Threading Solutions - Vargus

X
Threading
Technical Data
Step by Step Thread Turning - Example 2
5-6ACME-3G
Application:
Thread: Internal Right Hand
ACME
Pitch: 6 tpi
Bore dia: 5”
Material: Stainless Steel Austemitic
1
Choose the Thread Turning Method (see page 121)
To facilitate the removal of chips from the machined
area, we chose a feed direction away from the chuck.
Therefore an internal left hand insert and an internal
left hand toolholder are to be used.
2
Choose the Insert Size (see page 59)
Y
L
IC
Chosen insert: 4IL6ACME
Insert Size Pitch Ordering Code
IC L inch tpi
RH
Anvil
LH
1/2” .87 6 4IL6ACME... YE4
Toolholder
AVR..-4(LH)
3
Choose the Toolholder (see page 104)
D1
F
L1
L
D
2°
A
Chosen toolholder: AVRC 150-4 LH
Insert Size
IC
Ordering Code
LH
1/2” AVRC 150 LH 1.34 12.0 2.50
Dimensions inch
Min Bore
A L L1 D D1 F inch
1.501.50.98 1.75
4
Determine the Helix Angle (see page 122)
0
1
2
3
4
5
6
7
8
9
10
11
12
Pitch [tpi]
Special
Toolholders
2” 4”
b = -2°
Pitch diameter [inch]
6” 8”
D b=0°
24
18
14
11
9
7
6
5
4.5
4
3.5
3
2.5
2.25
b=-1°
In this case, a right hand thread is being turned with
a left hand toolholder. The reverse helix method is
used. From the lower part of the table, using a pitch
of 6 tpi and a bore diameter of 5”, we obtain a helix
angle of -0.65°.
139