Study on Inspection of Entry-exit NC Machine Tools Based on Double-ball-bar

Geometry error of numerical controlled machine conveniently and quickly by use of double-ball-bar can be measured,and builds up the figure model of such errors based on the instruments mentioned above.

This paper research on the measurement for the main thermal errors of 3-axis machine tool with Double-Ball-Bar (DBB), such as spindle thermal drifts errors, the parallelism error between spindle and guide way of the Z-axis, the scaling mismatch errors and the cyclic errors of the ballscrew shaft.

Rapid Test of Errors of Key Structure Parameters of a PRS-XY Type Hybrid CNC Machine Tool Based on the Ballbar;

Errors identification and compensation for CNC machine tools based on the Renishaw ballbar;

Maintenance of K-4500 blood-cell counter;

The neutron spectra and the neutron dose equivalent rates inside and outside the containment of a power reactor were measured with two multi-sphere spectrometer systems that the central detectors are a spherical gold foil and a spherical3He proportional counter, respectively.

Two types of multi-sphere spectrometers, based on active and passive detectors respectively, were established by the Division of Radiation Metrology of China Institute of Atomic Energy for measuring the neutron energy spectra and dose equivalent rates in radiation workplaces.

Working Principle and Structure Design of the Direct-reading Spherometer;