What Is an Index Plunger?
An index plunger is a mechanical component used for precisely fixing or positioning a workpiece. It features a pin that inserts into a hole or groove to securely lock the workpiece in place and can be easily released or detached via a knob.
Uses of Index Plungers
These plungers are used for positioning, indexing, and adjusting slides in various industries, including machine tools, packaging machinery, and food machinery. They are particularly effective in positioning workpieces on stages or tables where precise alignment is required.
Principle of Index Plungers
Index plungers operate by manually inserting and removing a pin at their tip. The knob controls the pin’s depth, allowing for quick engagement or disengagement. Most models feature a built-in spring for easy positioning, and some come with locks to secure the pin in a sunken position.
Types of Index Plungers
Index plungers come in various designs, including:
- Ring Type: Uses a tilting ring for operation.
- T-Shape Knob Type: Known for ease of use and grip.
- Without T-Knob Type: Adaptable for automation with levers or air cylinders.
- Special Knob Type: Operated by turning a knob.
- Compact Type: Suitable for limited spaces.
- Flange Type: Ideal for mounting on equipment walls.
- Button Type: Operates via a push button.
- Lever Type: Uses a lever for pin insertion/removal.
- Pin Removable Type: Allows for easy pin replacement or modification.
- Push Type: The pin retracts on pushing and stores inside when released.
How to Select an Index Plunger
When selecting an index plunger, consider the pin tip shape (spherical or tapered), the type of operation (return or rest position), and the pin tip’s shape for ease of positioning. Additionally, ensure the shear load of the pin can support the perpendicular load if used for load-bearing applications.
Structure of Index Plungers
Index plungers typically have a spring-assisted pin that moves in the direction of the knob operation—retracting when the knob is pulled and extending when pushed. This design allows for quick and efficient positioning or releasing of the workpiece.