Machining Fundamentals
78
measurement of shallow grooves, and small diame-
ter holes. They are adjusted to size by the knurled
knob at the end of the handle. Measurement is made
over the contacts with a micrometer, Figure 4-62.
TEST YOUR KNOWLEDGE
Please do not write in this text. Write your
answers on a separate sheet of paper.
1. Make readings from the rules.
Figure 4-61. Small hole gages are used to measure the
diameter of holes that are too small for telescoping gages.
Figure 4-62. The correct way to measure a small hole gage with
a micrometer.
2. Make readings from the Vernier scales shown
below.
B
A