The spare parts is in treatment process, as a result of the machine tool - clamping apparatus - error of geometry of existence of cutting tool system, and appear in treatment suffer force to be out of shape, heat is out of shape, vibration and wear away wait for an influence, make be machined the geometrical element of the spare parts produces an error inevitably. These errors include error of dimension deviation, appearance (include macroscopical geometry error, wave to spend with exterior surface roughness) reach position error. Public errand of appearance of appearance public errand is to show what the appearance place of onefold and real essential factor allows is fluctuant total volume. Appearance public errand brings expression with appearance public errand. Belt of appearance public errand includes tolerancepublic errand to take the 4 essential factor such as appearance, direction, position and size. Project of appearance public errand has: Linearity, flatness, circularity, cylinder is spent, line outline is spent, face outline is spent wait for 6. Public errand of position of positional public errand is to point to the position of associated and real essential factor to change to what fiducial place allows total volume. Directional public errand is directional tolerancepublic errand is to show associated and real essential factor is right fiducial what allow on direction is fluctuant total volume. This kind of public errand includes parallelism, verticality, gradient 3. Public errand of fixed position of fixed position public errand is associated and real essential factor total to the changing that allows on buy of fiducial v/arc be on the throne volume. This kind of public errand includes coaxial to spend, symmetry, position spends 3. Jumpy public errand beats tolerancepublic errand is with detecting specificly means is given according to tolerancepublic errand project. Jumpy public errand can be divided beat for the circle with completely jumpy. The form of the spare parts tolerancepublic errand in all 14, among them appearance public errand 6, positional public errand 8, rank issues a list. Classified project symbol is brief linearity of linearity of descriptive appearance public errand is the linear element that represents a spare parts to go up the state that actual figure carries ideal and linear. The flat rate that says normally namely. Linearity public errand is real wire allow to ideal and linear place most upheaval quantity. Go up in the design namely place is given, in order to limits the fluctuant scope that machining error place allows real wire. Flatness flatness is the planar element that represents a part actual figure, carry the state of ideal plane. The level off rate that says normally namely. Flatness public errand is actual surface allow to planar place most upheaval quantity. Go up in the design namely given, in order to limits the fluctuant scope that place of actual surface machining error allows. Circularity circularity is the element that represents the circle on the spare parts actual figure, with its the center keeps equidistant circumstance. The circle that says normally namely makes pitch. Circularity public errand is to be in same and sectional go up, what actual circle allows to ideal circle most upheaval quantity. Namely on the design given, in order to limits the fluctuant scope that the machining error place of actual circle allows. Cylinder spends cylinder is to express the cylinder on the spare parts on face appearance outline each bits, to its axes carries equidistant state. Cylinder spends tolerancepublic errand is actual cylinder face place of ideal and columnar face to allow most upheaval is measured. Namely on the design given, in order to limits the fluctuant scope that place of machining error of actual round cylinder allows. Line outline spends line outline is to express to be in of the spare parts give plane to go up, the curve of aleatoric appearance, carry the state of its ideal appearance. Line outline spends tolerancepublic errand is the real profile line that points to the curve that be not a circle to allow variation. Namely on the design given, in order to limits the fluctuant scope that place of real curve machining error allows. Face outline spends face outline is the curved surface that represents the aleatoric form on the spare parts, carry the state of its ideal appearance. Face outline spends tolerancepublic errand is the real profile line that points to the curved surface that be not a circle, the permission to ideal outline face variation. Namely on the design given, in order to limits the fluctuant scope of machining error of actual curved surface. Classified project symbol is brief descriptive position public errand is directional parallelism parallelism is to express to be measured on the spare parts real essential factor is opposite at fiducial the state that carries equidistance. The keeps parallel rate that says normally namely. Parallelism public errand is: The real direction of the element that be measured, what allow between as parallel as fiducial photograph good way most upheaval quantity. What give out on the design namely, limitation of in order to is measured the fluctuant range that place of direction of parallel of deviate of real essential factor permits. Verticality verticality is to express to be measured on the spare parts element is opposite at fiducial element, carry state of correct 90 ° included angle. Orthogonal rate carries between the two essential factor that say normally namely. Verticality public errand is: The real direction of the element that be measured, between perpendicular to fiducial photograph good way, what allow most upheaval quantity. Give out on the design namely, limitation of in order to is measured deviate of real essential factor is perpendicular direction, what allow most upheaval limits. Gradient gradient is to state on the spare parts two element carry the correct state that gives point of view arbitrarily relative to direction. Gradient public errand is: The real direction of the element that be measured, to fiducial what allow between the good way that gives point of view into random most upheaval quantity. Symmetry of fixed position symmetry is to state element of on the spare parts two symmetrical centers holds the position inside same center plane. Symmetry public errand is: The symmetrical median plane of real essential factor (or central line, axes) the variation that planar to ideal semmetry place allows. This ideal and symmetrical plane is to point to as planar as fiducial semmetry (or central line, axes) common ideal is planar. Coaxial spends coaxial is to express to be measured on the spare parts axes is opposite at fiducial axes, carry the state that going up point-blank together. The coaxal rate that says normally namely. Coaxial spends tolerancepublic errand is: Be measured the variation that actual axes photograph allows to fiducial axes place. Give out on the design namely, limitation of in order to is measured the fluctuant range that the good place place that actual axes deviate fixes by fiducial axes place permits. The position spends the position is the element such as the drop that shows a spare parts to go up, line, face, relative to the accurate state of its ideal position. The position spends tolerancepublic errand is: The real position photograph of the element that be measured allows to good place place most upheaval quantity. Jumpy circle beats the circle beats is to express the hodometer face on the spare parts to measure a range in definitive inside, carry the state of fixed position at fiducial axes relatively. Round jumpy public errand is: Be measured real essential factor circles fiducial axes, when rotating mobily whole round one without axial, range is measured in definitive inside, what allow most upheaval quantity. Beat beating completely is to show the spare parts circles fiducial axes to make completely when rotating continuously, the edge is whole be measured apparently jumpy quantity. Completely jumpy public errand is: Be measured real essential factor circles the whirl with fiducial successive axes, at the same time indicator when along its ideal outline moves relatively, allows the largest jumpy amount. CNC Milling