FST tweezers(such as fine tipped forceps for biological dissection and anti-static forceps for microelectronics) rely on built-in springs to provide stable clamping force. Insufficient tension can cause clamping slip, while excessive tension can accelerate component wear. The calibration of its spring tension requires the establishment of quantitative standards, and the verification of its lifespan needs to simulate high-frequency usage scenarios to ensure that it meets precision operation requirements (such as no damage to biological sample clamping and no detachment of electronic component clamping).

1、 Spring tension calibration: precise quantification of clamping force

1. Preparation before calibration

Equipment and tools: digital tension meter (accuracy ± 0.01N, range 0-5N, compatible with FST forceps specifications), standard weight (10g/20g, used for auxiliary verification), forceps fixing fixture (to avoid forceps shaking during calibration);

Sample selection: Select 3 pairs of FST tweezers of the same model (such as Dumont # 5 fine tipped tweezers), wipe the spring and jaws with anhydrous ethanol to remove oil and impurities, and avoid affecting tension detection.

2. Calibration operation process

Tension benchmark setting: Refer to the FST manual to determine the target tension range (such as 0.3-0.5N for fine tipped tweezers and 0.5-0.8N for anti-static tweezers). If there is no clear value in the manual, use "holding 10g standard weight without slipping" as the initial benchmark (corresponding to a tension of ≈ 0.1N, which needs to be adjusted according to the usage scenario);

Tension meter measurement: Close the forceps jaws to 1/2 opening (simulating the actual clamping state), connect the ends of the two arms of the forceps with a tension meter hook, slowly open until the jaws are fully opened, and record the maximum reading of the tension meter (measure continuously for 3 times, take the average);

Tension adjustment: If the tension is lower than the lower limit (such as 0.2N), gently squeeze the spring plate with a special adjustment pliers (each adjustment amplitude ≤ 0.05N); If it is higher than the upper limit (such as 0.6N), slightly stretch the spring plate, adjust and re measure until the tension falls within the target range;

Verification: Hold the corresponding weight standard weight (such as 30-50g weight corresponding to 0.3-0.5N tension) with calibrated tweezers, suspend for 10 seconds without slipping, and the jaws have no obvious deformation, indicating that the calibration is qualified.

2、 Lifetime verification: simulated usage evaluation performance degradation

1. Verify the scenario and parameter settings

Simulated usage conditions: Referring to the actual usage frequency (such as 200 opening and closing times per day in the laboratory), set the total number of opening and closing times for life verification (5000 times for conventional use and 10000 times for high-frequency use scenarios);

Operating parameters: Simulate manual operation with a mechanical opening and closing device, set the opening and closing angle to 80% of the maximum opening of the tweezers (to avoid excessive stretching of the spring), with a dwell time of 1 second per opening and a 2-second interval, simulating continuous operation rhythm.

2. Staged performance testing

Initial testing: Record the spring tension, jaw parallelism (measured with a feeler gauge, gap ≤ 0.02mm), and clamping stability (no slipping of 0.1mm diameter gold wire clamped) before verification;

Mid term testing: After completing 2000 opening and closing cycles, stop the device and repeat the tension calibration steps. If the tension decays by more than 10% of the initial value (such as 0.4N at the beginning and decays to below 0.36N), record the decay rate; At the same time, check whether there are cracks in the spring plate and whether the clamp is deformed;

Endpoint determination: When any of the following situations occur, the lifespan is determined to be terminated: ① Tension attenuation exceeds the initial value by 20%; ② The gap between the jaws is greater than 0.05mm, making it difficult to stably grip the target workpiece; ③ Visible cracks appear on the spring plate;

Result record: Statistics of different modelsFST tweezersEstablish a lifespan database based on the average lifespan of 6000 for fine tipped tweezers and 8000 for anti-static tweezers.

3、 Daily maintenance and calibration cycle

1. Maintenance points

Wipe the spring and jaws with a soft cloth after each use to prevent chemical reagents (such as alcohol, acetone) from corroding the spring coating;

When storing, close the tweezers to 1/3 of the opening to avoid long-term tension fatigue of the spring. Place them in a dedicated tweezer box to prevent deformation due to compression;

Do not use tweezers to hold heavy objects with excessive travel (such as workpieces weighing more than 50g) to avoid damage to the spring due to overload.

2. Calibration cycle

High frequency use (>100 opening and closing times per day): calibrated once a month;

Regular use (<50 opening and closing times per day): Calibrate once every quarter;

After calibration, a calibration label should be affixed, indicating the calibration date, tension value, and calibrator to ensure traceability.

　　FST tweezersThe calibration of spring tension requires quantitative detection and precise adjustment to ensure clamping performance, and the verification of lifespan requires simulating actual scenarios to evaluate attenuation laws. Combined with daily maintenance, it can greatly extend the service life and provide stable tool support for precision scenarios such as biological experiments and microelectronic operations.