Introduction to granite meter 

 Granite precision measuring tools, high-quality "Jinan Qing" natural granite material by machining, manual refinements made. Black gloss precision, structure, texture, uniformity, stability, high strength, high hardness. And has: high precision, no rust, acid and alkali is not magnetized, the same type, good wear resistance, etc.. In heavy duty and general temperature remains stable. 

 Granite platform is made of natural stone materials, precision reference measurement tools, instrumentation, precision tools, machine parts inspection, is the ideal plane, especially for high-precision measurements. Granite based on the underground quality of the rock layer, after millions of years of natural aging, the shape is very stable, do not worry deformed due to the conventional temperature difference. By rigorous physical testing and selection of granite materials, fine crystalline texture. The granite of non-metallic material, no magnetic response, and no plastic deformation. Its high hardness, and therefore to maintain good accuracy. Rock tools in use heavy objects bump up out a few grains of stone ballast. Its better than the precision measurement of high-quality cast iron and steel production base parts, to obtain high and stable accuracy. Such as my company's 1000 x 630mm the '00 'level granite slab, set aside a year to maintain the original accuracy of the same. 

 Granite platform and gauge stone features and advantages: 

 A rock by a long-term natural aging, the organizational structure is even a very small linear expansion coefficient, internal stress completely disappeared, no deformation, so the accuracy is high. 

 Second, good rigidity, high hardness, abrasion resistance. 

 Third, not afraid of acid, alkaline liquid material erosion, will not rust, do not need oiling, easy to stick dust, maintenance, easy maintenance, long service life. 

 Will not scratch, not a constant temperature to prevent temperature measurement accuracy can be maintained at room temperature. 

 Not magnetized, measurements can move smoothly, without Zhise sense, free from damp impact, the plane weighed. 

 I was the Secretary. Specializing in the production and sales of granite measuring, flat, flat fixing frame, rectangular device, V-block, parallel to the regulation, a ruler, flat feet, cubic feet, square box and other products. 

 Marble slab, granite platform technology parameters 

 Granite precision measuring tools, instruments and platforms, quality Jinan Green stone machined and made of hand-grinding. Shiny black, structural precision, uniform texture, good stability, high strength, high hardness, in heavy-duty and under the general temperature to maintain high accuracy, and does not rust, acid and alkali, abrasion resistance, not magnetized, the same type and so on. Measurement tools for mechanical plant. 

 ★ granite physical properties: 

 Proportion :2970-3070kg / m3 

 Compressive strength :245-254N / mm2 

 The elastic grinding :1.27-1 .47N/mm2 

 Coefficient of linear expansion: 4.6 × 10-6 / ℃ 

 Water absorption: 0.13% 

 Shaw strength: more than Hs70 

 The ★ granite slab accuracy with reference to the advanced countries standard flatness tolerance according to: 

 JB/T7975-1999 standard 

 000 = 1 × (1 +) um 

 00 = 2 × (1 +) um 

 0 = 4 × (1 +) um 

 A = 8 × (1 +) um 

 (D is the diagonal mm) 

 (Measurement of temperature is generally 20 ± 2 ° C)