PRECISION MEASURING AND GAGING - OD1642 - LESSON 1/TASK 2
FIGURE 8.
CUTTER CLEARANCE GAGE.
(10) Adjustable Parallel.
The adjustable parallel (figure 9 on the
following page) consists of two wedges connected on their inclined surfaces
by a sliding dovetail.
The distance between the two outside parallel
surfaces is varied by moving the mating parts together or apart.
The
distance is then measured with a micrometer. An adjustable parallel can be
locked at any height between the maximum and the minimum limits.
This
instrument, constructed to about the same accuracy of dimensions as parallel
blocks, is very useful in leveling and positioning setups in a milling
machine or in a shaper vise. Adjustable parallels are available in various
sizes depending on the nature of the work.
(11) Surface Gage. A surface gage (figure 10 on page 21) is used to
measure or gage an object and to indicate the parallelism of surfaces. It
is used primarily in layout and alignment of the work. The surface gage is
commonly used with a surface plate and a scriber to transfer dimensions and
layout lines to the work. In some cases, a dial
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