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Cutting Data & Formulas
When Does an End Mill Need Resharpening?
  • When wear land reaches a certain level as a function of diameter and type of end mill (for values see table to right).
  • When the chips change to a blue color.
  • When dimensional accuracy is not acheived.
  • When large burs appear on the edge of the workpiece.
  • When smoke and an unusual noise appear.
  • When motor amperemeter levels increase.

Maximum Permited Wear Land before Resharpening
Diameter
Finisher 
< 3/8
 
~0.004
 
< 3/4
 
~0.006
 
< 1
 
~0.008
 
< 1-1/4
 
~0.010

The above values indicate the upper limits after which there may be a break.

Formulas
Feed per Tooth: IPT= IPM ÷ Z ÷ RPM
Spindle Speed: RPM = SFM x 3.82 ÷ D
Table Feed: IPM= IPT x Z x RPM
Cutting Speed: SFM= D x 0.26 x RPM
Inch (Feed) per Revolution: IPR (FR) = IPM ÷ RPM
Metal Removal Cubic Inches per Minute: MR= IPM x RDC x ADC

Legend  
  
D = Tool Diameter
Z = No. of Flutes
FR = Feed per Revolution
IPM = Table Feed
IPR = Inch per Revolution
IPT = Feed per Tooth
 SFM = Cutting SpeedRPM = Spindle Speed
ADC = Axial Depth of Cut (Length)
HP = Actual Horsepower Available at running RPM
PC = Power Constants for HP (HP/Cl-MR)
RDC = Radial Depth of Cut (Width)
MR = Metal Removal Rate (Cubic Inches per Minute)
 

   NC Niagara Cutter, Inc. • 200 John James Audubon Pkwy • Amherst, NY 14228 USA
    Phone: 716-689-8400 • Fax: 716-689-8485 • E-mail: NiaCut@NiagaraCutter.com     © 2008 Niagara Cutter, Inc.