| The fixture
holds the part during measurement. It is usually
made of granite and provided with grooves or threads for locating components
for positioning and securing parts. There are no
special requirements concerning the flatness of the fixture, since the
precision of the measurement is not determined by their flatness but by the
straightness of the guideways in the axes of the
coordinate measuring machine. The machine base
of a coordinate measuring machine carries, in addition to the work holding
fixture, all fixed and mobile components that allow the coordinate values to
be measured in three dimensions (the only exception are coordinate measuring
machines in the gantry style,
which have a machine base separate from the work holding fixture). |
Work holding fixture from UPMC, Zeiss |
