best e gravel bike under 3000 El Camino Apex1 Flat Bar Size:XLong more climbs army medic bag LEGO Stig vs Lightning

best e gravel bike under 3000 El Camino Apex1 Flat Bar Size:XLong more climbs army medic bag LEGO Stig vs Lightning

LEGO Stig vs Lightning McQueen | Top Gear

Transition Point For an Undercut Gear: The Root Fillet Curve lies inside the Involute Curve A deeper cut Weakens the Tooth Intentional Undercut Intentional Undercut To Prevent Notch after Finishing (Grinding) Hobbed Gears are manufactured with Undercut For free movement of Finishing Tool Without Undercut, Finishing Operation will Create a notch Undercut: Pictorial Explainer Protuberance Protruded Hob Tip Provided on Hob To Undercut the Unfinished Gear To prevent notch creation during finishing operation Roll Angle and Diameter Position of each point on the Gear Involute can be identified by it's Roll angle or Roll Diameter The Picture depicts the Roll angle and Diameter of a Specific Point "A" on the Involute Roll angle = ξA = [sqrt (rA^2 - rb^2)]/rb --- in Radians ξA: Roll Angle of Point "A" rA: Radius of intended Point "A" rb: Radius of Base Diameter Pressure Angle @ a Particular Point Each point on the Involute has its discrete Pressure Angle The picture depicts Pressure Angle of point "A" ξA = tan αA ---- in Radians ξA: Roll Angle of Point "A" αA: Pressure Angle of Point "A" Helix Angle Angle between the Gear Tooth and Gear Axis At each Roll Angle, Helix Angle will be different Normal Module Inverse of Diametral Pitch PCD/T or D/T inches (D/T) * 25.4 mm This gives an insight into the size of the Gear In the Direction Normal to the Teeth Transverse and Normal Direction is same for Spur Gears Transverse Module Helical Gears In the Direction Tangential to the Gear Cylinder Normal Module / Cos (helix angle) Axial Pitch Normal Pitch Distance between 2 adjacent Teeth (same flank) Normal to Teeth Transverse Pitch Distance between 2 adjacent Teeth (same flank) in Transverse Direction Axial Pitch Applicable to Helical Gears Draw a line Parallel to Axis from a Point of a Tooth to it's Adjacent Tooth Length of the Line will denote the Axial Pitch Contact Ratio (Transverse) Contact Ratio (Transverse) Ratio of Contact Length and Base Pitch It depicts the Number of Teeth in Contact High Contact Ratio is desirable More Teeth in Contact means less load on one particular tooth, hence higher life Higher Contact Ratio also helps with Gear NVH Characteristics Axial Contact Ratio Contact Ratio (Transverse) Also called Overlap Ratio Depicts how much the mating teeth overlap each other Function of Gear Face Width and Helix Angle Face Width / Axial Pitch Total Contact Ratio Total Contact Ratio Total Contact Ratio Transverse Contact Ratio + Axial Contact Ratio For Spur Gears: Axial Contact Ratio = 0

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