Opening/closing chuck and method of manufacturing fingers

A method of manufacturing a pair of fingers configured to slide inside of a guide groove of a body of an opening/closing chuck, and which are slidably supported in directions to approach toward and separate away from each other;

• wherein the fingers each include a pair of overhanging portions configured to project out laterally from a main body portion, and outer peripheral surfaces of the overhanging portions are made up from five surfaces including upper surfaces, side surfaces, lower surfaces, first end surfaces, and second end surfaces, wherein the upper and lower surfaces are perpendicular to the side surfaces;
• the method of manufacturing the fingers comprising a step of applying crowning at intersections of the five surfaces, by a combination of performing grinding with respect to the side surfaces by a first machining tool, and performing grinding with respect to the upper surfaces and the lower surfaces by a second machining tool.

A method of manufacturing fingers configured to slide inside of a guide groove of a body of an opening/closing chuck, and which are slidably supported in directions to approach toward and separate away from each other;

• wherein the fingers each include a pair of overhanging portions configured to project out laterally from a main body portion, outer peripheral surfaces of the overhanging portions are made up from five surfaces including upper surfaces, side surfaces, lower surfaces, first end surfaces, and second end surfaces, and the upper surfaces and the lower surfaces are tapered surfaces configured to come into closer proximity to each other toward the side surfaces;
• the method of manufacturing the fingers comprising a step of applying crowning at intersections of the five surfaces, by performing grinding with respect to the side surfaces and simultaneously performing grinding with respect to the upper surfaces and the lower surfaces, using a single machining tool.