PRECISION MEASURING AND GAGING - OD1642 - LESSON 1/TASK 2
indicator is used with the surface gage to check the trueness or alignment
of an object or workpiece.
The surface gage consists of a base with an
adjustable spindle (1) to which may be clamped a scriber or an indicator
Surface gages are made in several sizes and are classified by the
length of the spindle. The smallest spindle is 4 inches long, the average 9
to 12 inches, and the largest 18 inches.
The scriber is fastened to the
spindle with a clamp.
The bottom and the front end of the base of the
surface gage have deep V-grooves.
The grooves allow the gage to measure
from a cylindrical surface. The base has two gage pins (3). They are used
against the edge of a surface plate or a slot to prevent movement or