Milling Cutters Shank + Bore type
Milling Cutter Information
Information on Milling Cutters shank types and Cutting Speeds for milling cutters
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 :

 Shank type cutters:- (right hand cutting)

a] Endmills used for profile milling/finishing but not sinking (end teeth are not over-centre cutting) - Produces openend slots or pockets (where plunge feed-in is not required) - End Mills Straight Screwed Shank Inch sizes to BSS122 Part 4 - Right hand cutting  - Plain or flatted shank in DIN also in stock

b] Slot drills 2-flute used for milling, drilling, sinking straight down into material and is flat bottomed. Used for side and end cutting, for key-seating, milling of closed slots by means of 'plunge' feed-in. Made to BSS122 Part 4 - Right hand cutting  - Plain or flatted shank in DIN are also in stock

c] Ball Nose Slot drills 2-flute used for milling slots with a rounded radius bottom, drilling, sinking straight down into material and makes round bottomed slots. Used for side and end cutting, for key-seating, milling of closed slots with rounded bottom by means of 'plunge' feed-in. Made to BSS122 Part 4

d] T-Slot Cutters with staggered teeth for cutting T Slots in machine tables. Cutters made in sizes to allow clearance for a range of bolt sizes. Used for opening out the top and bottom of a previously milled slot to form a T shaped slot. Used for side and face cutting,  Made to BSS122

e] Corner Rounding Radius Milling Cutters with straight teeth. Used for milling convex corner radii upto a quarter of a circle on components.  Made to BSS122

f] Dovetail Cutters with straight flute. Used for milling dovetail slideways in machine tool tables, jigs making 45, 55 and 60 degree angles. Cutting on angle + face. Made to BSS122

g] Inverted Dovetail Cutters with straight flute. Used for milling inverted dovetail slideways in machine tool tables, jigs making 45 and 60 degree angle from the opposite section. Cutting on angle + face. Made to BSS122

h] Woodruff Keyseating Cutters with alternate right and left hand angled teeth, with straight flute. Used for milling seatings in shafts for woodruff-keyways and for producing slots for Woodruff Keys by sinking in on the diameter of a shaft to a pre-determined depth and are made in sizes to accomodate Woodruff Keyways. Groove cutting only on the end teeth, not on the sides. Made to + DIN 6888 P9 

 Bore-type cutters:- (right hand)

a] Cylindrical Cutters or Plain Mills or Slab Mills with Right hand spiral of 30-35 degree. Used for general purpose metal removal providing a fair surface finish. They do not have the capacity to cut on the sides and used to machine surfaces narrower than the face of the cutter. Made to BSS122 for inch and DIN 884N for metric

b] Involute Gear Cutters machine form-relieved for Generating Teeth of Straight Gears - Modular MM Metric and BS Cutters - 8 cutters make a full set of gears - All with 20 degree pressure angle (PA)

c] Single Angle Cutters in Righthand (lefthand also available - ask). Cutters with one flat side and one angular side to teeth. Righthand cuts clockwise as viewed from angular side. Used for milling dovetails, serrations, angular slots or chamfers. Made to DIN 1823A for metric sizes

d] Equal Angle Cutters or Double Equal Angle Mills with two equal angular sides. Used for cutting Vee shaped slots, dovetails, serrations, angular slots or chamfers. Made to BSS122 for inch and DIN 1847 for metric

e] Convex Cutters fully  form relieved. Used for producing concave form on components and for milling concave half circles. They retain their original profile on regrinding.  Made to BSS122 for inch and DIN 856 for metric

f] Concave Cutters fully  form relieved. Used for producing convex form on components and for milling convex half circles. They retain their original profile on regrinding.  Made to BSS122 for inch and DIN 856 for metric

g] Side and Face Straight tooth Slot Cutters cut not only along the face of the cutter but on both sides of the teeth. Can easily be reground. (Staggered tooth cutters can also be supplied - ask) -  Used for side and face milling, for cutting slots + straddle milling.  Made to BSS122 for inch and DIN 885 for metric


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