The CNC Mill System (Light Duty), Model 5400, provides training in computer-aided manufacturing (CAM) with a microprocessor-driven CNC Mill (Light Duty). The system allows students to practice computer numerical controlled (CNC) code programming and editing, learn to operate mill components, controls, and tools, set a programmed reference zero, follow the steps necessary to machine a part to programmed specifications, and apply the machine code language to current mill technology.

The CNC mill can machine pieces of soft materials such as wax and plexiglass, as well as harder materials such as aluminum and brass. It consists of a milling table, a headstock carrying the spindle motor, and a vertical column with dovetail slide. The stock can either be mounted directly on the mill table or secured in a vise that holds it to the table. Two lead screws, each driven by a stepper motor, are used to move the table along the X axis (left and right) and Y axis (backward and forward) to feed the stock through the periphery of the end mill. A third lead screw, also driven by a stepper motor, is used to move the headstock along the Z axis (up and down) for positioning the end mill. The speed of each stepper motor can be programmed separately for feed rates up to 356 mm/min (14 in/min). A 160-W (0.21-hp) motor rotates the spindle at speeds programmable up to 2800 r/min. The end mill can be changed to accommodate different stock materials and milling designs.

A computer (not included) is used to create NC part programs with the G and M machine codes or their conversational code équivalents. The created programs are downloaded to the on-board microprocessor of the CNC mill, which stores and executes them. Since the CNC mill connects directly to the serial or Ethernet port of a computer, or directly to a network, no additional interface card is required. The computer is free to be used for any additional applications, since it is not dedicated to the control of the mill.

Features & Benefits
- Key-released emergency stop push-button
- Ability to restart programs from stopping point after safety interruption
- On-board embedded microprocessor
- Stand-alone manual mode operation
- Batch mode for independent operation or operation in CIM Cells
- Software allowing the programming of up to 20 tools
- Mill constructed with machined high-grade alloy bed and head stock
- 12-key membrane keypad with 20-character by 4-line LCD display
- Main power indicator
- Feed rate override
- Spindle speed override
- Stall indicator
- Removable side panel for access to robot
- Connects to host computer through RS-232 or Ethernet port

Topic Coverage
- History of CNC
- Identify Components of a CNC Mill
- Safety
- Speed, Feed, and Cut Steps
- Enter a Program into a Computer
- Identify and Operate Controls on a Mill
- Identify X, Y, and Z Axis Movements on a Mill
- Set-Up Controller and Mill to Machine a Part
- Write and Execute a Program to Mill a Shoulder and Drill a Hole
- Write and Execute a Program to Mill a Pocket
- Calculate and Program Cutter Clearances
- Combine Subroutine and Repeat Loop Operations to Machine a Complex Part