What is the definition of "work offset"?
An offset used to adjust the location of every tool loaded in the turret. On the lathe, the work offset is typically added only for the Z-axis.

## CNC Controls: Haas 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: Haas Lathe: Locating Program Zero 275 Description: This class describes how to determine work offsets and tool geometry offsets on the Haas lathe during setup. Includes Haas CNC Simulators. Difficulty: Intermediate Number of Lessons: 14 Language: English, Spanish

Class Outline
• Objectives
• What Is Program Zero?
• The Work Coordinate System
• Considerations for Selecting Program Zero
• Tool Geometry Offset Methods
• Determining Tool Geometry Offsets: Off the Machine
• Determining Tool Geometry Offsets: On the Machine
• Entering Tool Geometry Offsets: Z FACE MESUR and X DIA MESUR
• Determining Tool Geometry Offsets: Tool Pre-Setter
• Entering Tool Geometry Offsets: Tool Pre-Setter
• Determining Work Offsets
• Entering Work Offsets
• Entering Radius and Tip Offsets
• Summary

Class Objectives
• Compare program zero to machine zero.
• Describe the work coordinate system.
• Identify common locations for program zero on the lathe.
• Identify common methods for setting tool geometry offsets on the lathe.
• Describe how to determine tool geometry offsets for tools off the lathe.
• Describe how to determine tool geometry offsets manually on the lathe.
• Explain how to use the Haas control to enter tool geometry offsets with the Z FACE MESUR and X DIA MESUR features.
• Describe how to determine tool geometry offsets with the tool pre-setter.
• Explain how to use the Haas control to enter tool geometry offsets with the tool pre-setter.
• Describe how to determine a work offset on the lathe.
• Explain how to use the Haas control to enter a work offset using Z FACE MESUR.
• Explain how to use the Haas control to enter matching radius and tip offsets.

Class Vocabulary

Vocabulary TermDefinition
A key that sets the HANDLE increment to .0001 inches or .001 mm for each division of the HANDLE.
A key that sets the HANDLE increment to .01 inches or 0.1 mm for each division of the HANDLE.
An imaginary straight line that runs through the center of a cylindrical part. On the lathe, the centerline is parallel to the Z-axis.
A key in the LIST PROG mode key row that clears the last MDI line when in MDI mode.
A function key that, when entering tool geometry offsets on the Haas lathe, inputs the machine's pre-defined centerline offset value.
Part of the Haas control panel that moves the machine components along the axes. The handle clicks in controlled, measured increments that an operator selects on the keypad.
The interior surface of a hole or cylindrical feature.
A temporary location on a computer that holds all incoming information before it continues to the CPU for processing.
A document that includes all manufacturing specifications for a lot of parts.
An unchangeable coordinate system that has machine zero as its origin.
The position located at the farthest possible distance in a positive direction along the machine axes. This position is permanently set for each particular CNC machine.
An operation mode key that lets an operator either enter and execute program data without disturbing stored data when pressed once, or execute programs from a centrally located computer storage device when pressed twice.
A key on the Haas lathe that is used when setting tool geometry offsets to index the turret to the next sequential tool.
The display key on the Haas control that shows the various programmed offsets.
The exterior surface of a cylindrical feature.
A series of 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.
Tooling used with the lathe that consists of separate clamping units and cutting heads that are interchangeable. The position of each cutting edge is held to very tight tolerances.
An offset used on the lathe that slightly adjusts the tool to compensate for the rounded tip of an insert during contouring, chamfering, and other multi-axis operations.
The square-shaped tip at the end of the tool pre-setter that records a tool's offset position once the tool contacts one of its four edges.
An offset used on the lathe that indicates one of nine possible orientations for a particular tool. Tip offsets are used in conjunction with radius offsets.
An offset used on the lathe that accounts for variations in tool length along the X- and Z-axis. Each tool loaded in the turret requires its own geometry offset.
The rounded tip on the cutting edge of a single-point tool. The greater the nose radius, the greater the degree of roundness at the tip.
A device on the lathe used to quickly determine tool geometry offsets on the X- and Z-axis. The tool tip contacts the stylus of the probe, which instantly records the turret position in the offset screen.
A key on the Haas lathe that indexes the turret to the next sequential tool.
A variable coordinate system that has program zero as its origin.
An offset used to adjust the location of every tool loaded in the turret. On the lathe, the work offset is typically added only for the Z-axis.
A key on the Haas control that acts as a general enter key.
A key on the Haas lathe that automatically stores the X-axis position as a tool geometry offset for a tool that is properly touched off the workpiece surface. X DIA MESUR prompts the operator for a diameter measurement.
A key on the Haas lathe that automatically stores the Z-axis position as a tool geometry offset for a tool that is properly touched off the workpiece surface. Z FACE MESUR is also used to set a Z-axis work offset.