Section N 25-26

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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