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Welcome to the technical reference wiki for Duke Combat Robotics. If you want general information about the team, see our website.

Semester ant-weight build schedule

Students work in groups of 1-4 to build an ant-weight (1lb) combat robot, with an internal competition being held at the end of each semester. Students are strongly encouraged to keep to the following schedule to ensure they end up with a robot they can be proud of!

Week	Fall dates	Spring dates	What to work on
	late August - early September	mid January	(Pre-season: first ~3 weeks of classes)
1-2	mid September	late January - early February	Wiring harness, "scrap bot"
3-5	late September - mid October	mid-late February	Research and design of prototype bot. Figure out overall shape, how to attach motors, etc. SendCutSend* order #1 happens at end of week 5
6-9	late October - early November	March	Fabricate and assemble full robot in detail, test it in the box, see what's bad, fix it, etc. SendCutSend* order #2 happens at end of week 9
10-12	mid-late November	early-mid April	Do test skirmishes with your robot, refine as needed.
13	early December	late April	Competition! Typically the first Saturday or Sunday of undergrad reading period.

* SendCutSend is a commercial service that offers precision cutting of many materials. We especially use them to order laser cut AR500, an armor plating steel suitable for combat robot weapons. See technical tutorials below for details.

Making your first combat robot

Our internal competition is for antweight robots, meaning a weight limit of 1 lb (454 g). We follow the SPARC rules, which you should read (they're not long).

This tutorial assumes you're making the most common type of antweight design: two drive wheels and one weapon motor with a spinning kinetic weapon. You don't have to make a bot like that, but it's a good place to start.

Components and general layout

2S LiPo battery

The basic combat robot doesn't have any code or autonomy -- it's plain remote control, like an RC car. We use the following components:

1. Lithium Polymer (LiPo) batteries, typically of the "2S" (7.4V) variety. These connect with a yellow XT30 plug, but also have a white connector used only for charging.
   • NOTE: LiPo batteries can be dangerous! Don't over-drain them, puncture them, or short them out. If you do, they may swell, become hot, and even shoot fire. Dangerous-looking batteries go in the "oh crap" metal box in the Foundry, or in the team's sand bag.
2. 

   N20 brushed DC motor
   Brushed DC motors for drive. We typically use "N20" model motors, which have a little integrated gearbox.

Fabrication tips

TPU

Weapon hubs

Advanced material selection

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