# When is a Dowel Pin Used? ## Step 1: Identify the Purpose of a Dowel Pin A dowel pin is typically used for precise alignment of two or more parts. It ensures that components fit together accurately by restricting relative movement, especially during assembly. **Explanation:** Dowel pins serve as locating devices, making sure holes or features in mating parts stay aligned. --- ## Step 2: Analyze the Drawing for Dowel Pin Usage From the drawing (not shown here), look for holes or features marked for dowel pins, usually indicated with specific symbols or notes. Dowel pins are placed in these locations to align and secure the parts together during assembly. **Explanation:** If the drawing shows holes labeled for dowel pins or includes a note specifying their use, this is where and when a dowel pin is used—to maintain alignment during assembly. --- ## Final Answer A dowel pin is used when precise alignment of parts is required, as indicated by the designated holes or notes in the drawing. It ensures accurate assembly and restricts movement between components.