Also known as surface roughness roughness, grinding spindle finish instrument, surface roughness tester, roughness tester, roughness tester, roughness tester, and other names, the first overseas R & D and later introduced the country. When the roughness of the surface roughness measurement, the sensor on the measured surface of the workpiece, driven by the drive mechanism inside the instrument sensors do constant glide along the surface to be measured, the sensor through the built-in stylus feel sharp measured surface roughness degrees, then the measured surface roughness of the workpiece caused by a displacement of the stylus, the amount of displacement of the inductance of the sensor coil changes the inductance, the measured surface roughness to generate an analog signal proportional to the output of the phase-sensitive rectifier, after the signal is amplified and level conversion into the data acquisition system.
Precision bearings according to ISO grading standards are divided into: P0, P6, P5, P4, P2. Rank higher in turn, where P0 is the general accuracy, other grades are precision level. Of course, different classification standards, different types of bearings, their classification method somewhat different, but the meaning is to the. The use of performance requirements of precision bearings rotating body with high runout accuracy, high-speed rotation and small changes in friction and friction.
没有评论:
发表评论