Over on twitter, WaterColorBot co-conspirator Sylvia says,
Oh mah glob guys…I got some new winches for the watercolorbot!! Made of metal peeps!! :D #coraline #watercolorbot
An EggBot is a compact, easy to use art robot that can draw on small spherical and egg-shaped objects. The EggBot was originally invented by motion control artist Bruce Shapiro in 1990. Since then, EggBots have been used as educational and artistic pieces in museums and workshops. We have been working with Bruce since 2010 to design and manufacture EggBot kits, and our well-known Deluxe EggBot kit is a popular favorite at makerspaces and hackerspaces around the world.
The EggBot Pro is as sturdy as can be: Its major components are all solid aluminum, CNC machined in the USA, and powder coated or anodized. (And isn’t it a beauty?)
The most common mechanical adjustments are faster with twin bicycle-style quick releases, and repositioned thumbscrews for easier access.
The frame also has an open front design that gives much better visibility while running, and greatly improved manual access when setting up.
And, it comes built, tested, and ready to use — no assembly required. Assuming that you’ve installed the software first, you can be up and printing within minutes of opening the box.
We’ve just given the WaterColorBot a little bump up to kit version 1.5. The new version now comes with a pair of beautifully machined aluminum winches.
The winches are precision cut on CNC machines and anodized clear. We add a few extra little parts (flat-head rivets to wind the winch around, screws, and a stamped and polished stainless steel “clamp” to hold the string end), and wind them with the same “100 pound” Spectra cord as we did before.
We described the process of making and winding our older laser-cut wooden winches in our blog post about the making of the WaterColorBot, and again in our post about the winch cutting jig. For better or worse, transitioning to the new aluminum means that we’re no longer using our older wooden winches that we described in those blog posts. But in the end, these new winches are a better, more elegant solution.
WaterColorBot kit version 1.5 is now shipping from the Evil Mad Scientist Shop.
For the robotics team that we mentor (FRC team 3501), we created an “Advanced Bristlebot Competition” to serve as an off-season team building exercise. We are publishing our competition template (PDF download) here so that anyone can use it as a starting point for their own events. The goals of the competition are to provide a self-contained, resource-constrained and time-limited introduction to a robot competition environment, and to get new and continuing students working together on solving simple engineering challenges.
The competition consists of three challenges: sprint (distance time trial), mountain climbing (same, on an inclined plane), and sumo (a two-robot competition that rewards going in circles).
The group of students is split into teams of two, trying to pair new students with team veterans.
Each team is given a set of rules and a small pile of toothbrushes, motors, and batteries.
Beyond this, one table is designated for tools and supplies, and has an assortment of craft supplies including things like coffee stir sticks, wires, twist-ties, googly eyes, pipe cleaners, pom-poms, and tape. Building tools include hot glue guns, scissors, bolt cutters (for cutting the heads off of toothbrushes), and wire strippers.
After a building period, the robots are “bagged and tagged” prior to competition. For the BristleBots, this means they are placed on paper plates marked with their team number for inspection to ensure that they meet the competition requirements.
The competition takes place in two rounds, separated by an interval of building time between them. The extra time allows the students to redesign and implement changes based on what they learned during the first round of matches.
We witnessed a couple of great moments during our event. We overheard some students watching our original BristleBot video on a phone, and when they noticed us watching them, they defended themselves, saying, “The rules don’t say we can’t!”
One of the most technically inclined students on the team, after building several prototypes and studying the performance of his BristleBots on the ramp for about 10 minutes asked, “This can’t actually be done, can it?” Minutes later, a veteran student from another team, proudly set his robot on the ramp and it whizzed up in one solid go in about 10 seconds. Later, during competition, another student watched her BristleBot zoom up the ramp in 3 seconds flat, using a variation on that successful design.
Materials & Resources