Lesson 4/Learning Event
Thread Cutting Tool
To check the correct form of a thread cutting tool, place the proper gage
over the tool, Figure 61. (The Acme standard gage is used here.) The tool
must mesh properly with no light showing between the tool and the gage. Use
a 29-degree angle as a guide when grinding a cutting tool.
When the tool fits the angle, grind the point to fit the proper place on the
gage. This indicates the number of threads per inch to be cut.
USING THREAD CUTTING TOOL GAGE
A double ended radius gage blade is used to check the inside corner or
fillet of a machine part, Figure 62, Part A. Each blade can be locked in
any position and at any angle for both inside and outside radii, Figure 62,
USING FILLET AND RADIUS GAGES