Wiktor Wise
Calibrating an electric torque wrench is essential to ensure accurate and reliable torque readings. Torque wrenches are precision tools that can measure the tension and twist of nuts and bolts, helping to tighten them securely without over-tightening. While some choose to send their wrenches to professional calibration labs, it is also possible to calibrate them at home. Calibration involves measuring the length from the square drive to the point where the hand rests, securing the wrench, aligning it with the settings, and attaching weights. Regular calibration is necessary to maintain accuracy, and factors such as temperature and impact can affect the calibration.
| Characteristics | Values |
|---|---|
| Calibration frequency | Regular calibration is required to maintain accuracy. Some professionals opt for a monthly calibration routine. |
| Calibration method | Digital torque wrenches have a hidden calibration menu, accessed by pressing a sequence of buttons. |
| Calibration tools | Torque wrench calibrator tools can cost between €1,000 and €10,000. Outsourcing calibration to a third-party service is an alternative option. |
| Calibration process | The wrench is attached to the calibrator tool, a predetermined amount of torque is applied, and the torque readings of both devices are compared. |
| Storage | Store the wrench in its case, in a low, climate-controlled area to avoid damage and calibration issues. |
| Usage | Only use the wrench for appropriate tasks within its upper and lower limits. |
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What You'll Learn
Calibration frequency
Calibration is essential to ensure that an electric torque wrench provides accurate results. The frequency of calibration depends on several factors, including the frequency, degree, and kind of usage. While there are no strict time periods that must be followed, professionals recommend calibrating a torque wrench after 2,500 repetitions. This is because the performance of the tool is believed to be affected between 2,500 and 3,000 repetitions.
Many professional users prefer a month-based calibration routine, calibrating their wrenches every month, regardless of usage. This ensures that any defects are detected early on. Calendar-based calibrations, such as every six months, are also popular fallbacks, although they may not keep the torque wrench in perfect working condition.
The need for calibration can also be determined by noticing certain signs. For example, if the torque reading seems off compared to when the wrench was purchased, or if the wrench feels less powerful than usual. Visual inspections can also help identify issues, such as loose screws, corrosion, or visible wear and tear.
Additionally, it is important to store and handle the torque wrench properly to avoid damage and maintain calibration. Torque wrenches are sensitive to impacts and temperature changes. They should be stored in a climate-controlled area, at a comfortable setting, with the temperature maintained between +18°C and +28°C. They should also be stored in their protective cases, separate from other tools, and at a low height to minimize damage if dropped.
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Storage
Proper storage is essential to keeping your electric torque wrench in good condition. Here are some detailed guidelines on how to store your electric torque wrench:
- Always store your electric torque wrench in a cool, dry place. Avoid locations with extreme temperatures, whether too hot or too cold, as these can affect the tool's accuracy and performance.
- Keep the wrench in an area with low humidity. High humidity can lead to corrosion and damage the tool over time.
- Store the wrench in its original case or protective casing. This helps maintain the calibration and protects it from external factors.
Winding and Torque Settings:
- If you use your electric torque wrench frequently, you don't need to worry about winding it back. Regular use helps keep the spring in good condition.
- For long-term storage, several weeks or more, wind the wrench down to the lowest scale setting. Reducing the torque setting relieves tension on the spring and prevents potential creep, set, or relaxation issues.
- Avoid winding the wrench to zero, as this can affect the calibration. The lowest non-zero setting is ideal for storage.
- For "clicker" or "click-type" torque wrenches, always store them at the lowest possible setting. Storing these wrenches at higher settings can cause main spring wear and failure over time.
Maintenance and Precautions:
- Inspect your wrench regularly for any signs of wear, corrosion, or damage. Look for worn or cracked sockets and lubricate any parts that appear dry or worn out.
- Follow the manufacturer's recommendations for maintenance and care. This includes guidelines on torque direction, lubrication, force, and tightening/release cycles.
- Avoid using handle extensions or any accessories not specified by the manufacturer. These can compromise the accuracy and safety of the tool.
- Consider storing a silica desiccant package inside the case to help maintain a dry environment.
- If you have multiple wrenches, calibrate them against each other periodically to ensure accuracy.
By following these storage guidelines, you can help ensure your electric torque wrench remains accurate, reliable, and in good working condition for an extended period.
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Temperature
When calibrating an electric torque wrench, the room temperature should be maintained between +18°C and +28°C. Throughout the calibration process, the temperature must remain stable, with deviations of no more than 1°C. This stability ensures accurate measurements and helps to maintain the calibration over time.
