Compact Precision: OTT-JAKOB Launches Power-Check Micro for Small Spindles

OTT-JAKOB Spanntechnik, the renowned German specialist in tool clamping systems, has introduced a new spindle clamping force measurement device—the Power-Check Micro. Designed for compact machine tools, this new addition complements the existing Power-Check 2 and Power-Check Magazine systems, which are commonly used for measuring drawbar force in larger spindle tapers such as HSK 160, BT, SK, and CAT formats.

The Power-Check Micro, by contrast, is purpose-built for smaller spindle interfaces—specifically HSK E15, E16, and E20—commonly found in high-speed, precision machine tools. These machines are prevalent in sectors such as dental and jewelry manufacturing, micro-electronics, aerospace, medical technology, and miniature tool and die production, where accuracy and repeatability are paramount.

Exclusively distributed in the UK and Ireland by Gewefa UK, the Power-Check Micro supports the growing demand in micro-manufacturing for process reliability, condition monitoring, and preventative maintenance. Compact and lightweight—measuring just 48.8 x 43 x 41.5 mm and weighing around 200g—the device is ideal for use in tight working environments. It operates independently of mains power using two replaceable lithium batteries, offering up to 1,000 hours of use.

The system supports interchangeable screw-on adapters for different HSK sizes and is compatible with clamping systems from all tool manufacturers. Like its larger counterparts, it measures the axial pull-in force exerted by a machine’s drawbar to ensure secure tool clamping. Deviation from optimal clamping force can lead to tool wear, vibration, surface quality issues, or tool failure—issues that are particularly critical in high-precision applications.

Notably, the Power-Check Micro can simulate variations in tool holder dimensions using a unique adjustment ring graduated in 0.05mm increments, allowing the user to mimic tolerance differences up to ±0.2mm—ensuring more realistic testing conditions than systems that rely solely on nominal dimensions.

The device is manually inserted and should never be used with an active spindle or during automatic tool change. Once in place, it transmits data wirelessly (2.4GHz) at one reading per second to a compatible receiver. Several transmission modules are available, including USB and IO-Link options, for seamless integration with digital manufacturing systems.

Offered as a standalone device or in a complete kit—with rugged case, batteries, PC software, and USB receiver—the Power-Check Micro brings simplicity, precision, and reliability to small-format spindle force monitoring. Annual recalibration and regular checks are recommended to maintain peak performance.