What Is a Torque Screwdriver?
A torque screwdriver is a screwdriver designed for precise tightening to a specific torque.
It is an essential tool for tasks that demand accuracy in torque application. Torque screwdrivers can be set to specific torque values.
Correct torque application prevents damage or breakage of components. Additionally, torque screwdrivers provide consistent torque, independent of the operator’s strength, contributing to improved work quality and reliability.
Uses of Torque Screwdrivers
Torque screwdrivers have a wide range of applications, with a common use case being machine maintenance, especially in the automotive industry.
1. Automotive Industry
Torque screwdrivers are invaluable for tightening various automobile components, such as wheel nuts and suspension parts. Precise torque application ensures safety and prevents damage or loosening of parts.
2. Aerospace
In the aerospace industry, torque screwdrivers play a crucial role in maintenance and servicing. Aircraft components require precise torque control to ensure reliability. Torque screwdrivers may also be used during the production of various industrial products.
3. Electronics
In the electronics field, torque screwdrivers are commonly used for assembling motherboards in computers and mobile devices. They are also employed when tightening larger mechanical components like cylinder heads and crankcases to specific torque values.
Principle of Torque Screwdrivers
Torque screwdrivers typically employ a spring mechanism. This spring is positioned between the body of the torque screwdriver and the screwdriver head, compressing or extending when rotary force is applied.
When a certain rotational force is applied to the spring, the internal mechanism signals the user through a clicking sound and tactile feedback. This ensures that tightening is performed at the designated torque value.
Additionally, torque screwdrivers feature a torque setting mechanism, often with a torque adjustment knob or dial that can be set to the desired torque value. Some torque screwdrivers include a release mechanism that disengages and clicks out if over-torquing occurs.
Types of Torque Screwdrivers
There are various types of torque screwdrivers, each with distinct characteristics. Here are examples of different types:
1. Digital Type
Digital torque screwdrivers are equipped with a liquid crystal display and can monitor real-time torque during tightening. They allow the operator to set a target torque, providing feedback through sound or other means when the target is reached. Digital models use advanced sensors and control circuits for precise torque control.
Some digital models can also record torque data, storing torque values, operation dates, and times. This is valuable for quality control and troubleshooting.
2. Pre-set Type
Pre-set torque screwdrivers have a dial or similar mechanism for specifying torque. They do not require batteries, ensuring no risk of power depletion. Many pre-set types are non-reversible and cannot tighten further once the set torque is reached.
3. Single-Function Type
Single-function torque screwdrivers do not have adjustable settings and are calibrated using a torque screwdriver tester or similar equipment. These are used for repetitive tasks where the specified torque remains constant, providing error-proofing for operators. In many cases, torque can only be applied in one direction, typically in the clockwise tightening direction.