Project: Tic-Tac-Toe Board

Figure 1: Tic-Tac-Toe Board

Narrative

You will design and manufacture a tic-tac-toe game. This project will involve all aspects of CIM. Product design will be done using CAD; tool paths and CNC program will be generated using CAM. Finally, the parts will be manufactured using the CNC mill.

In this project you will design two game pieces, each with a distinctive shape. You will then combine these two shapes to form an outline of the pocket for the game board. This pocket will be milled out to receive the game pieces.

Concepts

ExtrudeCNC codesEngraveMachine set-up

FilletFixturesPocket

Mass PropertiesStockTool paths

General Guidelines

Game Pieces:Piece 1 & Piece 2

  • Should be a simple geometric shape, such as one of the regular polygons.
  • You should be able to combine both shapes to form one pocket. You still need to be able to see part of the unique shape of both pieces in the shape of the pocket. See Figure 2.

Figure 2: Example

  • The material used will be either pine or butterboard.
  • The surface of the stock can be painted before milling, so the pieces will have a painted surface after machining.
  • You will cut out 10 pieces, 5 of each design.
  • The pieces will be cut with an engrave operation.

Playing Board

You will use two different milling operations for the game board. An engraving operation for the dividing lines and a pocket operation for the game piece pockets.

Geometric Requirements

Game Pieces:Piece 1 & Piece 2

  • CNC Operation:Engrave - .25” deep
  • Size: To be determined. Size of the pieces must be 2% smaller than
  • the game board so they will fit nicely inside the pocket.
  • Number required:10 pieces total – (5 of each design). The similar pieces will be engraved from one piece of wood.

Game Board

  • CNC Operation: Dividers – Engrave - .125” deep
  • Pockets – Pocketing -.125” deep
  • Size:.75” x 3.75” x 3.75”
  • Material: Pine or Butterboard
  • Slots:.125” x .125” x 3.75”

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Copyright 2006

CIM – Activities – Project: Tic-Tac-Toe Board (Student) – Page 1

Game Board Drawing

Project Lead The Way®

Copyright 2006

CIM – Activities – Project: Tic-Tac-Toe Board (Student) – Page 1

Figure 3: Layout

Inquiry

Solve the following using mass property function and the appropriate calculations.

  1. Find the volume of each of your game pieces.

______Piece #1 and ______Piece #2

  1. How much raw material would be necessary to produce the required number of pieces for 1,000 games?
  1. What would be the cost of the polyethylene required to produce the number of game pieces you calculated in Problem B?

Supplemental Information

  • The density of high-density polyethylene is 0.034 lbs. per cubic inch.
  • The price per pound of high-density polyethylene is ~ $2.25

Project Lead The Way®

Copyright 2006

CIM – Activities – Project: Tic-Tac-Toe Board (Student) – Page 1