As a case study of vertical shaft spring grinder, this paper analyses the process of spring end grinding and establishes geometric model of spring face grinding, then calculates the formula of grinding force by the formula of surface grinding machine with vertical spindle and rotary table. Meanwhile, the paper also analyses the relation of grinding feed and depth, and applies controlled-force grinding to spring end grinding. In order to guarantee the grinding force with a fixed value, the grinding feed will be changed with the grinding depth. Considering the spring as an elastomeric, the wheel’s feed is composed of grinding feed and compensating feed when the spring end is grinded. Keywords-Spring End Grinding Machine; Spring; Face Grinding; Grinding Force; Feed