Computer Numerical Control (CNC) Operators
Objectives
- Identify purpose of the control panel on a CNC machine
- Identify information displayed on digital readout panel
- Identify six things a CNC operator needs to know
- Define critical dimensions
- Understand importance of condition of the cutters
- Identify tool numbers
- Understand importance of surface finishes
Vocabulary & Abbreviations
Many companies manufacture Computer Numerical Control (CNC) machines. Each machine is different. Controllers are not the same. The CNC operator learns how to operate the CNC machine in the shop. The operator learns the controls for the machine they are working on.
Questions
The Control Panel
CNC machines have a control panel. It allows the operator to command or control the CNC machine. The control panel has buttons, knobs, switches, and keys. The operator uses the buttons, knobs, switches, and keys to control the CNC machine tool.
Some of the controls are for:
- starting and stopping
- starting the spindle rotation
- setting the speed rate
- setting the feed rate
- controlling the position of the quill along the Z axis
- selecting the axis
- using a coolant
- changing tools
There are many controls. The machine operator learns about each control on the machine.
Digital Readout Panel
CNC machines have control panels and digital readout (DRO) panels.
Most CNC machine tools have a digital readout display panel. The digital readout tells the CNC operator what the machine is doing. It tells the CNC operator the position of the quill over the part along X, Y, Z axes. For example, a readout might say:
X -1.2218
Y -6.0250
Z 3.000
The CNC operator knows the critical dimensions of the part. The CNC operator watches the digital readout panel to check that the machine is making the part correctly.
Questions
What does the CNC operator need to know?
The CNC operator needs to know:
- The control codes of the specific machine
- The critical dimensions for the part.
These are the most important dimensions. The operator checks the blueprints for the critical dimensions. The operator checks these dimensions on the first part that the CNC machine tool is making. If they are correct, the program is probably correct. If they are incorrect, the CNC operator stops the machine and gets the supervisor to look at the part. The operator gets help before the machine makes many inaccurate parts. - The condition and size of the cutters
If the cutters are dull, broken, or incorrectly sized, the part will not be accurate. The CNC operator uses vernier calipers to check the condition and size of the cutters. - The numbers for the tools and how to load the cutters in the tool carousel or turret.
The manufacture of a part may require several different operations and cutters. The CNC operator knows the numbers for the tools. The operator loads the cutters in the tool holders. Then the tool holders are loaded in the correct order of the operations to be performed. - Loading the program into the