THE GRANITE V-BLOCK CHIEFLY CONTAINS PYROXENE, PLAGIOCLASE, OLIVINE, BIOTITE AND MAGNETITE. IT IS BLACK IN APPEARANCE, PRECISE IN STRUCTURE.
Specification | Parallel of working surface | Parallel of v-slot towards bottom | Parallel of V-slot towards side | Symmetry of V-slot towards two sides | Symmetry of V-slot’s side towards bottom | Verticality of V-slot’s side towards bottom | Height difference of a pair of V-blocks towards bottom | |||||||
Precision grade | ||||||||||||||
0 | 1 | 0 | 1 | 0 | 1 | 0 | 1 | 0 | 1 | 0 | 1 | 0 | 1 | |
63x63x90° | 1.5 | 3 | 4 | 8 | 4 | 8 | 8 | 16 | 8 | 8 | 4 | 8 | 5 | 10 |
100x100x90° | 2 | 4 | 4 | 8 | 4 | 8 | 8 | 16 | 8 | 8 | 4 | 8 | 5 | 10 |
160x160x90° | 205 | 5 | 5 | 10 | 5 | 10 | 10 | 20 | 10 | 10 | 5 | 10 | 6 | 12 |