How to Design a Camshaft in SOLIDWORKS

A camshaft model in SOLIDWORKS is built from a central shaft, cam lobes, reference planes, and controlled profiles. The exact shape depends on the mechanism, but the modeling workflow should stay organized so lobe timing, spacing, and orientation can be edited later.

Start with the shaft

Create the main shaft first. A simple revolved or extruded cylinder gives you the base reference for the rest of the model. Dimension the diameter and length clearly, then add reference planes for each cam lobe location.

Keep the shaft centered on the origin or a clear reference axis. A consistent axis makes lobe placement, circular patterns, and assembly rotation much easier to control later.

Create the cam lobe profile

The lobe profile controls the cam action, so sketch it carefully. Use arcs, splines, or imported curve data depending on the design requirement. For a conceptual model, a simple eccentric profile may be enough. For a functional cam, the profile should come from the required lift and timing data.

If you are only making a visual camshaft, the lobe can be simplified. If the cam is meant to drive motion, avoid guessing the shape. Use the required follower motion, base circle, lift, and duration as the starting point.

Place lobes along the shaft

Use planes, sketches, or patterned features to locate lobes along the shaft. Keep spacing and angular orientation controlled with dimensions or mates. If the camshaft has several lobes, name important planes and sketches so the feature tree remains readable.

For repeated lobes, consider whether a pattern is appropriate. A pattern is fast, but individual lobes may need different angular positions or profiles depending on the mechanism.

Control lobe timing

Cam timing is represented by angular position. If lobes must be rotated relative to each other, use construction geometry or reference planes to control those angles. Avoid rotating features by eye because small angular errors can make the model misleading.

Document the angular references in the model or drawing. Even a simple note can help another user understand why a lobe is placed at a certain angle.

Add journals and end features

After the basic lobes are created, add journals, shoulders, end details, keyways, holes, or other mounting features. Keep these features separate from the lobe sketches so they can be edited without disturbing the cam profile.

Check clearances and motion

If the camshaft will be used in an assembly, check follower clearance and rotation. A static part can look correct but still interfere with nearby components. Use section views, interference checks, or simple motion review to confirm the design space.

For more detailed validation, check the follower contact area through rotation. This can reveal sharp transitions, unrealistic lift changes, or collisions that are not obvious from a single view.

Troubleshooting

If the cam profile is hard to edit, simplify the sketch and control the important points with dimensions. If patterned lobes rotate incorrectly, check the reference axis and angular settings. If the file becomes slow, suppress cosmetic details while editing the main geometry.

A camshaft model should communicate the geometry and timing clearly. Keep references named, sketches controlled, and downstream drawings checked before using the model for manufacturing or simulation.

If the camshaft is only for layout, label it as a conceptual model. If it is for production, confirm tolerances, surface finish, heat treatment, and material outside the CAD shape as well.