The document discusses various tools used for measurement and marking out in fitting practice, including steel rulers, vernier calipers, micrometers, dial caliper gauges, and limit gauges. It explains how to use each tool, read measurements, and check for dimensions being within specified limits.
28. VERNIER READING ACCURACY
length of n divisions
Scale 1
n -1
Accuracy = 1 - n
Vernier n -1 1
= n
n
length of (n - 1) divisions
29. VERNIER HEIGHT GAUGE
GRADUATED
SCALE – Used in connection
with a surface table
FINE fitted with a carbide
ADJUSTMENT tips for marking the
SCREW lines on the
VERNIER workpiece
SCALE
CARBIDE
TIPPED
SCRIBER
BASE