CAD tip # 6537:

Question

CAD

% platform category

How to model a 3D thread (screw) in AutoCAD?

Although 3D threads (nut/bold) are usually not modelled in detail and CAD applications like Inventor have internal functions for representing threads, sometimes you may need to really model a true 3D thread in AutoCAD.

The easiest way is to use a combination of the HELIX and SWEEP modelling commands.

First prepare a profile of a single thread (e.g. a filleted triangle), 3DROTATE it to be perpendicular to the sweep path, and then sweep this profile along a 3D spiral created by the Helix command.

In older versions of AutoCAD you can also use the 3DSPIRAL Lisp utility (see the Download section).

You can also use of the threaded blocks in our CAD blocks library.

ACAD

*CAD

13.2.2009 34516×

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applies to: AutoCAD ·

See also:
Tip 14598:	Thread machining in Autodesk Fusion.
Tip 14405:	How do I create a 3D helix or 2D spiral sketch in Fusion?
Tip 14110:	Comparison of speed and CPU core usage in CAM operations of commercial and non-commercial versions of Autodesk Fusion.
Tip 13935:	How to get machining data from a thread designed in Fusion?
Tip 13040:	iLogic - display information about complexity of an Inventor part.

Selected tip: Compatibility of Autodesk CAD applications with 64-bit Windows versions.

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