State Primary Standard of Length Unit for Parameters of Involute Surfaces and Angle of Inclination of Tooth Line
Reproduction and maintenance of length unit for evolvment surfaces and tilt angle of tooth trace. Transferring of length unit for evolvment surfaces and tilt angle of tooth trace to the secondary standard by means of the comparison with the help of measures and to the working standards of the 1st class by means of the method of direct measurements in accordance with DSTU 3955-2000 (GOST 8.181-2000) “Metrology. National verification scheme for measuring instruments of the parameters of evolvment surfaces and tilt angle of tooth trace”.
Metrological characteristics | ||
Range | from 37 mm to 150 mm | |
for the radius of the main circles involute with angles of reamin from 0° to 35° | for the angle of inclination of the tooth line at its width from 10 mm to 160 mm | |
Uncertainty by type A (uA) | 0,25 μm | 0,25 μm |
Uncertainty by type B (uB) | 0,079 μm | 0,26 μm |
Total standard uncertainty (uC) | 0,26 μm | 0,36 μm |
Extended uncertainty (U) | 0,5 μm | 0,7 μm |