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United Kingdom 
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For steels
For stainless steels
For cast iron
For non-ferrous metal
For difficult to cut material
For hardened material
Inch
Cutting Speed (vc)
Check the item you want to calculate, input values in the two boxes, and then press the Calculate button.
vc (SFM) : Cutting Speed
Dm (Inch) : Work Material Diameter
π (3.14) : Pi
n (min-1) : Main Axis Spindle Speed
Problem
What is the cutting speed when main axis spindle speed is 700min-1and external diameter is Φ2 ?
Answer
Substitute π=3.14, Dm=2, n=700 into the formulae.
vc=(π×Dm×n)÷12=(3.14×2×700)÷12
=366.33SFM
Cutting speed is 366.33SFM.
Feed (f)
Check the item you want to calculate, input values in the two boxes, and then press the Calculate button.
f (IPR) : Feed per Revolution
I (IPM) : Cutting Length per Min.
n (min-1) : Main Axis Spindle Speed
Problem
What is the feed per revolution when main axis spindle speed is 500min-1 and cutting length per minute is 120mm/min ?
Answer
Substitute n=500, I=4.72 into the formulae.
f=l÷n=4.72÷500=.009IPR
The answer is .009IPR.
Cutting time (Tc)
Input the values.
Tc(min):Cutting Time
lm(Inch):Work Material Length
I (IPM):Cutting Length per Min.
Problem
What is the cutting time when 4inch work material is machined at 1000min-1 with feed = .008IPR ?
Answer
First, calculate the cutting length per min. from the feed and spindle speed.
l=f×n=.008×1000=8IPM
Substitute the answer above into the formulae.
Tc=lm÷l=4÷8=0.5(min)
0.5×60=30(sec) The answer is 30 sec.
Theoretical finished surface roughness (h)
Input the values.
h (µinch):Finished Surface Roughness
f (IPR):Feed per Revolution
RE (inch):Insert Corner Radius
Problem
What is the theoretical finished surface roughness when the insert corner radius is .031inch and feed is .008 IPR ?
Answer
Substitute f=.008IPR, RE=.031 into the formulae.
h=(.008)2÷(8×.031)×1000=.258µinch
The theoretical finished surface roughness is .258µinch.
Metric
Cutting Speed (vc)
Check the item you want to calculate, input values in the two boxes, and then press the Calculate button.
※Divide by 1000 to change to m from mm.
vc (m/min) : Cutting Speed
Dm (mm) : Workpiece Diameter
π (3.14) : Pi
n (min-1) : Main Axis Spindle Speed
Example
What is the cutting speed when main axis spindle speed is 700min-1and external diameter is Φ50 ?
Answer
Substitute π=3.14, Dm=50, n=700 into the formula.
vc=(π×Dm×n)÷1000=(3.14×50×700)÷1000
=110(m/min)
Cutting speed is 110m/min.
Feed (f)
Check the item you want to calculate, input values in the two boxes, and then press the Calculate button.
f (mm/rev) : Feed per Revolution
I (mm/min) : Cutting Length per Min.
n (min-1) : Main Axis Spindle Speed
Example
What is the feed per revolution when main axis spindle speed is 500min-1 and cutting length per minute is 120mm/min ?
Answer
Substitute n=500, I=120 into the formula.
f=l÷n=120÷500=0.24(mm/rev)
The answer is 0.24mm/rev.
Cutting time (Tc)
Input the values.
Tc(min):Cutting Time
lm(mm):Workpiece Length
ｌ(mm/min):Cutting Length per Min.
Example
What is the cutting time when 100mm workpiece is machined at 1000min-1 with feed = 0.2mm/rev ?
Answer
First, calculate the cutting length per min. from the feed and spindle speed.
l=f×n=0.2×1000=200(mm/min)
Substitute the answer above into the formula.
Tc=lm÷l=100÷200=0.5(min)
0.5×60=30(sec)The answer is 30 sec.
Theoretical finished surface roughness (h)
Input the values.
h (µm):Finished Surface Roughness
f (mm/rev):Feed per Revolution
RE (mm):Insert Corner Radius
Example
What is the theoretical finished surface roughness when the insert corner radius is 0.8mm and feed is 0.2mm/rev ?
Answer
Substitute f=0.2mm/rev, RE=0.8 into the formula.
h=0.22÷(8×0.8)×1000=6.25µm
The theoretical finished surface roughness is 6µm.
For finish cutting
For medium cutting
For rough cutting
