

Useful Formulas for Machining
#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) 


Carbide Inserts  Mill
Turn, Face(lathe) 
800 SFM
800 SFM 
.001 IPT
.003 IPR 

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 


Carbide Inserts  Turn, face(lathe)  200 SFM  .006IPR 

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 