Torque, the rotational equivalent of linear force, is critical in countless applications. Ensuring proper torque is essential for safety and performance. This guide focuses on torque testers, including torque meters and gauges, used specifically for testing and calibrating torque-controlled tools, such as various types of torque screwdrivers and torque wrenches.

Understanding the Terminology: Gauges, Meters, and Analyzers

These terms are often used interchangeably, but have subtle differences:

• Torque Gauge: A broad term for any device measuring torque. This can range from a simple dial indicator to a sophisticated electronic instrument. "Gauge" often implies a more basic, less precise measurement.
• Torque Meter: Usually a more precise, often digital, instrument for measuring torque. They often feature data logging, peak hold, and unit conversion. Consider it a more advanced torque gauge.
• Torque Analyzer: The most sophisticated instrument. Analyzers measure torque and analyze parameters like angle, time, and the dynamic behavior of the joint. They are used in critical applications.

Types of Torque Testers (for Testing and Calibrating Torque Tools):

This guide focuses on torque testers used specifically for testing and calibrating torque-controlled tools, excluding the tools themselves.

1. Electronic Torque Testers:

• Digital Torque Meters (for Calibration): These highly accurate digital meters are ideal for calibrating torque tools. They measure the torque applied by the tool being tested. Features like data logging enhance calibration.
• Torque Transducers (for Testing and Calibration): These highly accurate sensors measure torque and convert it into an electrical signal. Used with digital displays, they are essential for both static and dynamic torque measurement. In calibration, they are the "reference" standard. For testing, they integrate into fixtures to measure tool output.
• Rotary Torque Transducers (for Testing and Calibration): Specifically designed for rotating applications, these measure torque in rotating tools. They are crucial for testing and calibrating tools like electric screwdrivers and air-powered nut runners.

2. Specialized Torque Testers:

• Torque Calibration Systems: These systems calibrate other torque measuring devices, including the torque meters and transducers used to calibrate torque tools. They maintain a traceable chain of accuracy.

Selecting the Right Torque Tester for Tool Calibration:

Choosing the right tester for tool calibration depends on:

• Application: What torque tools are being calibrated (e.g., manual, electric, air screwdrivers, various torque wrenches)?
• Torque Range: What is the torque range of the tools being tested?
• Accuracy Requirements: How precise does the calibration need to be?
• Standards Compliance: Are there specific industry standards that must be met?
• Budget: How much is allocated for calibration equipment?
• Portability: Is a portable calibration setup needed?

Calibration and Maintenance (of Torque Testers):

Regular calibration of the torque tester itself is vital. This ensures accuracy of the tools it calibrates. Calibration should be done by a qualified technician using certified equipment, maintaining traceability. Proper maintenance ensures the tester's longevity.

Applications of Torque Testers (in Tool Calibration):

Torque testers are used to calibrate a wide range of torque-controlled tools, including:

• Torque Screwdrivers:
• Electric Torque Screwdrivers: Used in electronics and assembly where precise torque is crucial.
• Air Torque Screwdrivers (Pneumatic): Used in high-volume assembly due to their speed and power.
• Cordless Torque Screwdrivers: Offer portability and convenience for various applications.
• Manual Torque Screwdrivers: Used for precision work and delicate assemblies.
• Torque Wrenches:
• Click-Type Torque Wrenches: Common and versatile, providing a tactile "click" when the target torque is reached.
• Dial Torque Wrenches: Offer a visual indication of torque.
• Beam Torque Wrenches: Simple and durable, but can be less precise.
• Electronic Torque Wrenches: Offer high accuracy and features like data logging.

Conclusion:

Torque testers are essential for ensuring the accuracy and reliability of torque-controlled tools like torque screwdrivers and torque wrenches. Understanding the different types and their applications allows selection of the right tool. Regular calibration and maintenance of the torque tester are crucial. Investing in quality torque testing equipment is a vital investment.