Precision machining produces metallic parts with tight tolerances. However, precision components are sometimes produced with rough tolerances since parts have complex geometries. Because this may cause backlash or lower dimensional accuracy of parts, high tolerance should be fulfilled. This research finds errors from true position of holes made on a sloped surface of precision component. When holes are being produced, load requirements on a sloped surface are compared with ones on a normal plane. Statistical analyses are made through the analyzing data collected from the experiments. Applying the decision made this paper suggests how the machining conditions should be selected to low positional errors.