Useful Formulas for Machining

Note: These speeds were designed for maximum tool life, conservative in nature, and are a good place to start for higher maching speeds.
 
#1.Machining Speed
N=12V/( pi*D) =>Approx. 4V/D
V=SFM
N=RPM
D=inches
#2. Feed Rate, Mill
F=fnN (mill)
F=Feed Rate (ipm)
f=feed rate (ipt)
n=# of teeth
N= RPM
#3. Feed Rate, Lathe
F=fN(lathe, drill)
#4.Material Removal Rate, Mill
MRR=FWt
W=width of cut
t=depth of cut
#5. Material Removal Rate, Lathe
MRR=12VFt
t=depth of cut
 #6. Taylor's Tool Life
V*T^n=C
 
 
 
 
 
 Material Tool Material  Operation Cutting Speed (V) (ft/min)  Feed (f)
 Aluminum and Brass
 Carbide Inserts  Mill

Turn, Face(lathe)

800 SFM

800 SFM

 .001 IPT

.003 IPR

 High Speed Steel
 Mill

End Mill

Turn, Face(lathe)

Drill, Counterbore

Ream

Centerdrill

 150 SFM

75 SFM

150 SFM

80 SFM

40 SFM

600 SFM

 .002 IPT

.003 IPT

.003 IPT

.013 IPR

.032 IPR

Handfeed

 Low Carbon Steel
 Carbide Inserts  Turn, face(lathe)  200 SFM .006IPR
 High Speed Steel
 Turn(lathe)

Plunge Cut

Mill

Drill, Counterbore

End Mill

Thread

Centerdrill

 80SFM

30 SFM

50 SFM

40 SFM

20 SFM

12 SFM

500 RPM

 .006 IPR

Hand

.001 IPT

Hand

Hand

Thds./In

Handfeed


 

Tools, Speed and Feeds LOG
SME's Haas CNC Mill

 Material Tool  Length Flutes  Speed rpm Feed ipm D.O.C
in.
StepOver in.
 Delrin 1/4" endmill    4  1500  40    
 Delrin  1" endmill  3 4  1000  20    
Aluminum 1/2" ball mill 3 4 1000 13 .15 .15
 Aluminum  1" endmill  3 4  900 14  .20  .75
             
             
             
             
             

 

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