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Milling is the process of cutting away ( machining ) material by feeding a work-piece past a rotating multiple tooth cutter. The machined surface may be flat, angular or curved and the surface can be milled to many shapes dependent on the shank-type or bore-type cutters. The machine for holding the work-piece, rotating the cutter and feeding is called the milling machine.
Milling Cutter Information by The Tap & Die Co :
Milling Cutter Shank Diameters: They come in 3 different shank-types:
a) Threaded shank: The shank has a ‘threaded-end’ and all diameters have Whitform 20tpi (threads per inch)
b) Flatted shank: The shank does NOT have a threaded-end. It does have a ‘flatted-section’ on the shank
c) Plain shank: The shank does not have a ‘threaded-end’ and nor does it have a ‘flatted-section’ on the shankK
FORMULA
The speeds shown are given in surface feet per minute (ft/min) or surface meters per minute (m/min), measured at the periphery of the drill. To calculate thedrill revolutions per minute (RPM) from the surface speeds, the following formulae should be used, where D=diameter of drill
SFM = RPM x DIAMETER x 0.262
RPM = (SFM x 3.82) divided by DIAMETER
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CUTTING SPEEDS FOR HSS END MILLS & SLOT DRILLS
The following feeds are recommended to be used in conjunction with the tables on the preceding pages, but these may need to be varied according to the local conditions of the job in hand. Insufficient feed will lead to excess wear at the lips and corners of the drill; too great a feed may cause the chisel edge to wear or the drill to break. In the case of work-hardening materials it is very important that the feed employed is both sufficient and positive. Power feed is advised.
|
Material Type |
Grade |
Hardness |
Tensile Str |
Peripheral Speed Range | ||
|
HB |
N/mm(squared) |
meters/min |
feet/min | |||
|
Carbon Steel |
Free cutting |
150 |
510 |
30 - 40 |
100 - 130 | |
|
Carbon Steel |
0.3 - 0.4% carbon |
170 |
580 |
24 - 32 |
80 - 105 | |
|
Carbon Steel |
0.3 - 0.4% carbon |
248 |
830 |
18 - 25 |
60 - 82 | |
|
Carbon Steel |
0.4 - 0.7% carbon |
206 |
675 |
24 - 32 |
80 - 105 | |
|
Carbon Steel |
0.4 - 0.7% carbon |
286 |
970 |
16 - 25 |
52 - 82 | |
|
Alloy Steel |
- |
248 |
833 |
16 - 30 |
52 - 100 | |
|
Alloy Steel |
- |
330 |
1137 |
12 - 18 |
40 - 60 | |
|
Alloy Steel |
- |
381 |
1265 |
9 - 15 |
30 - 50 | |
|
Stainless Steel |
Martensitic: Free Cutting |
248 |
833 |
10 - 20 |
32 - 65 | |
|
Stainless Steel |
Martensitic: Std Grade |
248 |
833 |
5 - 10 |
15 - 32 | |
|
Stainless Steel |
Austenitic: Free Cutting |
As supplied |
As supplied |
10 - 20 |
32 - 65 | |
|
Stainless Steel |
Austenitic: Std Grade |
As supplied |
As supplied |
5 - 10 |
16 - 32 | |
|
Nimonic Alloys |
Wrought |
300 |
1030 |
4 - 8 |
13 - 26 | |
|
Nimonic Alloys |
Cast |
350 |
1200 |
4 - 8 |
13 - 26 | |
|
Titanium |
Commercially Pure |
170 |
510 |
7 - 12 |
23 - 40 | |
|
Titanium |
Commercially Pure |
200 |
660 |
7 - 12 |
23 - 40 | |
|
Titanium |
Commercially Pure |
275 |
970 |
7 - 12 |
23 - 40 | |
|
Titanium |
Alloyed |
340 |
1170 |
7 - 12 |
23 - 40 | |
|
Titanium |
Alloyed |
350 |
1200 |
7 - 12 |
23 - 40 | |
|
Titanium |
Alloyed |
380 |
1265 |
7 - 12 |
23 - 40 | |
|
Tool Steels |
HSS Std Grade |
225 |
735 |
10 - 20 |
32 - 65 | |
|
Tool Steels |
HSS Cobalt Grade |
250 |
830 |
10 - 16 |
32 - 65 | |
|
Tool Steels |
Hot Work Steel |
250 |
830 |
10 - 16 |
32 - 65 | |
|
Tool Steels |
Cold Work Steel |
250 |
830 |
10 - 16 |
32 - 65 | |
|
Cast Iron |
Grey, Malleable |
240 |
800 |
16 - 20 |
52 - 65 | |
|
Cast Iron |
Hardened |
330 |
1137 |
12 - 16 |
40 - 52 | |
|
Aluminium Alloys |
Wrought |
55 |
- |
200 - 1500 |
650 - 5000 | |
|
Aluminium Alloys |
Wrought |
110 |
- |
200 - 250 |
330 - 820 | |
|
Aluminium Alloys |
Cast |
100 |
- |
40 - 100 |
130 - 330 | |
|
Copper Alloys |
Brass: Free Cutting |
As supplied |
As supplied |
40 - 70 |
130 - 230 | |
|
Copper Alloys |
Brass: Low Leaded |
As supplied |
As supplied |
50 - 80 |
160 - 260 | |
|
Copper Alloys |
Bronze: Silicon |
As supplied |
As supplied |
40 - 70 |
130 - 230 | |
|
Copper Alloys |
Bronze: Manganese |
As supplied |
As supplied |
25 - 45 |
82 - 150 | |
|
Copper Alloys |
Bronze: Alluminium |
As supplied |
As supplied |
15 - 253 |
50 - 82 | |
|
Copper Alloys |
Bronze: Phosphor |
As supplied |
As supplied |
15 - 25 |
50 - 82 | |
|
Copper Alloys |
Copper |
As supplied |
As supplied |
40 - 70 |
130 - 230 | |
|
Plastics |
- |
- |
As supplied |
50 - 200 |
160 - 650 | |
The Tap and Die Company website has a lot of other very useful 'Technical’ Data & Information for you to view
