Sensors for Force Measuring

Strain Gauge based Sensors:

Sensors based on strain gauges are suitable for all cases, which involve any elastic deformation, like torsion, feed force or surface strein. They achieve an excellent linearity and repeatability over extended periods of time. Three variants are available:

• FFR (Feed-Force-Ring / Wheatstone) for integration into spindles and feed axis
• FFP (Feed-Force-Plate / Wheatstone) for integration below turrets
• STS-11/STS-17/STS-23 (surface strain / strain gauge technology) for mounting with 2 screws on suitable machine parts for detection of elasticity and mechanical stress

The sensor are connected to a measuring amplifier for strain gauges (BA-01) or direct to a GENIOR MODULAR module (GEMGP). These combinations achieve a high sensitivity for the detection of small force and strain variations (tool contact, rolling, finishing and hard turning) so that deviations are indicated early.

The DDU rotor is another strain gauge application that provides long-term signal stability and is used to calibrate the force and torque ranges during threading and finishing.

Piezoelectric Force Sensors:

Piezoelectric sensors are typically used to detect dynamic forces, e.g. collisions. They are even more powerful than strain gauge sensors, but only suitable for short cutting cycles. Ring-shaped sensors are used on revolvers or spindles:

• RS-M10/RS-M12/RS-M16: these ring-shaped force sensor with integrated charge amplifier are typically fitted under M10, M12 or M16 screws directly to the turret or the spindle
• CFW: force sensor similar to the RS-series, but without integrated charge amplifier. In this case a digital charge amplifier needs to be connected: CMD-600 (IP65)
• ADS-31: a sensor for measuring the surface tension of metal constructions. This sensor needs to be connected to a measuring transducer (CFM-4 or FM-01)