LEGO launcher in OpenSCAD
by tprestero, published
This is a simple lever and fulcrum that, combined with LEGO minifigures and children, turns into a catapult. Inspired by the "Made by Joel" website. http://madebyjoel.com/2012/05/small-catapult-toy.html
Also, an opportunity to experiment with laser-cut parts in OpenSCAD, and to test laser-cutter offsets for press-fit peg-joints.
First laser-cut wasn't a success. Perfect tolerance in OpenSCAD creates a too-loose fit with the laser-cutter. Needed to add some xy-plane thickness to the pegs to account for material removed by the laser.
Used minkowski() on the pegs to make them thicker:
-- 0.125mm recommended offset was too loose, needed glue.
-- 0.375mm appears to be a perfect press-fit offset (no hammering, no glue)
-- 0.5mm too-tight press-fit offset (had to hammer together, stripping a layer of laminate)
Idea and initial offset dimensions from http://www.thingiverse.com/thing:27736
Research suggests the laser cuts a v-shaped notch, widest closest to the cutting surface. Width and depth of the notch are presumably functions of the power and speed settings.
A 0.375mm offset worked best with 4.75mm (3/16") baltic birch plywood. Epilog 36-EXT, laser setting was SPEED=08, POWER=85 and FREQ=450.
OpenSCAD code has lots of comments and test-modules.
Liked ByView All
Give a Shout Out
LEGO launcher in OpenSCAD by tprestero is licensed under the Creative Commons - Attribution - Share Alike license.
What does this mean?
- You must attribute (give credit) to the creator of this Thing.
- You must distribute Remixes under the same license as the original.
- Remixing or Changing this Thing is allowed.
- Commercial use is allowed.
We're sure tprestero would love to see what you've printed. Please document your print and share a Make with the community.
To post a Make simply visit this Thing again and click I Made One to start uploading your photo. It’s even easier to post a Make via the Thingiverse Mobile app (available via Google Play and Apple App Store).