1.3 Basic Explanation Of G & M Codes - Basic Mill Operator

The work offsets in the machine define:

The important starting points for the workpiece, as they relate to the Machine Coordinate System

When establishing work offsets, it is important to know the exact location of the cutting tool tip in relation to the face of the spindle. The length between the tip of the tool and the face of the spindle is called:

Tool coordinate or tool offset

Another useful display of coordinates is the Program Coordinate Display. The Program Coordinate Display will treat our workpiece as our new zero starting point.

True

The common language used to tell computerized machine tools how to make things is:

G-code

The basic milling machine is capable of moving in how many directions?

3 directions or axes

G-codes tell the machine how to behave or what to do. What do the M-codes do?

Act as switches that turn a function On or Off

When the table is positioned with both X and Y axes at the Zero position, table movement in either the X or the Y axis is in the positive direction.

False

There are 3 basic G-codes that we mention in the video. Those 3 codes are:

G01, G02, G03

When the machine moves, we describe the machine as moving in a specific axis. What direction is the X-axis movement?

Side to side

The 3 axes are X, Y, and Z. When all 3 axes are at 0.000 in the Machine Coordinate System, we call that position:

The Home Position

Both G- and M-codes can have letter addresses in the line of code that provide additional instructions to the machine.

True

Each line of code in the program gives the machine instructions what to do. The combination of codes M03 S2000 simply tells the machine to start the spindle rotating in the clockwise direction, at a speed of 2000 rpm.

True

For the Z axis, the Zero position is with the spindle all the way up, or at the top of travel. When the spindle is moved down, toward the table, the machine coordinate system for the Z axis gets more negative.

True

The Machine Coordinate System defines where the axes can move, and how far they have moved.

True

The Work Coordinate System tells the machine where the workpiece and the tools are in relation to the Machine Coordinate System:

True

There are two basic types of function codes used in CNC programming. Those code types are G and M codes.

True