End Mills & Slot Drills
 

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TECHNICAL DETAILS
  
  • Milling Cutters are normally supplied for RH Cutting and Tool Type N.
  • Intermediate diameters if ordered, shall be supplied with the same dimensions as the next bigger diameter.
  • Non-standard or special cutters are manufactured against specific orders.
  • Bore of milling cutters is usually supplied with H7 tolerance and the shank tolerance as specified in the BIS/ISO.
  • Cutters with taper shank are normally supplied with Morse Taper according to IS: 1715 - Dimensions for Self Holding Tapers
  • Dimensions for parallel shanks shall be according to IS: 8692 - Dimensions for Parallel Shanks for Milling Cutters.
  • Other general requirements are maintained according to IS: 1830 - Technical supply conditions for Milling Cutters.
    Hardness :
    Cutting portion : 760 HV to 900 HV.
    Shank portion :
    Parallel Shank : 240 HV to maximum hardness equal to cutting portion
    Morse Taper Shank :
    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

From 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
  • 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.
  • Milling Cutters according to DIN, BIS and ANS are also manufactured against specific requirement.
CUTTING SPEEDS (m/min)
Material

Plain Milling cutter

Shell
end mill

Side
milling cutter

End mill
Unalloyed steel up to 70 kg/mm2 25-35 25-35 25-35 25-35
Steel up to 90 kg/mm2 20-30 20-30 20-30 20-30
Cast Iron, Alloy steel up to 100 kg/mm2 15-25 15-25 15-25 15-25
Copper, brass, red brass 40-60 40-60 40-60 40-60
Cast bronze, bronze 30-50 30-50 30-50 30-50
Aluminum Long Chipped 250-300 300-400 300-400 300-400
Tough aluminium alloys, Aluminum cast alloys, Magnesium alloys 200-300 250-350 200-250 250-350
Age-hardened aluminium alloys, Brittle aluminium alloys 150-200 200-250 150-200 200-250
 
FEEDS PER TOOTH (mm)
Material

Plain Milling cutter

Shell
end mill

Side
milling cutter

End mill
Unalloyed steel up to 70 kg/mm2 0.2 0.25 0.07 0.05
Steel up to 90 kg/mm2 0.1 0.15 0.06 0.03
Alloy steel up to 100 kg/mm2 0.08 0.1 0.05 0.02
Copper, brass, red brass 0.2 0.25 0.08 0.05
Bronze 0.15 0.2 0.06 0.04
Aluminum long chipped 0.15 0.2 0.07 0.05
Tough aluminium alloys, Aluminium cast alloys, Magnesium alloys 0.1 0.15 0.06 0.04
Age-hardened aluminium alloys, Brittle aluminium alloys 0.05 0.08 0.05 0.0

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