What Cause Tool Length Setter Collisions & How to Prevent

This article explores the potential causes of tool length setter collisions in CNC machines and how to avoid them.

The Nuts and Bolts of a Tool Length Setter

At the heart of a tool setter lies a highly accurate switch (probe). This probe utilizes a wear-resistant, pyramid-shaped tip made of cemented carbide to make contact with the tool. A flexible support rod transmits the contact force to the switch. The switch then sends a signal through a dedicated interface to the CNC system. This signal allows the system to identify the tool’s direction, calculate and adjust for any offsets, and ultimately achieve proper tool control.

For tools that spin, the tool setter not only measures and compensates for length variations but also for diameter variations (the difference between a tool’s two radii, divided by the axis offset value). This ensures the machine can create workpieces with the correct dimensions.

Preventing Tool Length Setter Collisions: A Watchful Eye is Key

Several factors can contribute to tool length setter collisions:

1. Incorrect Tool Dimensions:Inaccurate input of the tool setter’s diameter and length can lead to collisions.
2. Workpiece Miscalculations:Errors in entering the workpiece’s size and other relevant geometric data, along with improper initial positioning, can cause the tool length setter to strike the workpiece.
3. Machine Coordinate System Issues:An incorrectly set machine tool coordinate system or a reset machine zero point during machining can increase the risk of collisions, especially during rapid tool movements.
4. Tool Length Setter Malfunction:While less common, a malfunctioning tool length setter, such as a faulty switch or damaged probe tip, can provide inaccurate readings, leading to collisions.