Optionalwidth: numberOptionalbore: numberOptionalhub: numberOptionalhubLength: numberOptionalkeyway: booleanOptionalmodule: numberOptionalteeth: numberOptionalhelixAngle: numberOptionalherringbone: booleanOptionalpressureAngle: numberOptionalprofileShift: numberOptionalbacklash: numberOptionaladdendum: numberOptionaldedendum: numberOptionalrootFillet: numberOptionalrotation: numberOptionalframe: Bit.Inputs.Base.FrameOptionalunit: unitOfLengthEnumOptionalkeyStandard: keyStandardEnumOptionalmoduleThe normal module: the tooth size measured square to the teeth, in model units, as the cutter's module. Only gears of one module mesh.
OptionalteethHow many teeth the gear has, at least 3.
OptionalhelixThe teeth's lean from the axis in degrees: positive for a right hand, negative for a left. Two external helical gears mesh at one angle in opposite hands.
OptionalherringboneWhen true, two halves of opposite hands meet halfway across the width, cancelling the push
along the axis; the half at the frame leans as helixAngle says.
OptionalpressureThe angle at which meshing teeth push on each other, in degrees, measured square to the teeth; 20 is the common standard, and meshing gears share it.
OptionalprofileHow far the teeth are moved out from the pitch circle, as a share of the module. Positive values give thicker teeth that small gears need, negative values thinner ones.
OptionalbacklashHow much thinner each tooth is round the pitch circle than a tight fit, in model units; two meshing gears leave the sum of their backlash between their teeth.
OptionaladdendumHow far the teeth reach above the pitch circle, as a share of the module.
OptionaldedendumHow deep the gaps reach below the pitch circle, as a share of the module; more than
addendum leaves room for the tips of the mating gear.
OptionalrootThe radius that rounds the bottom of each gap, as a share of the module. It shrinks to fit a narrow gap, and 0 leaves a sharp corner.
OptionalrotationHow far the gear is turned about its axis, in degrees. At 0 a tooth points along the frame's direction where the gear meets the frame.
OptionalframeThe frame the gear lies in: its centre at the origin, a tooth along the direction, its face toward the normal. Left out, the ground, facing +Y.
OptionalwidthHow thick the gear is along the frame's normal, in model units. The teeth twist through at most 1000 degrees across it, or across each half of a herringbone gear.
OptionalboreThe diameter of the hole through the middle of the gear, in model units; 0 leaves the gear whole. It must stay inside the root circle.
OptionalhubThe diameter of a hub standing out from the gear's end face, in model units, between the bore and the root circle; 0 leaves no hub.
OptionalhubHow far the hub stands out beyond the gear's end face along the normal, in model units.
OptionalkeywayWhen true, a keyway is cut along the bore, sized by keyStandard for a shaft of the bore's
diameter in unit, toward the tooth at rotation 0.
OptionalunitThe unit the gear's numbers are in, which sizes its keyway from the key standard's table; the teeth themselves take any unit.
OptionalkeyThe standard the keyway is sized by: DIN 6885 or the inch ANSI B17.1.
An involute helical gear for
parts.mechanical.gears.helicalGearand its twin with face roles: its teeth and their lean, measured square to the teeth, how thick it is, its bore and hub, and where it lies.