1. Trigonometric function calculation
1.tgθ=b/a ctgθ=a/b
2.Sinθ=b/c Cos=a/c

2. Calculation of cutting speed
Vc=(π*D*S)/1000
Vc: Linear speed (m/min)

π: Pi (3.14159)

D: Tool diameter (mm)
S: Speed (rpm)


3.The calculation of the feed (F value)
F=S＊Z＊Fz
F: Feed rate (mm/min)

S: Speed (rpm)

Z: Number of blades
Fz: (actual feed per edge)


4. The calculation of the residual material height
Scallop=(ae*ae)/8R
Scallop: Residual material height (mm)

ae: XY pitch(mm)

R tool radius (mm)


5. Calculation of escape hole
Φ＝√2R2

X, Y = D/4
Φ: Diameter of escape hole (mm)

R tool radius (mm)

D: Tool diameter (mm)


6. Calculation of reclaiming amount
Q=(ae*ap*F)/1000
Ｑ: Reclaiming amount (cm3/min)

ae: XY pitch(mm)

ap: Z pitch(mm)

7. Calculation of feed per edge
Fz=hm * √(D/ap)
Fz: Implementation of the feed per blade hm: Theoretical feed per blade ap: Z pitch(mm)
D: Blade diameter (mm)
 
8. Machining method of die edge
Cutting depth of knife edge = plate thickness-knife edge height + drill point (0.3D)
D means tool diameter


9.The drill bit drilling time formula
T(min)=L(min)/N(rpm)*f(mm/rev)
=πDL/1000vf
L: Full length of drilling

N: Number of revolutions

f: feed coefficient
D: drill diameter

v: cutting speed

Drill bit coefficient table fz

Diameter mm

Feed mm/rev

1.6~3.2

0.025~0.075

3.2~6.4

0.05~0.15

6.4~12.8

0.10~0.25

12.8~25

0.175~0.375

25 or more

0.376~0.625