MILLING SPEED & FEED CALCULATOR - INCH to METRIC
CUTTER DIAMETER CUTTING SPEED
3.940 500
INCHES FEET PER MINUTE
CUTTER DIAMETER CUTTING SPEED
100.1 152.4
MILLIMETERS METERS / MINUTE
(Z) EFFECTIVE FEED RATE INCHES
5 0.0100
FLUTES / TOOTH
FEED RATE
0.254
MM / TOOTH
METERS INCHES /
600 SFM EQUALS 182.88 58.00 EQUALS
MINUTE MINUTE
MILLING SPEED & FEED CALCULATOR - METRIC to INCH
CUTTER DIAMETER CUTTING SPEED
100 150
MILLIMETERS METERS / MINUTE
CUTTER DIAMETER CUTTING SPEED
3.94 492
INCHES FEET PER MINUTE
(Z) EFFECTIVE FEED RATE
5 0.254
FLUTES MM / TOOTH
FEED RATE INCHES
0.0100
/ TOOTH
METERS/ MM/
600 EQUALS 1968 SFM 58.00 EQUALS
MINUTE MINUTE
TURNING SPEED & FEED CALCULATOR - INCH TO METRIC
PART DIAMETER CUTTING SPEED
1.0000 100
INCHES FEET PER MINUTE
PART DIAMETER CUTTING SPEED
25.40 30.48
MILLIMETERS METERS/MINUTE
FEED RATE FEED RATE
0.005 0.127
INCH/REV (IPR) MM/REV (MMPR)
DEPTH OF CUT DEPTH OF CUT/MM
0.03 0.762
INCHES (DOC) (DOC)
METERS INCHES /
300 SFM EQUALS 91.44 70.00 EQUALS
MINUTE MINUTE
TURNING SPEED & FEED CALCULATOR - METRIC TO INCH
PART DIAMETER CUTTING SPEED
101.60 100
MILLIMETERS METERS/MINUTE
PART DIAMETER CUTTING SPEED
4.0000 328.1
INCHES FEET PER MINUTE
FEED RATE FEED RATE
0.10 0.0039
MM/REV (MMPR) INCHES/REV (IPR)
DEPTH OF CUT/MM DEPTH OF CUT
0.03 0.0012
(DOC) INCHES (DOC)
METERS/ MM/
600 EQUALS 1968 SFM 58.00 EQUALS
MINUTE MINUTE
- INCH to METRIC
485 RPM
TABLE FEED
24.24
INCHES / MIN.
TABLE FEED MM
615.7
/ MIN.
MM /
1473.2
MINUTE
- METRIC to INCH
477 RPM
TABLE FEED MM
606.4
/ MIN.
TABLE FEED
23.87
INCHES / MIN.
INCHES/
2.283
MINUTE
- INCH TO METRIC
382 RPM
MM /
1778.00
MINUTE
- METRIC TO INCH
313 RPM
INCHES/
2.283
MINUTE
CIRCLE INTERPOLATION MILLING CALCULATOR
NOTE: During internal circle interpolations, the outside diameter of a milling cutter advances faster than the centerlin
tool. This will produce a thicker chip than the calculated feed rate. (IPT) During external circle interpolations, the out
diameter of a milling cutter will advance slower than the centerline of the tool. This will produce a thinner chip than th
calculated feed rate. (IPT) When less than 1/2 of the diameter of the tool is engaged (radial) with the workpiece, there
be radial chip thinning effects. This calculator solves for both effects. Enter the cutter diameter, radial width of cut (W
the internal or external circle diameter (diameter being produced, not starting diameter) and the desired chip load per
(IPT) The calculator will give you the "adjusted" feed rate (IPT) to maintain the desired chip thickness.
INTERNAL APPLICATIONS
0.125 Cutter Diameter 0.750 Circle Diameter
(after the cut)
Radial Width of Cut Desired Chip Load
0.010 0.0050
(WOC) (IPT)
0.0077 Adjusted Chip Load (IPT)
NOTE: If the operation is not a full circle interpolation, simply input into the "Circle Diameter" data cell what the theoretical circle size would be.
EXAMPLE: A 1.00 inch diameter end mill cuts an internal 90 degree corner that has a .625 inch radius. The circle diameter is the radius X 2, or 1.25
For ID operations the radius of the cutting tool must always be equal to or smaller than the radius to be interpolated. Whenever practical, try to ha
tool diameter be less than or equal to about 1/3 of the diameter to be interpolated
EXTERNAL APPLICATIONS
1.000 Cutter Diameter 4.000 Circle Diameter
(after the cut)
Radial Width of Cut Desired Chip Load
0.500 0.0050
(WOC) (IPT)
0.0063 Adjusted Chip Load (IPT)
NOTE: If the operation is not a full circle interpolation, simply input into the "Circle Diameter" data cell what the theoretical circle size would be.
