What To Know
- Use a torque tester to apply a known torque to the wrench.
- As a general guideline, it is recommended to calibrate the wrench every 6-12 months or after any significant impact or damage.
- Remember, a well-calibrated torque wrench is a tool you can trust to get the job done right.
A torque wrench is an essential tool for ensuring precise tightening of bolts and nuts. However, over time, even the most reliable torque wrenches can become misaligned, leading to inaccurate torque measurements. This can have serious consequences, such as:
- Stripped or damaged bolts
- Loose or overtightened fasteners
- Equipment failure and safety hazards
How to Check if Your Torque Wrench is Calibrated
To prevent these issues, it’s crucial to regularly check the calibration of your torque wrench. Here are some simple steps to help you do it:
1. Visual Inspection
- Examine the wrench for any visible signs of damage, such as cracks or dents.
- Check the scale for any faded or unclear markings.
- Inspect the ratcheting mechanism for any binding or excessive play.
2. Torque Verification
- Use a torque tester to apply a known torque to the wrench.
- Note the reading on the wrench’s scale.
- The torque reading should be within the specified tolerance of the torque tester.
3. Break-Over Test
- Set the wrench to a low torque setting.
- Apply torque until the wrench “breaks over” (clicks or releases).
- Note the torque reading at which the wrench breaks over.
- The break-over torque should be within the specified range for the wrench.
4. Repeatability Test
- Set the wrench to a specific torque setting.
- Tighten a bolt to the desired torque.
- Repeat the process multiple times.
- The torque readings should be consistent within a small range.
5. Accuracy Test
- Use a calibrated torque wrench as a reference.
- Tighten a bolt to a specific torque using the reference wrench.
- Measure the torque applied by your torque wrench on the same bolt.
- The difference between the two readings should be minimal.
6. Professional Calibration
- If you are unable to perform the calibration checks yourself, consider sending your torque wrench to a professional calibration service.
- They will use specialized equipment and procedures to ensure the most accurate calibration.
7. Calibration Frequency
- The frequency of calibration depends on the usage and accuracy requirements of the torque wrench.
- As a general guideline, it is recommended to calibrate the wrench every 6-12 months or after any significant impact or damage.
Wrapping Up
By following these steps, you can ensure that your torque wrench is accurately calibrated and delivering precise torque measurements. This will not only prevent costly errors and equipment failures but also ensure the safety and reliability of your equipment. Remember, a well-calibrated torque wrench is a tool you can trust to get the job done right.
Frequently Discussed Topics
Q: What is the tolerance for a torque wrench calibration?
A: The tolerance varies depending on the wrench’s accuracy class. Typically, it is around ±2-5% of the wrench’s full-scale range.
Q: Can I calibrate a torque wrench myself?
A: While some torque wrenches can be calibrated using simple methods, it is generally recommended to have them calibrated by a professional for the most accurate results.
Q: How can I prevent my torque wrench from losing calibration?
A: Proper storage and handling are essential. Avoid dropping or overtightening the wrench. Store it in a dry, temperature-controlled environment.
