A split beam torque wrench works by using the difference in deflection between two beams to indicate the applied torque.
Understanding the Basic Principle
Unlike traditional beam wrenches, a split beam torque wrench features a simpler design with fewer parts. It utilizes two beams to measure torque:
- The main beam: This beam has the handle that you use to apply force. When you apply force to the wrench, the main beam flexes or bends.
- The indicator beam: This beam is partially attached to the head and serves as the indicator beam. It is designed to remain relatively rigid or deflect differently compared to the main beam.
The Mechanics of Torque Measurement
When you apply force to the handle, the main beam bends under the load. The indicator beam, being anchored near the wrench head where the socket attaches, deflects much less or stays relatively straight.
The end of the indicator beam points to a scale, often located near the handle or along the path of the main beam. As the main beam bends away from the straight indicator beam, the pointer on the indicator beam moves along the scale, showing the amount of torque being applied to the fastener.
Think of it this way:
- Applied Force -> Bends the Main Beam
- Indicator Beam -> Stays relatively straight
- Difference in Position -> Points to Torque Value on the scale
This method provides a direct, mechanical reading of the torque being exerted.
Key Features
Based on the reference, a notable feature is that it has fewer parts than the typical beam wrench. This can potentially contribute to simplicity and durability.
Split Beam vs. Traditional Beam
While both types use a flexing beam to measure torque, the split beam design separates the load-bearing beam (main beam) from the indicating beam (indicator beam). This can lead to a clearer scale reading as the pointer is part of a separate, less deflected component.
In summary, a split beam torque wrench uses the principle of a flexing main beam and a relatively stable indicator beam, with the difference in their positions registering the applied torque on a scale.
