What Are The Types Of Dowel Pins What are the dowel types and what are their functions? The function of dowel pins is mainly reflected in restricting the free movement of articles. As we all know, articles move up and down in space, XYZ three axial straight motion, and the function of dowel pins is to fix the position of articles.Get more news about dowel pin,you can vist our website! The dowel is the part involved in limiting these degrees of freedom. In a die consisting of two or more parts, a pin designed to position the two adjacent parts of the die accurately. On the spindle positioning, the first mechanical CAM mechanism photoelectric disk is coarse positioning, and then a hydraulic or pneumatic positioning pin is inserted into the pin hole or pin slot on the spindle to achieve accurate positioning. After the tool change, the positioning pin exits and the spindle begins to rotate. The main types are: 1. Fixed positioning pin; 2. Interchangeable positioning pin; 3. Cone positioning pin; 4. Trimming locating pin; 5. Standard diamond-shaped positioning pin; 6. Spring dowel.