WQ-CLGC-6 type "tolerances" showcases an overview "tolerances" showcase is an important technical requirements on the design drawings of mechanical parts is an important part of the static and dynamic mechanical products geometric precision. With the development of science and technology and raise production levels of geometric precision mechanical products also made increasing demands, the geometric accuracy has formed an independent technical disciplines, and by academia and engineering sector has knowledge scholar's attention. Showcase Dimensions: 1200 × 400 × 1850m two, showcase details within the serial number and name of the showcase model for the contents of the first cabinet: measuring tools used with depth vernier caliper; height vernier caliper; micrometer diameter; depth vernier caliper; depth micrometer; outside calipers ; caliper; plug; Level; feeler. 2nd cabinet: straight straightness and flatness (a given direction) 3; straightness (2 for orientation on) in one direction; straightness (two directions perpendicular to each other); straightness (in any direction) 2; flatness 2; flatness error Criterion (a) three highs and one low; (2) two highs and two lows; (3) two highs and one low; straightness error discrimination method (given in the plane); straightness error discrimination law (in a given direction); straightness error discrimination law (in any direction) 3; 3 cabinet: roundness and cylindricity and roundness of profile 2; cylindricity; line profile of the two; roundness error of judgment Reform; least squares center; minimum circumscribed circle center 2; maximum inscribed circle center 2; roundness minimum tolerance zone; 4 cabinet: surface contour degree of parallelism and verticality of the surface contour; (a) a direction parallel to the degree of a face to face; the opposite parallelism (1) a b-line direction; (1) a line parallel to the direction of the c face; parallelism (1) a direction d line to line 2; parallelism (2) in two directions perpendicular to each other; parallelism in an arbitrary direction; a direction perpendicular to a face-degree; the degree of a vertical line across the direction b; c face the vertical direction of a line ; vertical degrees in one direction d line to line 2; verticality (2) two directions perpendicular to each other; verticality in any direction (across the line); vertical error discrimination law. 5 Cabinet: tilt and inclination concentricity given direction to a face to face; the inclination in the given direction b face line; tilt in the given direction c line to line 3; inclination in any On the opposite direction lines; coaxial 3. 6 cabinet: Symmetry Symmetry position and beat a face to face; b symmetry across two lines; symmetry of the face line; symmetry line to line; the location of the position of the 1:00 of the two; the position of the two lines the position of the two; the position of the two in any direction 2; the position of the plane; the location of the complex; runout a radial runout 2; oblique runout 2.