Technical Specifications

MILLING CUTTERS

TECHNICAL SUPPLY CONDITIONS OF "DAGGER MILLING CUTTERS"
1. Milling cutters are normally supplied for RH cutting and Tool Type N.
2. Intermediate diameters, if ordered , shall be supplied with the same dimensions as the next larger standard size.
3. Non standard or special cutters are manufactured against specific orders.
4. Bore of milling cutters is usually supplied with H7 tolerance and the shark tolerance as specified in the BIS / ISO.
5. Cutters with Taper shank are normally supplied with Morse taper according to IS: 1715 - Dimensions of self holding Tapers.
5.1 Dimensions for parallel shanks shall be according to IS:8692 - Dimensions for parallel shanks for milling.
6. Other general requirements are maintained according to Is: 1830 - Technical supply conditions for milling cutters.

6.1 Hardness:-
Cutting Portion: 760 Hv to 900 HV
Shank Portion :
Parallel Shank: 240 Hv to equal to cutting portion
(in case of one- piece construction)
185 Hv to 450 Hv (In case of two piece construction)
Morse taper Shank: 185 Hv min (after construction)
Tang of Morse taper Shank: 300 Hv to 450 Hv

Radial and Axial run out

Type of Cutter Diameter range Permissible Radial and Axial run Out Testing Conditions
Over Upto and Including Form relieved Profile Sharpened  
Cutter with Bore -
50
120
50
120
250
0.07
0.10
0.12
0.05
0.07
0.10
Rotated on Stationary test arbor
Cutter with Shank -
50
50
120
0.07
0.10
0.05
0.07
Held between centres or shank rotated in a "V" - block

6.2 Radial and Axial run out
7. Recommendation for Tool Type selection of milling cutters: Tool Type N- for mild steel, malleable cast iron and medium hard non-ferrous metals.
Tool Type H- for specially hard and tough materials.
Tool Type S- for soft and ductile materials.

Basic Geometry for Machining Normal Materials- Carbon Steels & Cast Iron

Type of Tool Helix Angle Positive Rake Primary Clearance
Cylindrical milling cutter 30degree-35degree R.H. 8 degree-12 degree 7 degree- 9 degree
Side & Face milling cutter Straight teeth 6degree- 10degree 4degree- 6degree
Shell end mill 25degree - 30 degree R.H. 8degree-12 degree  
Equal angle milling cutter - 0degree 3degree- 5degree
Woodruff key slot milling cutter Straight teeth 3degree-5degree 3degree-5degree
Slot milling cutter with parallel Shank 15degree - 20degree R.H. 4degree - 6degree 2degree - 4degree
End mills with parallel shank 27degree - 33degree R.H. 9degree - 11degree R.H. 8degree - 12degree R.H.
End mills with Morse   9degree - 11degree R.H. 8degree -12degree R.H.
T-Slot milling cutter with Morse taper shank 12degree-18degree L.H. & R.H. Alternatively 6degree-10degree 4degree-6degree
e Taper Shank(Tapped end) 27degree - 33degree R.H.    

Recommended Cutting Fluids for HSS Milling Cutters.

Type of Material Recommendations
Hard Tool and Alloy Steel Soluble oil compound or neat cutting oil
Low Carbon Steel Soluble oil
Copper brass or bronze Soluble oil or dry
Aluminium and Aluminium alloys Soluble oil or neat cutting oil specially produced for light alloys.
Magnesium Dry or Compressed air
Cast iron Dry or Compressed air
Stainless Steel
Nimonic alloys
Soluble oil can be used but Sulphurised or Chlorinated mineral oil or fatty oil are most suitable.
Zinc base alloys
Mazak
Soluble oil

CUTTING SPEEDS(m / min)

Material Plain milling cutter Shell end mill Side milling cutter End mill Form relieved cutter
Unalloyed Steel up to 70 kg/mm 25-35 25-35 25-35 25-35 25-30
Steel upto 90 kg /mm 20-30 20-30 20-30 20-30 15-25
Cast iron, Alloy steel up to 100 kg/mm 15-25 15-25 15-25 15-25 12-20
Copper, Brass, Red brass 40-60 40-60 40-60 40-60 30-50
Cast bronze,bronze 30-50 30-50 30-50 30-50 25-40
Aluminium Long Chipped 250-300 300-400 300-400 300-400 300-400
Tough aluminum alloys, Aluminium cast alloys, Magnesium alloys 200-300 250-350 200-250 250-350 200-300
Age-hardened aluminium alloys,brittle aluminium alloys 150-200 200-250 150-200 200-250 150-200

FEEDS PER TOOTH(mm)

Material Plain milling cutter Shell end mill Side milling cutter End mill Form relieved cutter
Unalloyed Steel upto 70 kg/mm 0.2 0.25 0.07 0.05 0.04
Steel upto 90 kg/mm 0.1 0.15 0.06 0.03 0.03
Alloy steel upto 100 kg/mm 0.08 0.1 0.05 0.02 0.02
Copper,brass,red brass 0.2 0.25 0.08 0.05 0.04
Bronze 0.015 0.2 0.06 0.04 0.03
Aluminium Long chipped 0.15 0.2 0.07 0.05 0.04
Tough aluminium alloys
Aluminium cast alloys
Magnesium alloys
0.1 0.15 0.06 0.04 0.03
Age- hardenedaluminium alloys
brittle aluminium alloys
0.05 0.08 0.05 0.03 0.03

Recommendations for SELECTION OF MILLING CUTTERS (REF: IS 1830)

Material to be cut Tensile strength MN / m2 Brinell Hardness HB Tool type
Carbon steel upto 500   N or (S)
Above 500 upto 800   N
Above 800 upto 1000   N or (H)
Above 1000 upto 1300   H
Steel castings     H
Grey cast iron   UPto 180
over 180
N
H
Malleable cast iron     N
Copper Alloy Soft
Brittle
  S or (N)
N or(H)
Zinc alloy     S or (N)
Aluminium alloy Soft
Medium
Hard
  S
N or (S)
N or (S)
Aluminium alloy age hardened Low cutting speed
High cutting speed
  N
S
Magnesium alloy     S or (N)
Plastics Unlaminated
laminated
  N or (S)
S

Tool Type N- for mild steel, malleable cast iron and medium hard non-ferrous metals.
Tool Type H- for specially hard and tough materials.
Tool Type S- for soft and ductile materials.