The measurement of roundness and flatness with traditional methods, apart from particular cases, doesn't produce results comparable with those from a laboratory roundness measuring system (Talyrond or equivalent). In fact using the traditional procedure, with two transducers in differential position (a+b), roundness is given as the result of the max-min difference between the measured diametric variation. A roundness measuring system uses only one measuring head. It indicates the roundness as the radial difference between the inscribed circumference and the circumscribed one after nullifying the possible concentricity error. So, with the traditional method, plausible results can be obtained only on errors with an even number of lobes (oval, square, etc.), but not on errors with an odd number of lobes (triangle, pentagon, etc.). It's possible to use three transducers at 120° to measure triangolarity, but in this way the ovality is not correctly read and furthermore the measuring mechanics become complicated.

ITADISK, our special testing software, enables dimensional and geometrical inspection of several sections to be carried out in the production area with a measuring cycle time of just a few seconds. It also produces results comparable to those from roundness measuring systems in a metrology laboratory. This is possible because it uses the same measuring method:

One electronic contact transducer per section

Set number of values per section by end user (typically 4000)

Eccentricity evaluation and profile centering

Roundness evaluation on centered profile

Polar and linear graphics