GB/T 20958.1-2007Test conditions for CNC bed-type milling machines - Testing of the accuracy - Part 1: Milling machines with horizontal spindle (English PDF)

3.1 Units of measurement

This section all linear dimensions are expressed in millimeters; angle deviation is mainly represented by the ratio. In some cases for clarity, but also with a micro

Radians or angular seconds. Its conversion relationship formula below.

0.010/1000 = 10µrad~2 "

3.2 Installation level

This section should be used with reference to GB/T 17421.1-1998, especially empty machine test before installation, spindles and other moving parts

Heating operation, testing methods and tools recommended accuracy.

For cross slide table type milling machines, the moving parts are placed in the middle position of travel, place a level in the center of the table; to stand

Column portable and mobile ram type milling machines, put on a deck along the rail bed, the bridge board perpendicular to the rail bed to put a foot, several level

Instrument separately on the deck Peace feet. Levels in both vertical and horizontal readings should not exceed 0.030/1000.

3.3 Test order

Inspection order under this Part may not represent the actual test sequence. In order to make an inspection tool assembly and disassembly and inspection of convenience, can be arbitrary

Order of inspection.

3.4 Test Project

When the test machine, according to the structural characteristics must not test all of the items in this section.

When the requirements for acceptance testing purposes, the user can obtain the manufacturer agreed to choose some interesting test items, but these test items

Head must be clearly stated at the time of ordering the machine.