Tc 9-524 fundamentals of machine tools

Accessibility to Work
Because the universal head spindle may be operated in
either direction and mounted on either side of the basic unit,
threads may be milled at either end of the work and very close
to shoulders and flanges.
Helix Angles
The graduations on the basic unit faceplate and the
mounting plate of the universal head are used to set the
approximate helix angle. Refer to the Versa-Mil operator’s
manual for helix angles of different threads.
Thread Milling Cutters
Cutters as small as 2 3/4-inches in diameter may be used
with the universal head for external thread milling. The cutter
diameter for internal threads is governed by the internal
diameter of the work. Standard 60° included angle cutters may
be modified for use for American Standard Threads by
grinding a flat on the point. The width of the flat equals 1/8
the thread pitch and must have relief clearance the same as
other cutting tools.
9-21

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TC 9-524
APPENDIX A
TABLES
A-1

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TC 9-524
A-2

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TC 9-524
A-3

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TC 9-524
A-4

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TC 9-524
A-5

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TC 9-524
A-6

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TC 9-524
A-7

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