To achieve this, it is recommended to calibrate the wrench in a climate-controlled area, such as a workshop or laboratory, where temperature and humidity can be monitored and adjusted if necessary. This environment should also have minimal humidity, as high humidity can impact the wrench's performance and calibration retention.
Additionally, the torque wrench itself should be stored in a protective case, shielding it from extreme temperatures and humidity fluctuations. This case should be stored separately from other tools to avoid damage and kept in a cool, dry place.
By controlling the temperature and humidity during calibration and storage, you can help ensure the accuracy and longevity of your electric torque wrench's calibration.
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Comparison to a known standard
Calibration is necessary to ensure that a torque wrench provides accurate and reliable torque readings. This is because the strain on the internal spring can cause the calibration to drift if not left on zero. Torque wrenches are sensitive tools, and banging them around or dropping them can immediately affect their calibration.
To calibrate an electric torque wrench, you can compare it against a known standard. This involves using a highly accurate torque transducer at several test points. You can adjust the wrench by pressing a sequence of buttons to enter the calibration screen. Then, apply a load to the wrench while measuring the actual torque with your standard and input the reading into the wrench.
Digital torque wrenches may have a hidden calibration menu that can be accessed by pressing a specific sequence of buttons. This menu can be used to calibrate the wrench without the need for disassembly.
For professional and accurate calibration, it is recommended to seek the services of a specialized company, such as Encore Systems USA, which follows the ISO 17025 standard. This standard ensures the highest level of accuracy and reliability in calibration, and only a select few in the field of tool calibration have this accreditation.
It is important to note that attempting DIY torque wrench calibration is generally not advisable. Professional calibration services ensure accuracy and can help avoid problems caused by inaccurate calibrations, such as the wrench not delivering the required force.
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Calibration tools
Torque wrench calibrator tools can cost anywhere from EUR €1,000 to over EUR €10,000. The price varies depending on the tool's accuracy rate, maximum torque range, and additional features, such as the ability to connect with other electronic devices. Due to the high cost of these tools and their complexity, some users prefer to outsource their calibration to third-party calibrator services or professionals. Torque wrench calibrator tools are especially useful for calibrating digital torque wrenches, which require the help of an external tool for calibration.
To calibrate a torque wrench, you will need to attach it to the calibrator tool, apply a predetermined amount of torque in a certain frequency, and then compare the torque readings of both devices. The calibrator tool will serve as the benchmark for the accuracy of the torque wrench.
For a more cost-effective solution, you can also calibrate a torque wrench at home with some basic tools. Here are the steps:
- Measure the length from the square drive to the point of the torque wrench where your hand rests while using the tool.
- Secure the wrench by clamping the square drive in a vise, ensuring no other part of the wrench is locked in.
- Align the torque wrench to the value of the settings obtained in step one and multiply it by a weight (typically 20 pounds).
- Tie the weight with a thin rope to the wrench from the position where your hand rests, ensuring the wrench remains horizontal.
- If you hear a click, lift the weight and move it towards the head of the wrench until the clicking stops. If you don't hear a click, move the weight farther from the head and try again.
Remember that regular calibration is essential to ensure accurate results and that there are also professional services available if you have doubts about your ability to calibrate the tool yourself.
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Frequently asked questions
There is no set time frame for calibrating your torque wrench, but it is recommended that you do it regularly. The more frequently you calibrate, the sooner a defect can be detected.
If the torque reading of the wrench seems "off" compared to when it was recently purchased, or if your wrench has electric motors and feels "less powerful" than usual, it may be time to calibrate it. You can also visually inspect the wrench for damage, loose screws, corrosion, or any other signs of wear and tear.
First, measure the length from the square drive to the point where your hand rests while using the tool. Secure the wrench by placing the square drive in a vise. Align the torque wrench to the value of the settings you got in step one (the distance from the square drive to your hand) and multiply it by 20 pounds. Tie the 20-pound weight with a thin rope to the wrench from the position of your hand, keeping the wrench in a horizontal position. If you hear a click, lift the weight and move it towards the head of the wrench until the clicking stops. If you don't hear a click, move the weight farther from the head of the wrench and try again.
Yes, there are several precautions you can take to maintain the calibration of your electric torque wrench. Store your torque wrench in a safe place, preferably in its protective case and separate from other tools. Avoid dropping or banging the wrench, as this can affect its calibration. Use the wrench only for appropriate tasks that fall within its upper and lower limits. Finally, keep the wrench in a climate-controlled area, as big shifts in temperature or humidity can affect its calibration.
