WORK REST DEVICE AND METHOD OF CONTROLLING THE DEVICE

PROBLEM TO BE SOLVED: To provide a work rest device enabling highly accurate grinding by movably following up the supporting position of shoes on the outer peripheral surface of the machined portions of a work according to variations in outside diameter dimensions of the machined portions, and a method of controlling the device. SOLUTION: This work rest device comprises the shoes 30a and 31a for supporting the machined portions Wa to We of the work W when the outer peripheral surface of the work W is ground while rotating the long work W about the axis L thereof in the state of supporting the work at both ends. The support positions P1 and P2 of the shoes 30a and 31a on the machined portions Wa to We of the work W are controllably changed in the radial direction of the machined portions Wa to We by a control device 41 based on the variation amounts o1 and o2 of the outer peripheral surfaces of the machined portions Wa to We according to a rotating angle between the machined point P0 of the work W and the support positions P1 and P2 of the shoes 30a and 31a.