Herringbone Gear Generator
Generate a herringbone gear with two opposing helical halves meeting at the center. Set module, teeth, helix angle and height, inspect the model and export the STL. Opposing helices can balance axial force when equally loaded; alignment and printed fit still need checking.
How the two helical halves work
The generator reverses the helix at half the gear height, forming a continuous V-shaped tooth without a relief groove. Both halves use the selected base geometry. Choose a compatible mate with matching module system, pressure angle and helix magnitude and the correct opposite hand. Confirm the V orientation in the intended assembled position.
In an ideal symmetric pair, equal loading on the two halves balances the opposing axial force components. Manufacturing error, shaft deflection or unequal contact can leave residual thrust. No measured one-percent thrust limit or automatic self-alignment guarantee applies to these printed models.
Plan the assembly before printing
The opposing helices constrain relative axial movement, but this can make assembly harder than for a spur pair. Check whether shafts or supports can separate enough to engage the gears. The generator exports gear geometry, not a complete assembled print-in-place gearbox. A carrier, housing and bearings are separate design work.
Inspect the center reversal, flank overhangs and seam in the slicer. The 15 degree preset is a model example, not a proven optimum for every printer. Follow the gear printing guide to document material, orientation and fit checks. An unloaded hand rotation is not a service-life test.
Choose the tooth form for the mechanism
Use the helical generator when one helix suits the assembly and the supports can take its axial force. Consider herringbone when the opposed halves help the mechanical layout and both halves can be aligned. A spur gear is simpler to inspect and assemble for an initial prototype.
When comparing tooth forms, keep module system, tooth counts, pressure angle and face width recorded. Changing the tooth form changes the contact; it does not itself prove reduced sound or wear. Check the module guide before comparing dimensions from normal and transverse settings.
Frequently asked questions
What is the difference between herringbone and double helical?
In common maker usage the terms mean the same thing: two mirrored helical halves on one gear. Strictly, a herringbone has no groove between the halves while an industrial double helical often has a relief groove for the cutting tool. Printed gears need no groove, so this generator builds the continuous herringbone form.
Do herringbone gears need supports when printing?
Inspect the chosen helix, face width, center reversal and orientation in the slicer. Some configurations can print without supports, but this is not guaranteed across the input range.
How do two herringbone gears mesh?
Match the relevant module and angle definitions with the correct opposite hand, then check V alignment, center distance and an assembly path. Matching defaults do not position the physical shafts.
Do herringbone gears eliminate axial force?
Opposing helices balance their axial force components in an ideal symmetric, equally loaded pair. Unequal contact and misalignment can leave residual thrust. The supports still need an application-specific design.
Herringbone vs helical: which should I print?
Choose around assembly, support and contact requirements. Herringbone can balance axial components but complicates engagement; a single helix needs thrust support. Neither has a measured sound or lifetime advantage for your print without a comparison.