How to use the preset torque wrench correctly?

How to use the preset torque wrench:
1. Choose a torque wrench with a suitable range
In the use of preset torque wrenches, first select a moderate-range torque wrench according to the requirements of the measuring workpiece. The measured torque value should not be less than 20% of the torque device in use. Reinforcement of torque components, small-range torque devices can not be used over-range;

2. Determine the preset torque value according to the required torque value of the workpiece.
When the torque value is preset, pull down the locking ring on the handle of the wrench and turn the handle at the same time to adjust the value of the main scale line and differential scale line of the scale to the required torque value. After adjustment, loosen the locking ring and the handle will be automatically locked.

3. Confirm that the torque wrench and the fixed part are connected reliably and locked
When using a torque wrench, first connect the square tenon of the wrench to auxiliary accessories (such as sockets and various batch nozzles) to ensure that the connection is no problem. Before tightening the torque, set the force value that needs to be strengthened, lock the locking device, adjust the direction switch to the direction of force, and then operate 5-6 times in rapid succession during use to make the internal components of the wrench on The special lubricant can be fully lubricated, making the torque wrench more accurate and durable.

4. Method of adding force to torque wrench
Install a sleeve of the corresponding specification on the square tenon of the wrench, and cover the fastener, and then slowly apply force on the handle. When applying external force, it must be in the direction of the indicated arrow.
The hand should grasp the effective range of the handle, and apply the force slowly along the direction perpendicular to the shell of the torque wrench until the torque wrench makes a "tower" sound, and when it is tightened to the signal "click" (The preset torque value has been reached), stop afterburner. One job is completed.
At this time, the torque wrench has reached the preset torque value, and the work piece has been applied. Then the force should be released in time to avoid damage to other parts.
In the process of applying force, in accordance with the national standard instrument operating specifications, the deviation of the verticality should not exceed 10 degrees. The vertical deviation of the horizontal direction should not exceed 3 degrees, and the operator should ensure that the range of force applied up, down, left, and right does not exceed 15 degrees during use.

5. When using large-size torque wrenches, a long sleeve rod can be added to save effort.

6. The measurement result will be affected by the deviation in the horizontal and vertical directions. During the measurement, a vertical downward stable force value should be applied to the force control end, and then a little force should be added, so that the used value is more accurate.

7. The wrench is a measuring tool and should be handled with care. It cannot be used as a substitute for hammering. When not in use, please set the torque to the minimum value and store it in a dry place. The torque range is relatively wide, and it is relatively simple to reinforce the torque. You only need to set the required torque value to operate.

8. If it is not used for a long time, adjust the scale line back to the minimum torque value. It helps to ensure the accuracy of the torque.
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