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| Toolbits |
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| Materials |
10%
T42 |
8% Cobalt
M42 |
5% Cobalt
M35 |
M2 |
| Mild Steel Wrought Iron, Soft Brass, Copper,
Bronze and Aluminium with tensile strength of less than
39.0 Kgs. per Square mm |
79 - 50 |
70 - 45 |
60 - 40 |
59 - 36 |
| Steel & Steel casting such as slightly
hard Mild Steel, Soft Cast Iron & Oterh Metals like
Hard Brass, Copper & Aluminium with tensile strength
upto 60.0 Kgs. per Square mm |
39 - 26 |
36 - 24 |
33 - 32 |
30 - 21 |
| Steel & Steel Castings such as carbon
steel, Medium hard Cast Iron & other metals like Hard
Brass, Copper & Aluminium with tensile strength upto
71.0 Kgs. per Square. mm |
29 - 21 |
26 - 18 |
24 - 16 |
22 - 15 |
| Steel & Steel Castings such as Oil Hardend
steel, Chrome Steel, Hard Cast iron, etc. with tensile
strength upto 79.0 Kgs. per Square mm |
22 - 16 |
21 - 15 |
20 - 14 |
18 - 23 |
| Steel & Steel castings including annealed
High Speed Steel, with Tensile Strength upto 102.0 Kgs.
per Square mm |
15 - 13 |
15 - 12 |
14 - 11 |
12 - 10 |
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| Surface Finish
micron |
Work Materials |
Range of Cutting
Speed m/min |
Nose Radius is mm |
| 0.5 |
1.0 |
2.0 |
| Feed in min/rev. |
| 10 |
Carbon Steel & Alloy
Steel
|
<50
>50 |
0.3-0.5
0.4-0.55 |
0.45-0.6
0.55-0.65 |
0.55 0.7
0.65-0.7 |
| Cast Iron Bronze & Aluminium
Alloys |
All Ranges |
0.2500.4 |
0.40-0.5 |
0.5-0.6 |
| 5 |
Carbon Steels and Alloy Steels |
<50
>50 |
0.18-0.25
0.25-0.3 |
0.25-0.3
0.3-0.35 |
0.3-0.4
0.35-0.5 |
| Cast Iron Bronze & Aluminium
Alloys |
All Ranges |
0.15-0.25 |
0.25-0.40 |
0.4-0.6 |
| 25 |
Carbon Steel and Alloy Steel |
<50
50-100
>100 |
0.10
0.11-0.16
0.16-0.2
|
0.11-0.15
0.16-0.25
0.2-0.25
|
0.15-0.22
0.25-0.35
0.25-0.35 |
| Cast iron Bronze & Aluminium
Alloys |
All Ranges |
0.1-0.15 |
0.15-0.2 |
0.2-0.35 |
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| OPERATION |
DEPTH OF CUT mm |
| Rough turning |
Depth of cut = machining
allowance |
| Semi finishing turning |
0.5 to 0.2 mm |
| Finish turning |
0.4 to 0.1 mm |
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