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11.07 CNC Project Fabricated

Assignment Deliverables

  1. Completed CNC Project

Assignment Overview

  1. After your toolpaths are reviewed and confirmed and you have a reserved slot for the CNC machine, prepare your plywood and cut out the pieces for your project.
  2. Use the router table to remove tabs.
  3. Sand down rough edges.
  4. Assemble and glue your project. You can use fasteners as well as any other tool in the shop.

Securing the Work Piece on the ShopBot

On the laser cutter we merely set our piece inside the cutter and don’t need to hold it down. The CNC router is a much larger and powerful machine and will knock the workpiece all over the place causing damage and potential injury. We need to firmly secure our material to the router table before using the machine. It is important to make sure that any fasteners used to secure the workpiece do not come in contact with the spinning router bit.

The simplest way to secure the workpiece is with screws attached directly to the cutting surface. It is important to pre-drill holes through the material to avoid splitting the plywood. The pre drilled, or pilot hole, should be large enough that the screw spins freely in the hole but the head of the screw does not fit through. Screws function as clamps. If the screw cannot spin freely in the top piece of material, then it will not create a fully clamping force.

For pieces that would be marred by screw holes, a hold down clamp can be used. This is an L shaped piece of wood that has a rabbet, or L-slot, cut out of it that is shorter than the height of the material being held down. Then screws securely clamp the hold down to the cutting surface, thereby holding down the material.

Project Resources

CIA Fab Studios Online Store - link

The Fab Studios sells pre-cut half sheets of 1/2" and 3/4" plywood. You can purchase it online at the Fab Studios’ online store on myCIA.

Grading Rubric

All Pieces Cut Out30 points
Tabs Removed30 points
Sanded Smooth30 points
Project Assembled30 points
Surface Finish Applied30 points
Overall Function and Design30 points
Craft and Appearance30 points