The marble drilling and tapping mechanism is a rock measuring tool made of "Jinan green" stone material through mechanical processing and manual precision grinding. Black luster, precise structure, uniform texture, good stability, high strength, high hardness, able to maintain high precision under heavy loads and general temperatures, and has advantages such as non rusting, non magnetization, and invariance.

The main mineral components of the marble drilling mechanism components are pyroxene, plagioclase, a small amount of olivine, biotite, and trace amounts of magnetite. They have a black luster, precise structure, and have undergone billions of years of aging, with uniform texture, good stability, high strength, and high hardness. They can maintain high precision under heavy loads. Used for industrial production and laboratory measurement work.

The precision of marble components refers to a standard, and the flatness tolerance follows the GB4987-85 standard

Level 000=1 × (1+d/1000) um Level 00=2 × (1+d/1000) um

Level 0=4 × (1+d/1000) um Level 1=8 × (1+d/1000) um

(d is diagonal mm) (Temperature measurement is generally at 20 ± 2 ℃)

Physical performance:

Specific gravity: 2970-3070kg/㎡

Compressive strength: 245-254N/m ²

Linear expansion coefficient: 4.61 × 10-6/℃

Water absorption rate:<0.13%

Shore hardness: above Hs70

Drilling mechanism components and marble drilling mechanism components have advantages such as high precision, no rust, no magnetization, no deformation, and good quality. Granite slabs can maintain stability under heavy loads and general temperatures. The granite flat precision measuring tool is made of granite flat material processed by machinery and finely ground by hand.