Contrinex Launches High-Precision Spindle Travel Sensor

Contrinex has introduced a new inductive smart measurement travel sensor designed for high-precision drawbar position monitoring in machine tool spindles. Available with both analog and digital outputs, the sensor features a measuring range of 0 to 20 mm, a standard resolution of ±25 µm, and a repeatability of ±75 µm. The digital output variant provides a dynamic resolution of ±5.5 µm, enabling real-time, continuous monitoring of the drawbar position during the machining process and throughout automated tool changes. Engineered for harsh industrial environments, the device boasts an IP67 protection rating and operates reliably in temperatures ranging from -25 °C to +90 °C. The company will showcase the new sensor at the upcoming SPS exhibition in Nuremberg.

Serving as an intelligent alternative to conventional multi-sensor configurations, the single travel sensor can replace multiple discrete switches, significantly reducing component count, wiring effort, and required installation space inside the machine frame. It offers three factory-set switching points (5 mm, 10 mm, and 15 mm) in both Single Point and Window modes, which can be freely programmed and integrated into the process data. Additionally, the sensor's ACS function allows operators to program five specific position and voltage points to define the analog output curve. Configuration is streamlined using the Contrinex PocketCodr handheld IO-Link device, ensuring quick setup and maximizing overall machine tool efficiency.

Additional Context
This section provides technological and market background not explicitly detailed in the original release.

In automated CNC machine tools, the drawbar mechanism securely clamps the tool holder inside the spindle using heavy-duty spring stacks. Precise monitoring of this stroke is critical for safety and process reliability; if a tool is improperly clamped, it can lead to severe machining chatter, ruined workpieces, or catastrophic tool ejection at high rotational speeds. Traditionally, machine builders relied on an array of discrete inductive proximity switches to detect specific states, such as "clamped," "unclamped," or "clamped without tool." By transitioning to a single, continuous-measurement smart sensor with IO-Link capabilities, manufacturers not only eliminate the mechanical complexity of multiple switches but also gain the ability to monitor gradual mechanical wear, spring fatigue, and thermal expansion within the spindle assembly over time.

Edited by Lekshman Ramdas, Induportals editor – adapted by AI.

www.contrinex.com