The game piece handling mechanisms within Triple Helix’s 2020 competition robot employ rollers of various shapes and sizes. This brief slide deck outlines the team’s 4 standard configurations for the ends of these rollers. We classify idle rollers, driven rollers, and two types of driving rollers.
Festo gives the flow rate through their solenoid valves in terms of “standard nominal flow rate”. What does this mean? How does it compare with other valves on the market?
Here’s a spreadsheet that converts the specified flow rate (which is actually a mass flow rate even though it’s in units of volume/time) into a flow coefficient or Cv. This lets you directly compare the size of the valve to other vendors’ stuff.
Did you know you can use HTD pulleys instead of gears in the VexProSingle Reduction Clamping Gearbox, or in the 3rd stage of a Ball Shifter?
Here’s a spreadsheet of belt/pulley and chain/sprocket combinations that may be swapped into some common COTS 20DP gear spacings: 84, 90, and 112 teeth.
Triple Helix Tech Tips are an idea we’ve been mulling for a while. This is where we share our tips and tricks, which we hope will be useful especially for rookie teams. We’ve been around a while, and have learned some lessons, sometimes the hard way. Hopefully these will save you a little pain, a little time, and a little cash.
When we recruit new students, one of our favorite lines is, “Nobody who joins the team knows how to build a robot. We’ll teach you.” As an established team, we go to competitions and see younger teams, some of whom don’t have engineering mentors, struggling to learn lessons we have learned the hard way. We see our role in growing FRC as helping those struggling teams become better more quickly, so they remain inspired, and don’t fold.
Last fall our students came up with the idea of producing a series of instructional videos. These would teach our incoming rookies the skills they would need to be productive robot builders. We see this video series, and the ones which will follow, as a tool which can help educate inexperienced students on our own team as well as other teams across FRC.
During the quarter-finals of our last competition, our Pilot looked out over the field and noted that 3 of the teams of the field were using our climbing ropes, one of which was on the opposing alliance. After seeing so many posts about ropes failing in competition, 2363 has decided to share our method for making ropes with the FRC community.
Triple Helix mentor Todd Ferrante presents on the team’s linear actuator designs at the 2016 FIRST Chesapeake FRC Workshops at Virginia Commonwealth University in Richmond, Virginia. In the talk, Todd describes the linear actuator design that was used in both our 2015 robot, to raise and lower the cans, and in our 2016 robot, in the climber mechanism. The accompanying video shows examples of this device in action.
Triple Helix students Ben Bretton, Sam Tatum, and Gabe Odachowski present on the team’s summer 2016 project to develop a gas-powered robotic ground vehicle. The talk was given at the FRC Summit at Christopher Newport University to an audience of other Hampton Roads FRC students and mentors.