printing time.
0.3 in the demonstration above.
Thanks to Igor
You must be logged in to post a comment.
fma
on
January 9, 2012
said:
We had great fun with kids, at Christmas, playing with this nice catapults (using gift paper). Thanks for sharing!
Mjolnir
on
September 27, 2011
said:
2 kids, 2 cans of Guinness in the fridge. Coincidence? (Printing second catapult now...while drinking my second Guinness of the night). Very nice design, I love the "using objects found in your native environment" aspect of it. Your 30% infill suggestion was also most helpful.
pchretien
on
September 26, 2011
said:
Got two kids ... Love Guinness ... printing! :)
Thanks for sharing!
License
More from Benjamin
More from Mechanical Toys
BTW, it would be nice to have different angles for the arm. Depending how heavy is the thing you use, and how far you want it to go, 30
° or 60°, in addition to 45° would be great.
In fact, one base with all 30-45-60° angles would be better, to be able to switch during the batlle ;)
Done. Not the 30-45-60 base, but you now have an "arm_angle" in catapult_v2.scad