Determine
the effective lenght of cutting
edge (la) required, The approach
angle (k) and the depht of cuf (ap)
should be taken into consideration.
Ia = effective cutting
lenght
I = lenght of the cutting edge
The
smallest length of cutting edge (la)
required can be found in the table
to the right.
Approach
angle
k
Depth
of cut(ap)
1
2
3
4
5
6
7
8
9
10
15
Required
effective cutting edge lenght
(la)mm
90
105
75
120
60
135
45
150
30
165
15
1
2
3
4
5
6
7
8
9
10
15
1.1
2.1
3.1
4.1
5.2
6.2
7.3
8.3
9.3
11
16
1.2
2.3
3.5
4.7
5.8
7
8.2
9.3
11
12
18
1.4
2.9
4.3
5.7
7.1
8.5
10
12
13
15
22
2
4
6
8
10
12
14
16
18
20
30
4
8
12
16
20
24
27
31
35
39
58
The
effective length of the cutting
The point angle of an indexable insert
has a great influence on the stability
of the cutting edges, Every indexable
insert has a maximum effective cutting
edge lenght. The maximum values given
in the table are designed for working
safety when rough cutting with a continuous
cut.
If the effective lenght of the cutting
edge is lower than the depht of cut,
a larger indexable insert should be
used or the depht of cut should be
reduced.
For additional safety during difficult
cutting jobs, a larger or thicker
indexable insert should be used. When
turning against a shoulder, the depht
of cut can be increased considerably.
So
that no problems arise here, a larger
indexable insert should be used or
an additional face turning operation
should be performed.
Tools
and Indexible Inserts for TURNING 
