Cutter Speeds
As regards singie-lip milling cutters, it is recomended to use cutting speeds three times higher
than those used with standard type milling cutters. The data tabulated below should be used only
as a guide, as such factors as, drive conditions and available spindle speeds will also have to be
taken into consideraton. In end cutting edges the cutting speed will decrease towards the cutter
center line. This effect is particularly noticeable in rounded-off cutters, As a consequence, care
should be taken that stock is preferably removed by the outer portion of the cutting edge.
When cutting soft aluminium, use kerosene as a coolant. When cutting celluloid, the cutter must
alwaysbeinfeedmotion,inordertoavoidthematerialcatchingre.
Tool angles and recommended cutting speeds for single-lip cutters
Material to be cut a B T Recomended cutting Speeds for single lip
cutters of High Speed Steel
m/min
Grey cast iron 25° 15° 5° 60
Cast steel
Malleable cast iron
Machinery steel,
57,000 to 85,000 psi (40 to 60 kg/mm) 70
85000 to 115,000 psi 60
(60 to 80 kg/mm)
over 115,000 psi 40
(80 kg/mm)
Tool steel soft grade . 60
hard grade 50
Brass, 58/41 soft grade 200
hard grade 250
Brass, 63/37 soft grade 30° 15° 5° 120
hard grade 150
Bronze soft grade 260
hard grade 200
Aluminium soft grade 35° 200
hard grade 250
Wood 25° 15° 5°
35° 250
Plastic : Trolon 200
Pert inaz, Fiber 45° 25° 20° 200
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