Abstract: A cylindrical grinding machine comprising chucks for supporting and rotating a workpiece about a selected axis, a wheelhead assembly selectively displaceable transverse to the axis including a rotatable grinding wheel for effecting stock removal from the surface of the rotating workpiece, a workrest assembly including a jaw having a workpiece engaging shoe, and means for selectively displacing the jaw for opposing the deflective force exerted by the grinding wheel on the rotating workpiece as it is machined, and means for monitoring the wear of the jaw including an indicator gauge mounted on the workrest jaw including a visually observable needle, a control arm pivotally secured to the workrest jaw having a first workpiece engaging end and a second end operatively associated with the indicator gauge, the control arm having a first position whereat the control arm first end leads the workrest shoe and a second position whereat the control arm first end is flush with the workrest shoe, and a spring for biasing