Abstract: A portable turning tool for removing material from a worn component of a device such as a motor generator. The portable turning tool has a support member which is fixedly secured to the device in such a position so as to have a centrally located opening therein aligned with an opening formed in the support structure of the device. A rod having a cutter bit at one end and an actuator at the other end is passed through the pair of openings thereby positioning the cutter bit adjacent the worn component. By providing means on the support member for permitting the rod to slide but not rotate with respect thereto, sliding movement of the rod and thereby the cutter bit across the worn component while simultaneously rotating the component allows material to be removed from the component without disassembling the device during the turning operation.