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Thứ ba, Ngày 07/08/2018 09:36

FORMULAE FOR FACE MILLING

CUTTING SPEED (vc)
Formula 
* Divide by 1,000 to change to m from mm.

vc (m/min)

Cutting Speed

D1 (mm)

Cutter Diameter

π (3.14)

Pi

n(min-1)

Main Axis Spindle Speed

Check the item you want to calculate, input values in the two boxes, and then press the Calculate button.
  D1 (mm)
  n (min-1)
  vc (m/min)
  
Graphic Image
(Problem)
What is the cutting speed when main axis spindle speed is 350min-1 and cutter diameter isø125? (Answer)
Substitute π=3.14, D1=125, n=350 into the formulae.
vc=(π×D1×n)÷1000=(3.14×125×350)÷1000 =137.4(m/min)
The cutting speed is 137.4 m/min.

 

 
FEED PER TOOTH (fz)
Formula

fz (mm/tooth)

Feed perTtooth

z

Insert Number

vf (mm/min)

Table Feed per Min.

n (min-1)

Main Axis Spindle Speed (Feed per Revolution f = z x fz)

Check the item you want to calculate, input values in the three boxes, and then press the Calculate button.
  vf (mm/min)
  z
  n (min-1)
  fz (mm/tooth)
  
Graphic Image
(Problem)
What is the feed per tooth when the main axis spindle speed is 500min-1, insert number is 10, and table feed is 500mm/min? 
(Answer)
Substitute the above figures into the formulae.
fz=vf÷(z×n)=500÷(10×500)=0.1mm/tooth
The answer is 0.1mm/tooth.

 

 
TABLE FEED (vf)
Formula

vf (mm/min)

Table Feed per Min.

z

Insert Number

fz (mm/tooth)

Feed per Tooth

n (min-1)

Main Axis Spindle Speed

Graphic Image
(Problem)
What is the table feed when feed per tooth is 0.1mm/tooth, insert number is 10, and main axis spindle speed is 500min-1? 
(Answer)
Substitute the above figures into the formulae.
vf=fz×z×n=0.1×10×500=500mm/min
The table feed is 500 mm/min.
 
CUTTING TIME (Tc)
Formula

Tc(min)

Cutting Time

vf(mm/min)

Table Feed per Min.

L (mm)

Total Table Feed Length (Workpiece Length: l+Cutter Diameter: D1)

Input the values
 L (mm)
 vf (mm/min)
  
 Tc (min)
 second (s)
Graphic Image
(Problem)
What is the cutting time required for finishing 100 mm width and 300 length surface of a cast iron (GG20) block when cutter diameter is ø200, the number of inserts is 16, the cutting speed is 125m/min, and feed per tooth is 0.25 mm. (spindle speed is 200 min-1) 
(Answer)
Calculate table feed per min vf=0.25×16×200=800mm/min
Calculate total table feed length. L=300+200=500mm
Substitute the above answers into the formulae.
Tc=500÷800=0.625(min)
0.625×60=37.5(sec). The answer is 37.5 sec.

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