EXAMPLE: A 1.00 inch diameter end mill cuts a 45 degree corner that has a 4.00 inch radius. The circle diameter is the radius X 2, or 8.00 inches.
practical, it is a good idea to have the tool diameter greater than about 1/2 of the radial width of cut on external interpolations.
LCULATOR
faster than the centerline of the
e interpolations, the outside
ce a thinner chip than the
ith the workpiece, there will also
er, radial width of cut (WOC),
he desired chip load per tooth.
ckness.
eoretical circle size would be.
meter is the radius X 2, or 1.250 inches.
Whenever practical, try to have the
eoretical circle size would be.
e radius X 2, or 8.00 inches. Whenever
olations.
Radial Chip Thinning Calculator
NOTE: For use when less than 1/2 of the diameter of milling cutter is engaged in the width of cut (WOC) and for all slo
type cutters. The chip thickness produced with less than 1/2 of the diameter in radial contact will be thinner than calc
feed per tooth due to radial chip thinning. Enter the "desired chip load" (IPT) into the calculator. The calculator will g
"adjusted" feed rate (IPT) to produce the desired chip thickness.
RADIAL WIDTH OF
0.5000 TOOL DIAMETER 0.5000
CUT (WOC)
DESIRED CHIP ADJUSTED CHIP
0.0045 0.0045
LOAD (IPT) LOAD (IPT)
Actual maximum chip thickness if Radial Chip
0.0045 1.0000
Thinning Calculation is not used.
The output from these calculations are correct for linear machining (straight line) applications. During circle interpolations and other milling app
where a radius is generated, other factors must be accounted for. Refer to the Circle Interpolation Calculator.
lculator
e width of cut (WOC) and for all slotting
al contact will be thinner than calculated
e calculator. The calculator will give the
RADIAL WIDTH OF
CUT (WOC)
ADJUSTED CHIP
LOAD (IPT)
Radial Chip
Thinning Factor
circle interpolations and other milling applications
ircle Interpolation Calculator.
Milling Lead Angle Chip Thinning Calculator
Lead approach angles on milling cutters produce a thinner chip than the actual advance per tooth. Enter the desired c
load into the calculator. It will provide the adjusted feed per tooth to obtain the desired chip thickness. The chip thin
factor is equal to the cosine of the approach angle.
Desired Adjusted
Approach
0.005 Chip Load 45 Angle 0.00707 Chip Load
(IPT) (IPT)
NOTE: Enter the approach angle from "0" degrees. As an example, a tool that cuts a 90 degree square shoulder has a "0" degree lead.
Common Iscar Tools
F90 & E90 0 Degree Actual Chip Thickness if
E75 & F75 15 Degree
0.00354 Adjustment is not made
E45 & F45 45 Degree
E30 60 Degree
E60 30 Degree
Calculator
ooth. Enter the desired chip
hickness. The chip thinning
a "0" degree lead.
THEORETICAL MILLING SIDE WALL FINISHES
TOOL NUMBER FEED RATE
3.000 DIAMETER 5 OF FLUTES 0.0060 (IPT)
THEORETICAL
75 SURFACE FINISH (in)
This calculation is for reference purposes only. It applies to indexable insert milling cutters. The values for solid carbide
tools will be significantly lower based on tool run out, helix angle and other factors.
2
a . p . r . 250000=R t ( in ) R
t
D
NOTE: When using the Radial Chip Thinning Calculator, extremely high feed rates can result. These feed rates may produce an unacceptable side
wall finish. Use this calculator to estimate the resultant finishes at high feed rates.
CALCULATIONS PAGE
60 degree t
COMMON CONVERSIONS & CALCULATIONS
###
ENTER IN WHITE RESULTS IN YELLOW ENTER IN WHITE RESULTS IN YELLOW
###
SFM TO RPM Down THREAD HELIX ANGLE
450 3438.0 Threads Per Inch Thread Diameter
Cutter Diameter: 0.500 60 0.5
HELIX ANGLE: 0.61
RPM TO SFM ###
950 746.1 NUMBER OF THREADING PASSES - 60 DEGREE FORMS
Cutter Diameter: 3.000 Threads per Inch 12 8 Passes
UN Thread Depth External: 0.0526 UN Internal: 0.0451
IPM TO IPT SQRT
60 0.0214 To Top NUMBER OF THREADING PASSES - ACME FORMS
# Effective Flutes: 4 RPM: 700 Down Threads per Inch 6 13 Passes
Acme thread depth External 0.0950 Acme Internal 0.0980
IPT TO IPM #9-12
0.0045 15.750 NUMBER OF THREADING PASSES - STUB ACME FORMS
# Effective Flutes: 1 RPM: 3500 Threads per Inch 16 5 Passes
Stub thread depth External 0.0240 Stub Internal 0.0248
IPT TO IPR N/A
0.006 0.036 NUMBER OF THEADING PASSES - NPT FORM
# Effective Flutes: 6 Threads per Inch 8 15 Passes
NPT Thread Depths, External & Internal 0.1000 ###
IPR TO IPT N/A
0.0360 0.006 DIMINISHING INFEED PER PASS - THREADING
# Effective Flutes: 6 Total Thread Depth 0.095 # Passes 13
Depth of Cut per Pass
HORSEPOWER TO KILOWATTS Pass 1 - 4 0.0150 0.0124 0.0114 0.0087
1 0.746 #5 - 8 0.0073 0.0065 0.0059 0.0054
#9 - 12 0.0050 0.0047 0.0045 0.0042
KILOWATTS TO HORSEPOWER #13 - 16 0.0040 0.0000 0.0000 0.0000
8.110 10.876 #17 - 20 0.0000 0.0000 0.0000 0.0000
N/A
FEET TO METERS TURNING SURFACE FINISHES
1 0.3048 Corner Radius 0.03200 IPR 0.0100
Resulting Surface Finish (Ra) 124
METERS TO FEET ARCSINE
200 656.1680 Desired Surface Finish (Ra) 16
Up Corner Radius 0.01600 IPR 0.0025
INCHES TO METERS Down ###
1 0.0254 Desired Surface Finish (Ra) 32
Corner Radius 0.03101 IPR 0.0050
METERS TO INCHES All Surface Finish calculations are based on 80 degree
1 39.3701 diamond or trigon inserts. 55 & 35 degree inserts will
have rougher Ra values.
