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ppr fittings-NF-4011-Newsun Industry Co., Ltd
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CNC Formulas

1. Trigonometric function calculation
1.tanθ=b/a θ=tan-1b/a
2.Sinθ=b/c Cos=a/c
 
2. Calculation of cutting speed
Vc=(π*D*S)/1000
Vc: linear velocity (m/min) π: circumference ratio (3.14159) D: tool diameter (mm)
S: Speed ​​(rpm)
Example. Use Φ25 milling cutter Vc to be (m/min)25 to find S=?rpm
Vc=πds/1000
25=π*25*S/1000
S=1000*25/ π*25
S=320rpm
 
Three, the calculation of the feed (F value)
F=S*Z*Fz
F: Feed rate (mm/min) S: Rotation speed (rpm) Z: Number of blades
Fz: (actual feed per edge)
Example. A standard 2-flute end mill cuts a workpiece at a speed of 2000rpm), and find the feed (F
Value)? (Fz=0.25mm)
F=S*Z*Fz
F=2000*2*0.25
F=1000(mm/min)
 
Fourth, the calculation of the residual material height
Scallop=(ae*ae)/8R
Scallop: residual material height (mm) ae: XYpitch (mm) R tool radius (mm)
Example. Φ20R10 refined 2 blades, the pre-residual height is 0.002mm, what is the pitch
less? mm
Scallop=ae2/8R
0.002=ae2/8*10
ae=0.4mm
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)
Example. It is known that a mold cavity needs to be processed with an escape angle (as shown in the figure),
The milling cutter used is ψ10; may the escape angle hole be the smallest
For what? What is the center of the circle?
Φ=√ 2R2
Φ=√2*52
Φ=7.1(mm)
X, Y = D/4
X, Y = 10/4
X, Y = 2.5 mm
The coordinates of the center of the circle are (2.5, -2.5)
 
6. Calculation of reclaiming amount
Q=(ae*ap*F)/1000
Q: Reclaiming amount (cm3/min) ae: XYpitch(mm) ap: Zpitch(mm)
Example. Knowing that a mold must be processed with the same height as the cavity, the XYpitch of the Φ35R5 knife is 60% of the tool, and each layer cuts 1.5mm, and the feed rate is 2000mm/min. What is the amount of material taken for this tool?
Q=(ae*ap*F)/1000
Q=35*0.6*1.5*2000/1000
Q=63 cm3/min
 
Seven, calculation of feed per edge
Fz=hm * √(D/ap)
Fz: Implementation of the feed per blade hm: Theoretical feed per blade ap: Zpitch(mm)
D: Blade diameter (mm)
Example (provided that the depo XYpitch is 60% of the tool)
For the depoΦ35R5 knife, the cutting hm of NAK80 material is 0.15mm, and the cutting depth of Z axis is 1.5mm.
Fz=hm * √(D/ap)
Fz=0.2*√10/1.5
Fz=0.5mm

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