Roundness measuring device
AssigneeMitutoyo Corporation
InventorYoshiyuki Omori
Life of this patent
Estimating the term…
Abstract
A roundness measuring device includes an annular ring, and a plurality of displacement sensors (comparative length measuring devices) provided on the ring at predetermined intervals. The displacement sensors are arranged such that lines along which measurement axes of the displacement sensors extend intersect at a single point.
Claims14
A roundness measuring device comprising:
- a circular band;
- and
- a plurality of displacement sensors provided on the band at predetermined intervals,
- wherein the plurality of displacement sensors is arranged such that a respective line along which a measurement axis of each displacement sensor of the plurality of displacement sensors extends, intersects at a single point.
A cylindricity measuring device comprising:
- a plurality of the roundness measuring sensors stacked on top of each other in a vertical direction, each roundness measuring sensor of the plurality of the roundness measuring sensors comprising:
- a circular band;
- and
- a plurality of displacement sensors provided on the band at predetermined intervals,
- wherein the plurality of displacement sensors is arranged such that a respective line along which a measurement axis of each displacement sensor of the plurality of displacement sensors extends, intersects at a single point.
A roundness measuring method using a roundness measuring device having an annular ring, and a plurality of displacement sensors provided on the ring at predetermined intervals, wherein the plurality of displacement sensors is arranged such that a respective line along which a measurement axis of each displacement sensor of the plurality of displacement sensors extends, intersects at a single point, the method comprising:
- setting the displacement sensors to zero with a master that is a perfect circle and serves as a reference;
- measuring, by the displacement sensors, a measurable object;
- calculating, as eccentricity, offset between a position of the master during calibration and a position of the measured object during the measurement;
- and
- subtracting the eccentricity obtained in the eccentricity calculating from measured values of the displacement sensors obtained in the measuring, and calculating offset of the measured object from a perfect circle.
Dependencies are inferred from the claim text.