CNC Controls: Fanuc

Fanuc Mill: Entering Offsets 260

This class provides step-by-step instructions for adjusting offsets on the Fanuc 0-C mill control during a production run.

  • Difficulty Beginner

  • Format Online

  • Number of Lessons 13

  • Language English

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Course Outline
  • Objectives
  • Offsets for Milling
  • Types of Offsets
  • Tool Changes
  • Viewing Offsets
  • Navigating Offsets
  • Work Offsets
  • Adjusting Work Offsets
  • Tool Length Offsets
  • Adjusting Tool Length Offsets
  • Cutter Compensation Offsets
  • Adjusting Cutter Compensation Offsets
  • Summary
Objectives
  • Describe the main purpose of offsets.
  • Distinguish between the types of offsets on the Fanuc 0-C mill control.
  • Describe a tool change on the Fanuc 0-C mill.
  • Describe how offset screens are arranged on the Fanuc 0-C mill control.
  • Explain the steps for navigating through various offsets.
  • Describe work offsets.
  • Explain how to adjust work offsets on the Fanuc 0-C mill control.
  • Describe the steps for determining a tool length offset.
  • Explain how to adjust tool length offsets on the Fanuc 0-C mill control.
  • Describe the steps for determining cutter compensation.
  • Explain how to adjust cutter compensation offsets on the Fanuc 0-C mill control.
Glossary
Vocabulary Term
Definition

[OFFSET]

A chapter selection soft key that displays the tool geometry offset screen.

[WORK]

A chapter selection soft key that displays the work offset screen.

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.

block

A single line of a part program.

cursor keys

The up and down arrow keys located on the MDI keypad that enable an operator to move through various screens and fields in the control, edit and search for CNC programs, and move the cursor through the program or screen options.

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-axes.

diameter

The distance from one edge of the circle to the opposite end through the center. The diameter is always twice the size of the radius.

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.

lot

The number of similar parts made with a particular tooling setup.

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.

offset

A numerical value stored in the CNC control that repositions machine components. Offsets are used to adjust for differences in tool geometry, part size, tool wear, etc.

offset register

Area of the machine control that holds tool geometry, wear, and work offset settings.

ofset key

A function key located on the MDI keypad that displays tool offsets and settings.

page keys

The up and down arrow keys located on the MDI keypad that allow an operator to move through various screens and fields one page at a time.

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.

radius

The distance from the center to the edge of a circle.

soft keys

Keys located directly below the display screen that have different purposes depending on which function key has been chosen. The function of each soft key is visible on the display screen between brackets.

tolerance

An unwanted but acceptable deviation from a given dimension. Tolerances indicate the allowable difference between a physical feature and its intended design.

tool change sequence

Stored information in a part program that executes a tool change. Tool change sequences are actuated by the M06 command.

tool geometry offset

Any offset that adjusts machine components to compensate for the unique shape of a particular cutting tool. On the mill, the geometry offsets are tool length and cutter compensation offsets.

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.

tool magazine

An arrangement of multiple tools that allows a CNC machine to rapidly change from one machining operation to the next.

wear offset

An offset that allows for the slight adjustment of the cutter location. Wear offsets account for part deflection, tool wear, etc.

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.

workshift 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.