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a/ Comprises cutting a part that has already been drilled and
bored to obtain a spacer or washer,
b/ Use a cutting tool. Bring the tool tip to the same height as
the axis (again using shims) or a little below the part centre,
c/ Start the machine after first setting the rpm,
1000 x V
N =
π x D
d/ Offset your tool to the left (wheel 17) using a straight edge to check the distance
between the part face and the right hand side of your tool. Stop as soon as you obtain
the desired distance and add 1 mm to it to correct the face surface.
e/ Manually and regularly advance the tool using wheel 14. We recommend lubricating
(with soluble oil and water) using a brush. As soon as the tool drills through into the
bore, reverse and disengage to the right
Designation: Threads are designated by the M symbol, followed by their diameter and
pitch in mm, separated by a multiplication sign. Example: M 30 x 3.5, i.e. M 30 for a 30
diameter thread with a 3.5 mm thread pitch. Standard threads are:
nominal Diameter M
M 3
M 4
M 5
M 6
M 8
M 10
M 12
M 14
M 16
M 18
M 20
M 22
M 24
M 27
M 30
/ Outer thread: The tool profile sharpening angle for cutting a metric thread is 60°, The
tool profile sharpening angle for cutting a Whitworth thread (English pitch) is 55°,
114135-Manual-D-EN.indd 19
CUTTING
OUTER AND INNER THREAD CUTTING
Typical pitch P (mm)
0,6
0,7
The tools are aimed and their profiles sharpened to 60°
0,8
1
1,25
1,50
1,75
2
2
2,5
2,5
2,5
3
3
3,5
© FAR GROUP EUROPE
CUTTING A TRIANGULAR THREAD
Tool penetration
- Normal penetration (see Fig. below).
or 55° using angle centre gages.
Outer
threading
tool
Tool height position. Absolutely aligned with the tip
axes (part axis).
Cutting tool
Outer threa-
ding tool
21/03/12 10:44:59
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