Bench
micrometers
can substantially improve the precision of micrometer
measurements. Particularly when the objects to be measured are
small. The stable position of the instrument during the
measurements permits a more precise locating of the work and the
heavy base adds to the rigidity of the instrument. Bench
micrometers are usually equipped with both large-diameter spindles
and thimbles, permitting a finer pitch thread for higher
sensitivity, and direct reading in ten-thousandths , or
smaller.
Micrometer heads without a frame as an integral part have wide
applications in the instrument building field. One of the more
frequent uses is the controlled displacement of slides, either
single or cross slide . Commonly, the micrometer will move the
slide against a moderate spring pressure, which is applied to
assure a positive contact between the micrometer spindle face and
the contact point on the slide face. Springs exerting a uniform
force along the entire slide traverse are preferred.