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Choose a matching screwdriver bit to ensure it can firmly grip the screw, reducing the possibility of slipping or deviation. Magnetic bits can also be used to help stabilize the screw and prevent it from tilting at the start of tightening.

II. Preparation Work

1. Screw Surface Treatment:
   Ensure the surface is clean and free of dust, grease, or other impurities, as these can affect the positioning and verticality of the screw.

2. Check the Hole:
   Make sure the threaded hole is clean and free of debris or obstructions, which could otherwise cause the screw to tilt.

3. Screw Positioning:

• Manual Pre-positioning: Manually align the screw with the threaded hole and gently rotate it a few turns to ensure it naturally aligns with the starting point of the thread.

• Visual Check for Verticality: Visually inspect whether the screw is perpendicular to the work surface. A level or vertical guide can be used to assist in this check.

III. Control the Operation Process

1. Slow Start:

• Begin tightening at a low speed to allow the screw to enter the hole steadily, reducing the risk of tilting.

2. Maintain Verticality:

• Visual Monitoring: Stay focused during tightening and observe the angle between the screw and the work surface to ensure it remains vertical.

• Adjust Angle: If the screw begins to tilt, stop tightening immediately, adjust the angle of the tightening gun, and then continue.

3. Multi-step Tightening:

• Tighten in steps, setting appropriate torque and speed for each step to avoid tilting caused by excessive torque or overly fast rotation.

IV. Use of Auxiliary Tools

Use a dedicated tightening gun arm to keep the gun in a vertical position, effectively preventing deviation.
Danikor’s tightening arm is anti-torque, labor-saving, and highly comfortable. It absorbs the reaction force during bolt tightening, supports torque up to 50Nm, and makes manual operation easier and more comfortable. It offers stable load, maintains end balance, and allows flexible load adjustment with instant stopping capability. The base is rigidly reinforced to ensure perpendicularity between the tool and the tightening surface, guaranteeing that the screw enters the hole vertically.

At the same time, it effectively eliminates the impact of reaction force on the operator, supports long-term operation under high torque, and provides a stable working environment for manual tightening stations.