OpenSCAD Helical Thread & Matching Cap example
Advanced geometry
Lesson 18 of 22
Construct a real sampled helical ridge and subtract a clearance-adjusted mating thread.
Try changing:
core_radiuspitchturnsthread_depthclearancepartHigh compile complexity. Helical polyhedra and internal thread subtraction are expensive; preview uses fewer samples.
How this model works
Four vertices describe a trapezoidal radial/axial thread section. Sampling that section around successive turns generates the ridge; indexed triangles connect adjacent sections into a closed polyhedron. The cap subtracts an enlarged copy of the plug, including radial and axial clearance. It is shown beside the plug, closed end down; invert it for assembly. This is a demonstrative custom thread, not an ISO, metric, or pressure-rated connection. Fit and strength require physical testing.
main.scad
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Z up · geometry preview
Your geometry will appear here
Preview or render the model to inspect it in 3D.
Geometry-only STL preview
Grid 10 units · Drag: orbit · Right-drag / two fingers: pan · Scroll / pinch: zoom
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Make it your own
Change pitch and turns, then inspect the matching internal groove. Compare preview and final facets. Make a short one-turn fit coupon before attempting a complete printed pair.
Change one parameter at a time and inspect the result. Use the workspace reset action to return to this lesson’s original model.
