CNC Training

--- Work in Progress ---

Goals of CNC training

CNC is all about processing gcode. The process is -

1. Design
2. Convert
3. Cut

Design Options

• Inkscape
• TinkerCAD
• Sketchup
• AutoCAD
• Other CAD software

Convert

• gcodetools
• CAMBAM
• ???

Cut

• Mach3
• LinuxCNC

Using Mach3

• Pin/Port, motor, and GCODE configuration
• Jogging the machine
• Setting the home point
• Testing the cuts
• Changing the bits
• Dust collection
• Changing the speed
• Rewind/Reset
• The STOP button and limit switches

Preparing the machine

• NEVER move the motors manually while connected to control box - it can damage the electronics.
• Zero the spindle high above
• Test the gcode
• Zero the spindle for real
• Monitor the cut, adjusting speed as needed.

Preparing the workpiece

• double sided tape
• screws (and sanding smooth)
• clamps and dog holes?
• vacuum table would be cool
• dust control
• Leveling the table to the gantry

Common problems

• Run out
• Bad gcode
• Bad cuts - too fast, too dull, too deep
• wrong units (mm vs inches)
• wrong arc method (absolute vs relative)
• stuck limit switch
• cheap control box (prone to break or overheat?)
• watch out for obstructions (this also means screw and clamps)