Optical curve grinders are used to precisely grind complex surfaces such as straight lines, arcs, and curves. By using light refraction to reflect the shape of the processing curve, they can accurately machine high-precision parts like grooves, inner and outer radii, and complex-shaped turning tools. During grinding, the workpiece and grinding wheel are magnified 20 to 50 times via an optical system and projected onto a screen. Operators can continuously monitor the grinding wheel against the magnified workpiece image and further enlarge it with a visual amplifier. This allows real-time observation and manual adjustment of the process to compensate for factors like wheel wear, material differences, or feed rate changes, ensuring the machined surface matches the sample image. After processing, the workpiece can be inspected via projection, providing clear and intuitive quality verification without needing additional checks.