will remove twice as much from diameter() for example if the crossfeed screw is turned in .020 and a cut is taken the diameter will have been reduced by .040 sometimes only the compound is calibrated in this way many lathes however are graduated on the micometer dial to compensate for double depth on cylindrical turning on this type of lathe if the crossfeed screw is turned in unit .020 shows on the dial and a cut is taken the diameter will have been reduced .020 the tool would have actually moved into the work only .010 this is sometime called radius and diameter reduction