Inspection square box Press JB / T3411.56-99 standards for manufacturing, material hardness HT200, with a cross above for precision parts inspection or draw lines at any angle for measurement and engraved tag holder is widely used in parts of parallelism When vertical degree of inspection and marking support the workpiece, usually the same side of the cube or cuboid, can produce a variety of specifications and high-side boxes and rectangular tube according to user requirements.
Test square box features
1. Purpose: test square box is mainly used for parallelism, verticality and other parts of the test and crossed square box test is a specific six cube face of the cavity made of cast iron, which has a work surface. V-groove test square box test of the environmental conditions: ambient temperature, and humidity.
2. Requirements: Face each test square box can not have rust, other defects scratches, cracks, dents and the impact of non-face measurement of performance should be painted sand, edge chamfering proper signage square box inside wall. and marked with the size, level serial number, manufacturer name.
3. Accuracy: scrape developed flat square box in addition to test-givers, but also with the contact spot color test is coated on the side length of the square of any number of spots within 25mm is for: 1, 2 less than 25 points; 3 less than 20 points.
4. Verify square box test method for the side length of 300mm and below the square box, square box when the test subject is at both ends of the surface of each block is placed amount of 1mm, the knife-edge ruler on the amount of block work surface, then in its Each office is indecent amount of block test plug both ends of the size difference between the amount of the block size of the equivalent block group just for being indecent when squeezed deviation between the two ends. This test should also face the longitudinal side box carry out horizontal and diagonal direction several sections. In each position error direction of the line measured coincides whichever maximum, whichever is the difference between the maximum positive difference in the absolute maximum negative and when the error is inconsistent direction , for the subject surface plane flatness. Our standard square box will be divided into six plates, namely 00,000,123, respectively, this precision generally corresponds to the provisions of GB1184-80 flatness tolerance of 123, a total of six grades.