## CNC Training

Class Information
 Tooling U-SME classes are offered at the beginner, intermediate, and advanced levels. The typical class consists of 12 to 25 lessons and will take approximately one hour to complete.
 Class Name: CNC Coordinates 140 Description: This class explains the arrangement and orientation of the basic axes on a common CNC lathe and both a vertical and horizontal CNC mill. Includes an Interactive Lab. Prerequisites: none Difficulty: Beginner Number of Lessons: 16 Language: English, Spanish, Chinese

Class Outline
• Objectives
• CNC Coordinates
• The Axes and Origin
• Positive and Negative Directions
• Coordinates in Blueprints
• Incremental Coordinates
• Absolute Coordinates
• Rotational Axes
• Contouring
• Coordinate Standards for Machines
• Standard Axes Locations
• Coordinates for the Vertical Milling Machine
• Coordinates for the Horizontal Milling Machine
• Coordinates for the Turning Center
• Machine Zero and Program Zero
• Summary

Class Objectives
• Describe the role of coordinates in CNC.
• Identify the three axes of the Cartesian coordinate system.
• Identify positive and negative directions along axes.
• Describe the relationship between measurements on the drawing and coordinates.
• Define incremental coordinates.
• Define absolute coordinates.
• Describe the rotational axes.
• Describe contouring.
• Describe the importance of coordinates for CNC machines.
• Identify the general rules for axis location.
• Identify the axes for the vertical milling machine.
• Identify the axes for the horizontal milling machine.
• Identify the axes for the turning center.
• Define machine zero.
• Define program zero.

Class Vocabulary

Vocabulary TermDefinition
A rotational axis that describes motion around the X-axis.
A series of numerical positions that are calculated from a fixed point of origin.
An imaginary line that passes through the center of an object. Axes are used to measure the distances of objects in the Cartesian coordinate system.
A rotational axis that describes motion around the Y-axis.
The numerical system that describes the location of an object by numerically expressing its distance from a fixed position along three linear axes.
A rotational axis that describes motion around the Z-axis.
A type of programmable control system, directed by mathematical data, which uses microcomputers to carry out various machining operations.
Tool movement along two or more axes at the same time to generate curved, non-linear features.
An organization that sets standards for technology industries.
A milling machine with a spindle that is parallel to the ground and a worktable that is positioned vertically.
A series of numerical positions that use the previous position as the point of origin.
A movement along two or more axes simultaneously that creates a straight line.
The position located at the farthest possible distance in a positive direction along the X-, Y-, and Z-axes. This position is permanently set for each particular CNC machine.
A sophisticated CNC mill that can perform multiple machining operations in the same setup with a variety of tools.
The fixed, central point in the Cartesian coordinate system. The origin has a numerical value of zero.
A series of numerical instructions used by a CNC machine to perform the necessary sequence of operations to machine a specific workpiece.
The position that acts as the origin for the part program of a particular workpiece. This position is unique to each workpiece design, and it is selected by the part programmer.
An angle formed by two lines that are perpendicular to one another. The corner of a piece of paper forms a right angle.
A quick reference that shows the location of the X-, Y-, and Z-axes. A person displays his or her right hand, and the first three fingers from the right each represent the X-, Y-, and Z-axis in order.
The axes that describe turning or rotation around the linear axes.
The main component of the machine tool that rotates. On the machining center, the spindle holds a cutting tool. On the turning center, the spindle holds the workpiece.
A sophisticated CNC lathe that specializes in turning, boring, drilling, and threading operations, all at the same location.
A milling machine with a worktable that is parallel to the ground and a spindle that is positioned vertically.
A part that is being worked on. It may be subject to cutting, welding, forming, or other operations.
The table that supports a workpiece during a manufacturing operation.
The linear axis representing motions and positions that travel the longest distance parallel to the worktable.
The linear axis representing motions and positions that travel the shortest distance parallel to the worktable.
The linear axis that represents motions and positions perpendicular to the worktable. The Z-axis is always parallel to the spindle.