![Table of Contents](Images/toc-up.gif)
![Introduction](Images/Intro-up.gif) ![Manual Operation & Start-up Procedures](Images/manop-up.gif)
![Programming in the ISO (EIA-274-d or G-code) Format](Images/pgrm-up.gif)
![Canned Cycles](Images/can-up.gif)
![Subroutines (Macros) and Loops](Images/sublp-up.gif)
![Console Editing](Images/coned-up.gif)
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![Definitition of TLOs: Please look up ( ^ ) and to the right](Images/define.gif)
![Procedure for setting TLOs](Images/set-tlos.gif)
![Running Programs](Images/run-up.gif)
![Data Transfer PC<---> CNC](Images/x-fer-up.gif)
![Demonstration Program](Images/demo-up.gif)
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Bridgeport
Heidenhain CNC Mill
Programming & Operating Instructions
Chapter 7
Setting Tool Length Offsets (TLOs)
Definition
Tool length offsets (TLOs) amount to nothing more than the jog distance the Z-axis must
travel from its fully retracted position to the position where the cutter makes contact
with a Z-zero reference surface (usually the top surface of the workpiece). This is
accomplished by "touching off" each cutter on the reference surface (using a
feeler gage) and loading the jog distance into the appropriate TLO register. When each
tool is "called," the appropriate TLO is accessed and used to offset the Z-axis
origin.
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Procedures for Setting TLOs
- Make sure the quill is fully retracted and the Z-axis register reads zero at that
position. If necessary, zero out the Z-axis register (in
Chapter 2).
- Load each cutter into a toolholder, making sure it is securely held so it won't slip in
use.
- Adjust the height of the table so that the longest cutter/toolholder assembly can be
installed in the spindle without interfering with anything.
- Press the HAND WHEEL OPERATION
key and press Z and keys to
make the Z-axis active.
- Hand wheel the cutter to the Z-reference plane, using a feeler gage such as a
0.100" gage block.
- Press the EDIT program
key and move the cursor to highlight the "L"
parameter in the appropriate Tool Definition block.
- Press the DATA TRANSFER
key to transfer the jog distance displayed in the Z-axis
counter into the Tool Definition block. Then press the EOB key.
- Retract the quill back to Z = zero.
- Repeat the process for each cutter.
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