Shank Cutter Info, Speeds & Drill Feeds

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Shank Cutter Information:

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 thedrill. 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

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

Grade

Hardness

Tensile Str

Peripheral Speed Range

Type

N/mm²

^meters/min

feet/min

Carbon Steel

Free Cutting
0.3 - 0.4% carbon
0.3 - 0.4% Carbon
0.4 - 0.7% Carbon
0.4 - 0.7% Carbon

150
170
248
206
286

510
580
830
675
970

30 - 40
24 - 32
18 - 25
24 - 32
16 - 25

100 - 130
80 - 105
60 - 82
80 - 105
52 - 82

Alloy Steel

-
-
-

248
330
381

833
1137
1265

16 - 30
12 - 18
9 - 15

52 - 100
40 - 60
30 - 50

Stainless Steel

Martensitic: Free Cutting
Martensitic: Std Grade
Austenitic: Free Cutting
Austenitic: Std. Grade

248
248
As supplied
As supplied

833
833
As supplied
As supplied

10 - 20
5 - 10
10 - 20
5 - 10

32 - 65
15 - 32
32 - 65
16 - 32

Nimonic Alloys

Wrought
Cast

300
350

1030
1200

4 - 8
4 - 8

13 - 26
13 - 26

Titanium

Commercially Pure
Commercially Pure
Commercially Pure
Alloyed
Alloyed
Alloyed

170
200
275
340
350
380

510
660
970
1170
1200
1265

7 - 12
7 - 12
7 - 12
7 - 12
7 - 12
7 - 12

23 - 40
23 - 40
23 - 40
23 - 40
23 - 40
23 - 40

Tool Steels

HSS Std Grade
HSS Cobalt Grade
Hot Work Steel
Cold Work Steel

225
250
250
250

735
830
830
830

10 - 20
10 - 16
10 - 16
10 - 16

32 - 65
32 - 52
32 - 52
32 - 52

Cast Iron

Grey, Malleable
Hardened

240
330

800
1137

16 - 20
12 - 16

52 - 65
40 - 52

Aluminium Alloys

Wrought
Wrought
Cast

55
110
100

-
-
-

200 - 1500
200 - 250
40 - 100

650 - 5000
330 - 820
130 - 330

Copper Alloys

Brass: Free cutting
Brass: Low Leaded
Bronze: Silicon
Bronze: Manganese
Bronze: Alluminium
Bronze: Phosphor
Copper

As supplied
As supplied
As supplied
As supplied
As supplied
As supplied
As supplied

40 - 70
50 - 80
40 - 70
25 - 45
15 - 253
15 - 25
40 - 70

130 - 230
160 - 260
130 - 230
82 - 150
50 - 82
50 - 82
130 - 230

Plastics

As supplied

50 - 200

160 - 650

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