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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