QD12-35-B Coning Of Table Axis

The rotary table on test is placed on a rigid and flat support surface with the rotary axis in the vertical position. A precision sphere/hemi-sphere is placed and centred on the rotary axis at table top level and a high-resolution linear indicator is placed on the support surface close to the rotary table so that radial deviation measured at the apex of the sphere can be recorded over a minimum of two full revolutions of the table (RRa).

The process is then repeated with the precision sphere/hemi-sphere placed and centred on the spacer at a known height (h) with the radial deviations measured at the apex of the sphere recorded over a minimum of two full revolutions of the table (RRb).