CHESTER Cobra Mill, Инструкция по эксплуатации

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5.1. Spindle Speed
Spindle speed in revolution per minute (R.P.M.) for the cutter can be calculated from the equation :­
where ­­
N = R.P.M. of the cutter
CS = Linear Cutting Speed of the material in m/min. ( see table 1 )
d = Diameter of cutter in mm
5.2. Feed Rate
Feed rate (F) is defined as the rate of travel of the workpiece in mm/min. But most tool suppliers
recommend it as the movement per tooth of the cutter (f). Thus,
F = f . u . N
where ­­ F = table feed in mm/min
f = movement per tooth of cutter in mm ( see table 1 )
u = number of teeth of cutter
N = R.P.M. of the cutter
where
C.S. and feed rate for some common material :­
Tool Material High Speed Steel Carbide
Material
Cutting
Speed
Feed (f)
Cutting
Speed
Feed (f)
Mild Steel 25 0.08 100 0.15
Aluminium 100 0.15 500 0.3
Hardened Steel ­­­ ­­­ 50 0.1
Table 1