Advanced Manufacturing Choices

1
Advanced Manufacturing Choices

• MAE 195-MAE 165
• Spring 2009, Dr. Marc Madou
• Review of CNC Machining
• Kevin Gubitz, Brian Eastman, Charles Murray

2
Table of Contents

• CNC Information
• Programming with CAM
• Setting up CNC Machine
• Running Machine

3
CNC Information

• CNC is a subtractive, serial, three dimensional,
  up to 5 axis, mechanical Machining process
• CNC machine is an acronym for computer
  numerically controlled machine
• For faster CNC machining a coolant is necessary
• CNC machining can reach ultra-precision relative
  tolerances
• The harder the material and the greater the tool
  contact with the material the slower the machine
  needs to run
• For most machining jobs, a sacrificial plate will
  be used. This is a piece of similar material
  placed under the work piece to protect the bed of
  the machine
• Tool materials need to be harder than the
  material of the work piece

4
Programming with CAM

• Design the part on Solidworks or another
  compatible software
• Transfer drawing to CAM software
• Simulate machining process on CAM software and
  save to a floppy disk

5
Setup CNC Machine

• Insert floppy disk into machine to load code
• Secure sacrificial plates and part to machine and
  align using dial indicator
• Locate edges using edge finder and input x and y
  origins into the computer

6
Setup CNC Machine

• Determine the z-origin for the first tool to be
  used with the height gauge and record into the
  computer
• Input tool information into computer, most
  importantly the tool diameter
• Repeat previous 2 steps for each tool to be used

7
Run CNC Machine

• Insert first tool into machine
• Set location to be used for tool changes
• Run simulation preview of the process
• Set default rpm and transmission speeds for the
  machine
• Run program

8
Run CNC Machine

• Change tool when prompted by computer
• Continue program
• Repeat until process is completed
• Perform tertiary machining to part
• Clean up lab
• Enjoy Part