GB/T 25372-2010Metal-cutting machine tools - Accuracy grade (English PDF)

3.2

specific to each type of machine, it should be based on the absolute levels of precision, according to the relative grading is divided into three relative accuracy levels, respectively

Chinese phonetic letters P, M, G, said.

P --- Ordinary Level (pronounced "P" in the model number P omitted);

M --- Precision (pronounced "secret");

G --- precision (pronounced "high").

3.3

The type of machine according to the specific circumstances, to determine one, two or three relatively precision.

3.4

P-level precision machine tools, precision indicators should be with the existing relevant international standards or advanced foreign standards of technical level quite.

3.5

P-level precision cylindrical surface machining machine tools, precision machining to achieve its dimensional tolerances GB/T 1800.1-2009 provisions of IT6 to IT7 , Roundness, cylindrical reached GB/T 1184-1996 stipulated eight precision machining, general precision grade V response should be absolutely level (for example, lying

Lathe).

3.6

P-level precision machine tools flat, flatness, squareness if they can reach GB/T 1184-1996 predetermined level 6-7 shape and position

Tolerance machining accuracy, precision grade V general response should be absolutely level (for example, milling machine).

3.7

P-level precision tooth face machining, if they can reach GB/T 2363-1990 or GB/T 10095.1-2008 and

GB/T 10095.2-2008 provisions 6-7 gear tolerance machining accuracy, precision grade V general response should be absolutely level (for example, insert

Cutting Machine).

3.8

from grade to grade V VI, V grade to grade IV, IV grade to grade III, III grade to grade II, grade I to II level precision machine tools, precision standard work

Tolerance values accuracy of test items should be in accordance with the requirements of precision machining objects, to determine the absolute accuracy class machine work accuracy test project its neighboring

Tolerance value ratio.

GB/T 29001.5-2013 | GB/T 28615-2012 | GB/T 24343-2009 | GB/T 25375-2010 | GB/T 25374-2010 | GB/T 25373-2010 | […]