USE/CARE OF HANDTOOLS & MEASURING TOOLS - OD1621 - LESSON 3/TASK 1
(7) Thread Cutting Tool Gages.
These gages provide a standard for
thread cutting tools. They have an enclosed angle of 29 and include a 29
One gage furnishes the correct form for square threads and
the other for Acme standard threads.
These gages are used to check convex
and concave radii in corners or against shoulders.
This gage is used to check the accuracy of
drill cutting edges after grinding. It is also equipped with a 6 inch hook
rule. This tool can be used as a drill point gage, hook rule, plain rule,
and as a slide caliper for taking outside measurements.
(10) Marking Gages.
A marking gage is used to mark off guidelines
parallel to an edge, end, or surface of a piece of wood. It has a sharp
spur or pin that does the marking.
(11) Tension Gage.
This type of gage (not illustrated) is used to
check contact point pressure and brush spring tension in 1 ounce
This special gage (not illustrated)
checks the depth of saw teeth in thousandths of an inch from 0 to 0.075
b. Types of Thickness (Feeler) Gage. Thickness (feeler) gages are made
in many shapes and sizes; usually 2 to 26 blades are grouped into one tool
and graduated in thousandths of an inch.
Most thickness blades are
straight, others are bent at the end at 45 and 90 angles. Some thickness
gages are grouped so that there are several short and several long blades
together. Thickness gages are also available in single blades and in strip
form for specific measurements. For convenience, many groups of thickness
gages are equipped with a locking screw that locks the blade to be used in
the extended position. Figure 197 on the following page shows several types
of thickness gages supplied by the Army Ordnance Supply System.