Install lever type dial gauge on watch lever, end with bedspring head knife handle or get collet knife handle abstruse maintain watch staff and installation is on main shaft. Above all, the whirl that dial gauge of demarcate lever type expresses a head radius. Make the same score ring gauge put on workbench of numerical control machine tool to be secured. Main shaft of machine tool of mobile numerical control arrives near the center of ring gauge, move and adjust Yuan Tou of lever type dial gauge to make its contact surface of ring gauge inside. Turn repeatedly with the hand main shaft, adjust dial gauge of crooked lever type to express the position of the head, till no matter main shaft rotates,arrive what angle, watch head all can the inside of ring gauge of bring into contact with and the directive that express a needle is 0. Because the radius of standard ring gauge is affirmatory already, right now so the watch head of lever type dial gauge rotates the radius R that radius is standard ring gauge. After the demarcate that finish, can measure a part with lever type dial gauge wide or groove is wide. Measure a spare parts to be in width of X axis direction, its move is as follows: 1) averages the part put on workbench of numerical control machine tool to be secured, two parallel ranges that the spare parts is measured must perpendicular at X axis direction. 2) dial gauge of mobile lever type arrives the left side of the spare parts, shake with the hand next pulse generator (electronic handwheel) make dial gauge expresses a head to be close to a spare parts to make its contact spare parts opposite side slowly. 3) uses hand roll main shaft, make express a head to rotate the opposite side of the biggest point contact of radius, make express a needle to indicate null. 4) stops main shaft of machine tool of mobile numerical control, the X axis coordinate that system of the numerical control below the record shows is numeric (if the opposite coordinate of numerical control system shows can the word of to clear, the X number of axle in also can showing opposite coordinate is worth to clear) . Main shaft of machine tool of 5) mobile numerical control, go to shift of lever type dial gauge on the right side of the spare parts near the face, make dial gauge expresses a head to be close to a spare parts to make its contact a spare parts slowly next on the right side of the surface. 6) uses hand roll main shaft, make express a head to rotate the right side of the biggest point contact of radius, make the directive that express a needle arrives 0 (like opposite side measurement technique) . 7) stops main shaft of machine tool of mobile numerical control, the X axis coordinate that records next numerical control systems to show again is numeric. Subtract right lateral X again to numerical value to X of numeric and subtractive left lateral of lever type dial gauge rotate the diameter is numeric, its absolute value is the accurate width of the spare parts. If system of previous numerical control is relative the X axis coordinate that coordinate shows is numeric already to clear, so the numerical value of X axis coordinate that right now numerical control system indicates is subtractive of lever type dial gauge rotate the actual width that diametical numerical value is a spare parts. Measuring when groove is wide, the X value that is worth subtractive and left side besides right side X and outside measuring wide... beyond appearance, different is the whirl that should add lever type dial gauge diameter. Inside and outside measures just in time contrary. Use such method to also can measure the diameter of aperture or columnar diameter. Dial gauge of type of lever of demarcate of the inconvenience in if be in,be being produced actually, usable and prejudicial type seeks an edge implement replace lever type dial gauge to undertake metrical to the spare parts. The measurement technique of measurement technique of numerical control machine tool and lever type dial gauge is similar, just not be in power first demarcate, because prejudicial type seeks an edge implement the diameter is foregone. Numerical control machine tool is additional, seek an edge with prejudicial type implement measure a spare parts to get factitious factor the influence is largish, meeting somebody is an error. CNC Milling