Helical Splined Rotor
Combining revolves, helical sweeps, and patterns into one part.
- Year
- 2024
- Software
- SolidWorks
- Focus
- Part Design · Rotating Machinery · Machining
Overview
This part packs several distinct machining features into one coaxial component: a helical-fluted head, a knurled grip band, and an internal spline for torque transfer.
I built it to practice combining fundamentally different feature types — a swept helix, a revolved body, and a patterned internal profile — on a single shared axis without them interfering.
The design intent is a component that could locate on a shaft, transmit torque through the spline, and be turned by hand at the knurl.
Engineering process
Decisions, iterations, and tradeoffs.
- 01
One axis, many features
Everything references a single centerline. Establishing that datum early meant the flutes, knurl, and bore all stayed concentric as features were added and edited.
- 02
Helix generation
The fluted head is a swept cut driven by a helix. Getting the pitch and the cut profile right took a few iterations before the flutes wrapped evenly instead of pinching at the ends.
- 03
Spline for function
The internal spline is patterned rather than sketched tooth-by-tooth, so the count and size can change in one place — the manufacturable way to define a mating feature.
Gallery
CAD · Surfacing · Renders
What I learned
A single well-placed datum axis is what keeps a multi-feature revolved part sane to edit.
Patterned features beat hand-drawn ones every time you need to change a count or size.
Helical sweeps reward getting the driving curve right before worrying about the cut profile.
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