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What is the definition of program zero?

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.

Learn more about program zero in the class "GE Fanuc Mill: Locating Program Zero 270" below.

GE Fanuc Mill: Locating Program Zero 270

CNC Controls: GE Fanuc Department

Class Information

Tooling U classes are offered at the beginner, intermediate, and advanced levels.
The typical class consists of 12 to 25 lessons and typically requires at least two hours of instruction time.

Class Name	GE Fanuc Mill: Locating Program Zero 270
Description	This class describes how to determine work offsets and tool geometry offsets on the GE Fanuc 0-C mill control during setup. *Includes GE Fanuc CNC Simulators.*
Prerequisites	320260
Difficulty	Intermediate
Number of Lessons	13

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Class Outline

Class Objectives

Objectives

What Is Program Zero?

The Work Coordinate System

Considerations for Selecting Program Zero

Determining Work Offsets

Adjusting Work Offsets

Determining Tool Length Offsets

Adjusting Tool Length Offsets

Methods for Offsetting the Z-Axis

Determining Work Offsets in the Z-Axis

Calculating Cutter Compensation Offsets

Adjusting Cutter Compensation Offsets

Summary

Compare program zero to machine zero.

Describe the work coordinate system.

Identify common locations for program zero on the mill.

Explain common methods for determining work offsets.

Explain how to adjust work offsets on the GE Fanuc 0-C mill control.

Describe how to determine tool length offsets.

Explain how to adjust tool length offsets on the GE Fanuc 0-C mill control.

Describe disadvantages for setting Z-axis offsets against the part surface.

Explain the steps for determining work offsets in the Z-axis.

Describe the steps for determining cutter compensation.

Explain how to adjust cutter compensation on the GE Fanuc 0-C mill control.

Class Vocabulary

Term	Definition
1-2-3 block	A precise metal block with dimensions measuring one, two, and three inches respectively. An operator can use a 1-2-3 block to touch off tools during setup.
center finding indicator	A measuring instrument that allows an operator to find the center of a hole on a part.
cutter compensation	An offset used on the mill that accounts for variations in tool diameter. Cutter compensation is necessary only for tools that travel in the X- or Y-axis.
dial indicator	A measuring instrument with a contact point attached to a spindle and gears that moves a pointer on the dial. Dial indicators have graduations that are available for reading different measurement values.
edge finder	A device used on a mill to locate the exact position of a part edge along the X-axis or Y-axis.
flange	A ring or collar surrounding the toolholder that allows the tool to be grasped by the toolchanger.
G28	The command code that defines program zero in a part program.
G30	The command code that places the X- and Y-axes in a temporary home position.
gage line	The imaginary line marking the portion of the toolholder that matches the bottom edge of the machine spindle.
job sheet	A document that includes all manufacturing specifications for a lot of parts.
machine coordinate system	An unchangeable coordinate system that has machine zero as its origin.
machine zero	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.
manual reference position return	A procedure for returning a tool to a position specified by a parameter. The manual reference position return switch is located on the machine operator's panel.
part program	A series of instructions used by a CNC machine to perform the necessary sequence of operations to machine a specific workpiece.
program zero	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.
reference plane	A surface chosen for touching off all tools on a mill. A reference plane can be defined relative to a vise, fixture, or object like a 1-2-3 block.
tool length offset	An offset used on the mill that accounts for variations in tool length along the Z-axis. Each tool requires its own offset, which is measured from the tip of the tool to the gage line.
work coordinate system	A variable coordinate system that has program zero as its origin.
work offset	An offset used to adjust the location of every tool loaded in the machine. On the mill, the work offset changes the position of the spindle in both the X- and Y-axes, and often the Z-axis as well.

What is the definition of program zero?

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.Learn more about program zero in the class "GE Fanuc Mill: Locating Program Zero 270" below.

GE Fanuc Mill: Locating Program Zero 270

CNC Controls: GE Fanuc Department

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.

Learn more about program zero in the class "GE Fanuc Mill: Locating Program Zero 270" below.