[Handheld Screwdrivers] [Stationary Screwdriving Spindles] [Selection program: InsertingTools] [Measuring Technique]
Torque Transducers
In most situations, the essential element of screwdriving technology is torque. Controlling the torque generated by the screw-driver and inspecting the finished screw joint requires a suitable torque transducer. A torque transducer is a device that creates an electrical signal that is proportionate to the torsional load on the transducer. Technical tips on torque control are avilable in our leaflet D 0080 E.
Torque transducers vary widely in operation and appearance, and work on many different physical principles. The most common of these are:
a strain gage wrapped around a torsion bar, an eddy current transducer, a mechanical (spring or hydraulic) element, and a piezo-electric crystal.
To be effective, the torque transducer must have the following attributes. It must support a sampling rate that will allow the measurement of rapidly changing loads, it must be sufficiently stiff to withstand the peak load, it must have a high degree of linearity, it must be stable under varying environmental conditions, and it must have a good operating lifetime.
offers torque transducers that work on two different physical principles, both meeting these requirements.
- PE (Piezo Electric) Transducer
- DMS (Strain Gage) Transducer
When connected to the correct measuring instrument, each type of torque transducer has applications in the screwdriving technology. The familiar DEPRAG piezoelectric transducer offers a large measuring range and a robust design. For less demanding applications, the strain gage transducer offers an economical alternative.
Torque transducers are available as stationary platforms as well as in portable version of straight and angular torque wrenches. Depending on Piezo-electric or strain gage version the transducers are built to be connected to the relative electronic torquemeters (see brochure D3022 E).
The measuring platforms are well suited for the installation into a calibration laboratory, as well as for the construction of a mobile measuring waggon. The robust and sturdy platform design guarantees permanent high measuring accuracies. As an optional accessory, we offer a clamping plate, which allows the temporary fastening of the platform into a vice. For specially high accuracy demands, or for the obtaining of extremely small torque values, we recommend to mount the platform with its polished lower surface to a table top, which has been treated in a similar fashion.
Because of such an extreme high grade installation, even the smallest measuring-errors, created by lateral force, deflection, vibration, or misalignment, can be completely avoided.
The torque wrenches allow the testing of screwdriver-spindles without their removal from an assembly station. Because of the incorporated flat surfaces on the side of the wrench head, our torque wrenches can be temporarily clamped into a vice. In connection with the corresponding torque measuring instrument (DME 200 PC), the torque wrenches can also be used for the testing of a screw connection already, by either tightening or loosening the connection.
The torque wrench combines the application variety of conventional torque wrenches with the precision and the possibilities of upto-date electronic torque measurement.
The mechanical torque wrenches (manual indicator design) can be used for simple adjustment or control tasks. To obtain the torque of a screw connection, simply re-tighten the fastener. The use of a mechanical torque wrench allows the fast appraisal of tightening torque values.
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Catalog D3020 
PDF - Catalog : German