Robust Involute Spur Gear Generator Solidworks

grabcad

For modeling a TRUE Involute Spur Gear in Solidworks This template is built with some "IF" "THEN" statements So it is a bit more Robust than my previous postings This is with the Gullet of the first tooth cut on the "Y" axis Note: use the updated file: "Robust Involute Spur Gear Generator - Better 02.SLDPRT" Note: this template is set for the User input of the following: "Diametrical Pitch" , "Number of Teeth" & "Pressure Angle" GLOBAL VARIABLES "DiametralPitch"= 25.4 Diametral Pitch “NumTeeth"= 75 Number of Teeth “PressureAngle"= 20deg Pressure Angle “Addendum"= 1 / “DiametralPitch" Addendum “Dedendum"= 1.25 / "DiametralPitch" Dedendum “WorkingDepth"= 2 / "DiametralPitch" Working Depth - here for REF (Not used in building model) “WholeDepth"= 2.25 / "DiametralPitch" Whole Depth - here for REF (Not used in building model) “Clearance"= .19 / "DiametralPitch" Clearance “CircularPitch"= pi / "DiametralPitch" Circular Pitch - here for REF (Not used in building model) “PitchCircle"= "NumTeeth" / "DiametralPitch" Pitch Circle - or - Pitch Diameter “OutsideDiameter"= ( "NumTeeth" + 2 ) / "DiametralPitch" Outside Diameter “Fillet"= "Clearance" * cos ( "PressureAngle" ) * tan ( ( 90 + "PressureAngle" ) / 2 ) Fillet “AddendumCircle"= "PitchCircle" + ( 2 * "Addendum" ) Addendum Circle - or - Addendum Diameter “DedendumCircle"= "PitchCircle" - ( 2 * "Dedendum" ) Dedendum Circle - or - Dedendum Diameter “BaseCircle"= "PitchCircle" * cos ( "PressureAngle" ) Base Circle - Base Diameter “PitchAngle"= 360deg / "NumTeeth" Pitch Angle “Alpha"= sqr ( "PitchCircle" ^ 2 - "BaseCircle" ^ 2 ) / "BaseCircle" * 180 / PI - "PressureAngle" Alpha - Used for Calculating Beta “Beta"= ( "PitchAngle" / 4 - ( "Alpha" - 90 ) ) Beta - Used in definition of the parameters for the parametric equation driven curve “Gamma"= ( "PitchAngle" / 4 - ( "Alpha" + 90 ) ) Gamma - Used in definition of the parameters for the parametric equation driven curve “Phi"= sqr ( ( "AddendumCircle" / 2 ) ^ 2 - ( "BaseCircle" / 2 ) ^ 2 ) / ( "BaseCircle" / 2 ) Phi - Used in definition of the parameters for the parametric equation driven curve FEATURES “DCGTBC"= iif ( ( "DedendumCircle" + ( "Fillet" * 2 ) ) > "BaseCircle" , "unsuppressed" , "suppressed" ) if Dedendum Circle +2X Fillet IS GREATER THAN BaseCircle THEN Unsuppress OR Suppress FEATURE “DCLTBC"= iif ( ( "DedendumCircle" + ( "Fillet" * 2 ) ) > "BaseCircle" , "suppressed" , "unsuppressed" ) if Dedendum Circle +2X Fillet IS GREATER THAN BaseCircle THEN Suppress OR Unsuppress FEATURE “Cut-Extrude-DCGTBC"= iif ( ( "DedendumCircle" + ( "Fillet" * 2 ) ) > "BaseCircle" , "unsuppressed" , "suppressed" ) if Dedendum Circle +2X Fillet IS GREATER THAN BaseCircle THEN UnsuppressORSuppress FEATURE “Cut-Extrude-DCLTBC"= iif ( ( "DedendumCircle" + ( "Fillet" * 2 ) ) > "BaseCircle" , "suppressed" , "unsuppressed" ) if Dedendum Circle +2X Fillet IS GREATER THAN BaseCircle THEN SuppressORUnsuppress FEATURE “CirPattern-DCGTBC"= iif ( ( "DedendumCircle" + ( "Fillet" * 2 ) ) > "BaseCircle" , "unsuppressed" , "suppressed" ) if Dedendum Circle +2X Fillet IS GREATER THAN "BaseCircle" THEN UnsuppressORSuppress FEATURE “CirPattern-DCLTBC"= iif ( ( "DedendumCircle" + ( "Fillet" * 2 ) ) > "BaseCircle" , "suppressed" , "unsuppressed" ) if Dedendum Circle +2X Fillet IS GREATER THAN "BaseCircle" THEN SuppressORUnsuppress FEATURE “Fillet-DCGTBC"= iif ( ( "DedendumCircle" + ( "Fillet" * 2 ) ) > "BaseCircle" , "unsuppressed" , "suppressed" ) if Dedendum Circle +2X Fillet IS GREATER THAN "BaseCircle" THEN UnsuppressORSuppress FEATURE “Fillet-DCLTBC"= iif ( ( "DedendumCircle" + ( "Fillet" * 2 ) ) > "BaseCircle" , "suppressed" , "unsuppressed" ) if Dedendum Circle +2X Fillet IS GREATER THAN "BaseCircle" THEN SuppressORUnsuppress FEATURE EQUATIONS “D1@CirPattern-DCGTBC"="NumTeeth" “D1@CirPattern-DCLTBC"="NumTeeth" “D1@DCGTBC"="Fillet" “D1@DCLTBC"="Fillet" “D1@Fillet-DCLTBC"="Fillet"/2 “D1@Fillet-DCGTBC"="Fillet"/2 The definition in the parameters of the parametric “equation driven curve” for the involute form (first involute): Xt = ("BaseCircle"/2) * (cos(t + "Beta"*pi/180) + t*sin(t + "beta"*pi/180)) Yt = ("BaseCircle"/2) * (sin(t + "Beta"*pi/180) - t*cos(t + "beta"*pi/180)) t1 = 0 t2 = "phi" The definition in the parameters of the parametric “equation driven curve” for the involute form (second involute): Xt = ("BaseCircle"/2) * (cos(-t - "Gamma"*pi/180) - t*sin(-t - "Gamma"*pi/180)) Yt = ("BaseCircle"/2) * (sin(-t - "Gamma"*pi/180) + t*cos(-t - "Gamma"*pi/180)) t1 = 0 t2 = "phi" UPDATE 11-24-15: the NEW file: "Robust Involute Spur Gear Generator - Better 02.SLDPRT" is in fact a "BETTER, NEW & IMPROVED" Template