How do you cut radius on a engine lathe?

To cut a radius on an engine lathe, first, set up a tool bit with a rounded profile or use a radius tool holder. Position the workpiece securely in the chuck and adjust the lathe to the desired speed. Then, move the carriage or cross-slide gradually while making shallow cuts to create the curve, ensuring to frequently check the radius with calipers or gauges to achieve the desired shape. Finally, finish with finer cuts for a smooth surface.