vdoc

Chapter 10: D. Surface Plate Tools and Techniques 91
12.70 ± 0.13 mm
(.500 ± .005 in.)
0.13 mm
(.005 in.)
Test indicator must not
vary more than .005 in. full
indicator movement (FIM)
over entire surface
Gage blocks
(equal height in
three places)
Part II.D.2
Figure 10.3 An application of dial indicators for inspecting flatness by placing the workpiece on
gage blocks and checking full indicator movement (FIM).
Reprinted with permission of the Society of Manufacturing Engineers, Manufacturing Processes and
Materials, 4th edition, copyright 2000.
Dial indicators are used for many kinds of measuring and gauging operations.
One example is that of inspecting a workpiece, as illustrated in Figure 10.3.
They also serve to check machines and tools, alignments, and cutter runout. Dial
indicators are often incorporated in special gages in measuring instruments, as
exemplified by the indicating micrometer in Figure 7.8, page 65.
Vernier Height Gage
The vernier height gage is similar to a vernier caliper except that the fixed jaw has
been replaced by a fixed base, and the sliding jaw may have a scriber attached to it
for layout work, or a dial indicator for measuring or comparing operations.
Vernier height gages are presented in Chapter 7.
2. ANGLE MEASUREMENT INSTRUMENTS
Identify and use tools such as protractors,
sine bars, angle blocks, etc., in various
situations. (Application)
Body of Knowledge II.D.2