Agenda¶

1. Administrative

   1. Please wear your name tag one more day.
   2. Various toys are on order.

2. Assignments

   1. If not yet qualified on laser cutters: Fire Extinguisher Use, Part 1 and Fire Extinguisher Use, Part 2
   2. Mini-Project 1: Open-Loop Dynamic Performance
   3. Thursday: paper sketches for the parts you intend to build

3. In-class

   1. word of the day: degree of freedom (ok, phrase of the day)

      DOF	joint
      1	wheel, hinge, pivot, “revolute pair”
      1	slider, “prismatic joint”
      1	screw
      2	cylindrical
      3	planar
      3	ball and socket, “spherical”
      6	“free”, rigid body unconstrained in space

      Trickier: how many DOF in a flexure joint?

      How many DOF in a lake of water?

   2. basic properties of stepper motors

   3. intro to our stepper motor system

      1. brief demo
      2. hardware: see CNC Arduino Shield
      3. software: see Sample Code Documentation

   4. individual project group meetings

   5. if needed: laser-cutter operational tutorial (roughly half the class)