How do you test for torque?

Torque testing measures the rotational force needed to turn an object, commonly utilized in the tightening of threaded fasteners. When a nut and bolt are tightened, the action generates tension within the bolt, which is crucial for ensuring clamping force between the connected components.

At Cell Instruments, we are dedicated to providing you with quality products at competitive prices alongside timely delivery.

Consequences of Over-Torquing

Over-torquing is a scenario where excessive tightness leads to the elongation of the bolt, ultimately compromising its strength and creating unreliable connections. On the other hand, insufficient torque can result in loose connections, which could vibrate free over time.

Torque testing for bolts, also referred to as fastener testing, is particularly vital in applications involving fastening mechanisms and components with rotating elements, such as motors. By measuring torque characteristics, the quality and possible defects of parts can be effectively examined.

Importance of Torque Testing

Many professionals may not realize that a bolt or nut does not conduct AC current effectively. The resistance of a bolt is significantly higher than that of two copper pieces in contact. Properly torquing a bolt increases pressure on copper connections, reducing resistance and allowing current to flow efficiently through the copper instead of the bolt.

The National Electrical Code mandates that all equipment must be installed according to specified torque settings verified during the process.

Advantages of Torque Testing

• Efficient energy usage is facilitated when connections are securely fastened, which is especially important considering the costs associated with electricity.
• Preventing fire hazards is a significant reason to engage in thorough torque testing. Poor contact can lead to arcing and overheating, resulting in fire risks.

Field assemblies must utilize the correct torque settings during fastening. Common items that require torque settings include:

• Breakers
• Ground bars
• Insulated lugs
• Compression fittings
• MSB bussing

Even though components are typically pre-torqued during manufacturing, it's crucial to check for looseness upon installation, necessitating a retightening to meet specified torque values.

Steps Involved in Torque Testing

During the torque testing process, it's essential to examine both loose and excessively tightened connections. A visual inspection may not always reveal issues such as stripped threads; therefore, careful evaluation is necessary. Key tools used during testing include:

• Torque wrenches
• Torque screwdrivers
• Socket sets
• Pliers

To ensure accurate torque readings, calibration of tools is crucial. New torque devices typically come calibrated for a full year and require annual recalibration by recognized companies.

The required torque specifications can usually be found on breakers or in the National Electrical Code Handbook, ensuring that the manufacturer's instructions are adhered to.

Methods to Conduct Torque Testing

Inadequate measurement of torque indicates a lack of quality control, which can lead to failures. There are three primary methods utilized during a torque test:

Movement Check

This involves using a torque meter wrench. By applying force in the fastening direction until movement is noted, the torque reading is taken to signify the initial torque applied.

Loosening Check

This technique mirrors the movement check but applies force in the opposite direction until the fastener breaks free. The torque reading noted at this moment indicates the initial applied torque.

Marking Check

In this simpler method, markings are made on both the fastener and the connected surface. By aligning the marks after retightening the bolt, the torque needed to return to its original position can be determined.

Typically, torque wrenches are the tools of choice for conducting these tests.

Torque Tester offers additional resources for anyone seeking more information.

• Use wrenches that read torque within their optimal capacity range.
• Ratchet extensions should not alter torque readings.
• Store wrenches with the spring set to zero when not in use.
• Follow all manufacturers' guidance during use.

Implementing a robust torque testing protocol ensures safety and quality control, as improperly tightened fasteners can lead to severe consequences. Proper torque assessments are fundamental for safeguarding the integrity of products.

For those looking for superior Textile Testing supplies, we are here to assist you in finding the right products.