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www.napgladu.com Algorithms for Saw Blades

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Abbreviations and Symbols =Pi or 3.14 D= Diameter of tool v f = Feed rate of material s Z =Chip load per tooth n=Spindle Speed in Revolutions per minute (RPM) p=Pitch or distance from tooth-to-tooth z c =Effective teeth to make a kerf cut (Example: A 60 tooth ATB is z c =30) v c =Rim speed (Cutting speed on periphery) z= Number of Teeth in the tool 2 Confidential Information-Do Not Duplicate10-8-2010

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Chip Load (f z ) Chart for Woodworking Tools 10-8-2010 3 Confidential Information-Do Not Duplicate

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Calculating the Chip Load (s z ) s Z =Chip load per tooth z=Number of teeth in tool n=Spindle Speed in Revolutions per minute (RPM) v f =Feed rate English: Enter in feet per minute Metric: Enter in meters per minute z c =Number of teeth to make a complete kerf cut English: Chip load result is in thousandths of an inch (in.) s Z =(v f x 12) ÷ (z x n)x z c Metric: Chip load result is in millimeters (mm) s Z =(v f x 1000) ÷ (z x n)x z c 4 Confidential Information-Do Not Duplicate10-8-2010

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Calculating the Pitch (p) p =Pitch or distance from tooth-to-tooth =3.14 D=Diameter of the tool English: Enter diameter in inches Metric: Enter diameter in mm z =Number of teeth in the tool English: Pitch result is in thousandths of an inch (.000) p=( x D) ÷ z Metric: Pitch result is in millimeters (mm) p=( x D) ÷ z 5 Confidential Information-Do Not Duplicate10-8-2010

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Calculating the # of teeth Required (z) z =Number of teeth =3.14 D=Diameter of the tool English: Enter diameter in inches Metric: Enter diameter in mm p=Pitch or distance desired from tooth-to-tooth English: Enter pitch in inches Metric: Enter diameter in mm z =( x D) ÷ p=Number of teeth required 6 Confidential Information-Do Not Duplicate10-8-2010

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Recommended Rim Speed 10-8-2010 7 Confidential Information-Do Not Duplicate

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Calculating the Rim Speed (v c ) v c =Rim speed (Cutting speed) D=Diameter of the tool n=Spindle Speed in Revolutions per minute (RPM) =3.14 English: Rim speed measured in feet per second (ft./sec.) v c =(D x x n) ÷ (12x 60)or (.262 x D x n) ÷ 60 English: Rim speed measured in feet per minute (ft./min.) v c =(D x x n) ÷ 12or.262 x D x n Metric: Rim speed measured in meters per second (m/s) v c =(D x x n) ÷ (1000 x 60) Metric: Rim speed measured in meters minute (m/min.) v c =(D x x n) ÷ 1000 10-8-2010 8 Confidential Information-Do Not Duplicate

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Calculating the Feed Rate (v f ) v f =Feed rate required (Feet or Meters/Minute) f z =Desired or recommended chip load English measurement in thousandths of an inch Metric measurement in mm n=Spindle Speed in Revolutions per minute (RPM) z =Number of teeth in the tool z c = Effective teeth to make a kerf cut English: Feed rate measured in feet per minute (ft./min.) v f =(f z x z x n) ÷ 12 Metric: Feed rate measured in meters per minute (m/min.) v f =(f z x z x n) ÷ 1000 10-8-2010 9 Confidential Information-Do Not Duplicate

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Calculating the Spindle Speed RPM (n) n= Spindle Speed in Revolutions per minute (RPM) v c =Rim speed (Cutting speed on periphery) English: Enter in feet per minute D=Diameter of the tool English: Enter in inches n=(3.82 x v c ) ÷ D 10-8-2010 10 Confidential Information-Do Not Duplicate

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