Final answer:
An edge finder is used to precisely locate the edges of a workpiece during machining. There are various types including mechanical and electronic edge finders, with laser and optical edge finders providing advanced capabilities for precision.
Step-by-step explanation:
An edge finder is a tool used primarily in metalworking to locate the edges of a workpiece with high precision during machining processes. Its purpose is to ensure that the workpiece is positioned correctly in the machine tool. The correct answer to the student's question is B) Finding the edges of a workpiece; Laser edge finder, Optical edge finder.
There are several types of edge finders used in the lab, which include:
- A mechanical edge finder which typically consists of a precision rod that can be rotated in a machine spindle. When the rod touches the workpiece, it becomes slightly off-center, indicating the edge position.
- The electronic edge finder which often beeps or lights up when it detects the edge of the workpiece, providing a digital or visual indication.
The optical and laser edge finders are advanced versions offering greater accuracy and ease of use. They use a visual method such as a light beam to detect the edge.