CNC Test

Every program number

starts with the letter O

Data Processing Unit (DPU)

Reads the part program

N135 G01 X1.0 Y1.0 Z0.125 T01 F5.0

The first set is the (1) block number. The second set is the (2) G-code. The next three are (3) coordinates. The fifth is the (4) tool number. The last set is the (5) special function.

In a part program a block is equivalent to

a line of codes

Numerical Control

a method of automatically operating a manufacturing machine based on a code of letters, numbers,and special characters.

what is an ATC?

automatic tool changer

On CNC the y axis goes __, the x axis goes __, the z axis goes __.

forward and back, side to side, up and down.

Two types of control systems

(1) Point-to-point and (2) Continuous-path

Machine Control Unit (MCU)

Brain of the NC machine

Continuous-path controllers

Causes the tool to maintain continuous contact with the part ad the tool cuts a contour shape.

Point-to-point controllers

Causes the tool to move to a point on the part and execute an operation at that point only. The tool is not in continuous contact with the part while it is moving.

CNC

Computer Numerical control

Control Loop Unit (CLU)

Controls the Machine tool operation

Examples of Point-to-point controllers

Drilling, reaming, punching, boring, and tapping

Basic Safety Line (always use)

G17 G40 G80 G90

What is an MCU and what is its function?

Machine Control Unit; it creates and stores a CNC program

Examples of Continuous-path controllers

Milling along any lines at any angle, milling arcs, and Lathe turning