Technical Guidance The Basics of Endmilling, Endmilling Edition
■ Parts
Body
Shank
Neck
Land width Flank width Margin width Margin
Head Diameter
Cutter sweep
Radial flank
Radial primary relief angle
Shank Dia.
O.D.
Radial secondary relief angle
Neck length Cutting Edge Length
Centre hole
Shank length
Overall Length
N
Centre Cut
With Centre Hole
Rake Face Rake Angle Groove
Helix Angle
End cutting edge Corner
Peripheral Blade
Land Land width
Heel
End gash
Rounded flute bottom Centre hole
Web thickness
Axial primary relief angle
Flute depth Chip pocket
Axial secondary relief angle Concavity angle of end cutting edge (*)
Ballnose Radius
* Centre area is lower than the periphery
■ Calculating cutting conditions (square endmill)
● Calculating cutting speed
Side Milling
Groove Milling
X × DC × n 1,000
1,000 × v c X × DC
v c =
n =
● Calculating feed rate per revolution and per tooth v f = n × f f = v f n
f
v f
v f = n × f z × z
f z =
=
a p
a p
n × z
z
DC
DC
a e
● Calculating notch width (D 1 ) D 1 =2 × 2 × RE × a p - a p 2
(Ballnose Endmill)
v c : Cutting speed (m/min) X : π ≈3.14 DC : Endmill diameter (mm) n : Spindle speed (min -1 ) v f : Feed rate (mm/min) f : F eed rate per revolution (mm/rev) f z : Feed rate per tooth (mm/t) z : Number of teeth a p : Depth of cut in axial direction (mm) a e : Depth of cut in radial direction (mm) RE : Ballnose radius
● Cutting speed and feed rate (per revolution and per tooth) are calculated using the same formula as the square endmill.
DC
a p Depth of cut
RE
RE
a p
D 1
D 1
p f
p f Pick feed
N59
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