BRINELL HARDNESS TO ROCKWELL C N/A
440 47 **FOR TURNING & DRILLING NON-INTERUPTED CUTS**
THEORETICAL TOOL LIFE @ 15 MINUTES CUTTING TIME
ROCKWELL C TO BRINELL HARDNESS TIME IN CUT (MIN/PART) 0.055 # PARTS 273
32 302
ACTUAL TIME IN CUT PER INSERT - MILLING
FAHRENHEIT TO CELSIUS TOOL DIAMETER: 1 AVE. WOC: 0.5
0.0 -17.8 TIME IN CUT (MIN/PART) 1 MIN/INSERT 0.2500
CELSIUS TO FAHRENHEIT TOOL LIFE / CUTTING SPEED ADJUSTMENTS
0.0 32.0 958 SFM WILL ACHIEVE: 5 MIN/LIFE
916 SFM WILL ACHIEVE: 10 MIN/LIFE
833 SFM WILL ACHIEVE: 15 MIN/LIFE
791 SFM WILL ACHIEVE: 20 MIN/LIFE
750 SFM WILL ACHIEVE: 25 MIN/LIFE
725 SFM WILL ACHIEVE: 30 MIN/LIFE
666 SFM WILL ACHIEVE: 45 MIN/LIFE
625 SFM WILL ACHIEVE: 60 MIN/LIFE
To Top (Enter a cutting speed that attains 15 minutes of tool life)
Turning Surface Finishes
Enter Information In White Data Cells
Data Returned Gives Theoretical Ra Values in Micro Inches - To conver to RMS Multiply by 1.1 - (Ra X 1.1)
Calculations Are Based On 80 Degree Insert Geometry - 55 & 35 Degree Inserts Will Give Higher Values
To Find Resulting Ra
Insert Corner Tool Feed Rate Inches
Radius
0.0150 Per Revolution
0.0035 Resulting Ra 32
To Find Required Feed Rate (IPR)
Ra Finish Insert Corner Feed Rate
Requirement
32 Radius
0.0320 Required (IPR)
0.0052
To Top of Page
BALL NOSE & ROUND INSERT CUTTING
CALCULATIONS & ADJUSTMENTS
SPEED AND FEED CALCULATIONS
ENTER REQUIRED INFORMATION IN WHITE
DESIRED CUTTING SPEED INSERT OR ENDMILL
(SFM)
250 DIAMETER
0.62 Inches
DESIRED FEED RATE (IPT) 0.0025 Inches DEPTH OF CUT - (DOC) 0.05 Inches
NUMBER OF EFFECTIVE RADIAL CHIP THINNING ###
FLUTES
2 FACTOR
0.54458
ADJUSTED CORRECT
TRUE TOOL CORRECTED
FEED RATE TABLE FEED
DIAMETER RPM
(IPT) (IPM)
0.3376 2,828 0.0046 25.97
ROUND INSERT & BALL NOSE CUTTER SURFACE
FINISHES
ENTER REQUIRED INFORMATION IN WHITE
****SURFACE FINISHES ARE THEORETICAL AND GIVEN IN Ra VALUES - RMS = Ra x 1.11****
RESULTING REQUIRED
DIAMETER TO
TO FIND: SURFACE FINISH
IN Ra
STEPOVER TO
ACHIEVE Ra
ACHIEVE Ra
20.3 0.0050 0.18
###
ENTER ###
TOOL DIAMETER: 0.2500 0.5000
TOOL STEP OVER: 0.0080 0.0030
###
SURFACE FINISH - Ra: 4.0 4.0
###
###
###
****TO FIND Rt****
TOOL
INSERT OR TOOL
0.5 STEP 0.03 Rt: 0.0004504057
DIAMETER
OVER
###
Back to Top ###
