Large granite platform

Application of large granite platform: the granite platform is suitable for various inspection work, the datum plane for precision measurement, the measurement datum for machine tool mechanical inspection, checking the dimensional accuracy or behavior deviation of parts, and marking. The large granite platform is also an excellent basic tool in mechanical manufacturing

what are the technical requirements for the use of large granite platforms

① if you want to set threaded holes (or grooves) on the surface of grade 0 and grade 1 granite platforms, its position should not be higher than the working face. (debugging by technicians)

② large granite platform should adopt fine-grained gabbro, diabase and granite with dense structure (biotite should be less than 5% and elastic modulus should be greater than 0.6 × 10-4kg/cm2, water absorption rate should be less than 0.25%), and the working surface hardness should be greater than 70hs

③ the large allowable value of surface roughness Ra of granite platform working surface is 0.32~0.63um, and the side is 10um

④. Flatness tolerance of granite platform working face

⑤. When the flatness of platform working face is checked by diagonal method or grid method, the fluctuation of gas plane and the fluctuation of working face shall be checked. (this is what the factory and operators must know)

appearance and surface quality requirements and verification methods of large granite platform

newly made marble plate, granite plate should be marked with the name of the manufacturer, accuracy level, specification and number. The working surface of large granite platform shall be uniform in color, free from cracks, depressions and loose tissue, and free from grinding marks, scratches, diseases and other defects that affect the accuracy of the marble plate. The word order of granite plate in use has the above defects that do not affect the accuracy

the accuracy verification method of large granite platform adopts electronic level meter and torsion spring comparator

large granite platform is suitable for the maintenance, marking and measurement of detailed workpieces; Maintenance and measurement of various machine tools and machinery; Check the dimensional accuracy and line position deviation of the parts, and make careful marking. Granite plates are used in industrial production and laboratory measurement