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
Type of Cutter	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.