German neidlein workpiece fixtures neidlein model neidlein price

neidlein workpiece fixtures are devices used on machine tools to clamp workpieces and guide cutting tools. They refer to fixtures specifically designed for a particular operation of a specific workpiece. Their characteristics include compact structure, rapid, convenient, and labor-saving operation, ensuring high machining accuracy and production efficiency. However, the design and manufacturing cycle is long, and manufacturing costs are high. When the product changes, the fixture will be scrapped because it can no longer be used. It is only suitable for production with fixed products and large batches. It contacts the positioning reference of the workpiece to determine the correct position of the workpiece in the fixture, thereby ensuring the correct relative position of the workpiece with respect to the cutting tool and the machine tool's machining motion during processing. It usually consists of positioning elements, clamping devices, tool-setting and guiding elements or devices, etc.

neidlein workpiece fixture operating principle

The most widely used grippers are pneumatic grippers; they are essentially cylinders powered by compressed air. When air is supplied, the gripper jaws approach and firmly grasp the object to enable other operations, and when the air direction is reversed, the gripper releases the object. Typical applications include changing the orientation of an object or moving it during pick-and-place operations. When a gripper holds a workpiece, there must be certain force constraints and form constraints to ensure that the clamped workpiece is fully released during movement, dwelling, and loading. In addition, it must ensure that the geometric deviation of the workpiece holding posture remains within the specified tolerance zone.

neidlein workpiece fixture features

Mechanical grippers commonly use compressed air as the power source, achieving finger movement through a transmission mechanism. According to the different motion trajectories of the fingers when clamping the workpiece, mechanical grippers are divided into: 1) Arc opening/closing type: driven by the transmission mechanism, the motion trajectory of the finger tips is an arc. This type of gripper has strict requirements on the dimensions of the clamped part of the workpiece; otherwise, it may cause abnormal workpiece status. 2) Arc parallel opening/closing type: the two fingers of this type of gripper perform parallel opening and closing movements during operation, while the motion trajectory of the finger tips is an arc. The illustrated gripper uses a parallelogram transmission mechanism to drive the parallel opening and closing of the fingers in two situations. 3) Linear parallel opening/closing type: the motion trajectories of the two fingers of this type of gripper are linear, and the clamping surfaces of the two fingers always remain parallel. A cam mechanism is used to achieve the parallel opening and closing of the two fingers. Inclined cam slots are opened on the sliding blocks of each finger. When the piston rod moves up and down, the rollers installed at its end move in the cam slots, achieving parallel clamping movement of the fingers. Using a rack and pinion mechanism, when the rack at the end of the piston rod drives the gear to rotate, the rack on the fingers performs linear motion, thereby causing the two fingers to open and close in parallel to clamp the workpiece.

neidlein workpiece fixture maintenance

1) Check before use whether the limit dimensions are still in the correct position. 2) If the stop pin wear exceeds tolerances, it can be repaired by grinding; if the baffle, pin, or positioning taper pin wear exceeds tolerances, they can be reassembled, shifting the worn areas to continue use. 3) Apply anti-rust oil after use. Regular long-term lubrication can maintain the life of synchronous fixtures; incorrect lubrication will lead to reduced clamping force, poor accuracy, wear, and jamming, so correct lubrication is essential. After machining, be sure to clean the body and slide ways of the synchronous fixture with an air gun or similar tool. When cleaning, remove the dust cover fixing screws and take off the dust cover, while extending the main jaws to the fully open position to easily clean chips accumulated inside the fixture. To avoid reduced clamping force due to rust, use anti-rust cutting oil. Remove the synchronous fixture every six months for a thorough cleaning (at least every two months when machining cast iron or copper parts). Check parts for damage or wear, and replace with new items immediately if severe. Lubricate thoroughly before assembly.

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