6.5 Chamfer Features

6.5 Chamfer Features

Quick Answer: Chamfer bevels a model edge into a flat. Use angle-distance (for example, 1 mm × 45°) or distance-distance when the drawing gives two legs. Apply feature chamfers to solid edges for break-edge callouts; use sketch chamfer only when the 2D profile itself shows the corner cut. Chamfers are not fillets—wrong tool, wrong mass.

Where fillets round an edge, chamfers cut a straight bevel. Mechanical drawings on CSWA-style parts frequently specify small edge breaks to remove burrs, clear mating faces, or match a turned shaft end. Skipping a 0.5 mm × 45° chamfer seems harmless until Mass Properties drifts past the accepted key.

Chamfer feature location and selection

Insert → Features → Chamfer (or the Chamfer tool on the Features toolbar). Selection focuses on:

• Edges — most common for break edges around a plate or hole
• Faces — chamfers all edges of the face (use carefully; easy to over-select)
• Vertices — vertex chamfer options for corner clips (less common on standard CSWA but know it exists)

Preview the bevel direction. On thick plates, confirm the chamfer is removing the intended sharp edge, not building an unexpected undercut relative to the drawing’s isometric.

Angle-distance vs distance-distance

These two modes cover almost all associate-level callouts.

Angle-distance

You specify:

1. Distance — how far the cut travels along one adjacent face from the selected edge
2. Angle — bevel angle from that face (manufacturing default often 45°)

Drawing language examples:

• 1 × 45° or 1 mm × 45°
• 0.5 × 45° BREAK EDGE
• CHAMFER 2 × 45°

At 45° with equal visual legs, a single distance produces a symmetric-looking bevel on 90° edges. If the edge is not between perpendicular faces, the geometric result still follows the PropertyManager definitions—trust the preview against the view that shows the chamfer.

Distance-distance

You specify two distances—how far the chamfer extends along each of the two faces meeting at the edge. Use this when the drawing shows unequal legs, such as 2 mm along the top face and 1 mm along the side face.

Exam trap: Entering angle-distance when the sheet clearly dimensions two different legs forces a compromise angle and wrong volume. Read the callout symbols: one number + 45° → angle-distance; two linear sizes on the bevel → distance-distance.

Break edges on exam drawings

Many CSWA and industrial drawings include a general note:

• “Break all sharp edges 0.5 × 45° unless otherwise specified”
• “Deburr and break edges”

Or they show a small chamfer symbol only on selected edges (hole mouths, shaft ends, plate perimeters).

Practical approach under the clock:

1. Scan notes and local callouts before declaring the model finished.
2. Apply one chamfer feature for all edges that share the same parameters.
3. If only hole openings are chamfered, select those circular edges only—do not auto-chamfer the entire part.
4. Run Mass Properties after break edges; small bevels still move mass on dense materials (steel) more than candidates expect when many edges are involved.

If the problem statement’s drawing does not show or note chamfers, do not invent decorative break edges—extra material removal changes the answer key.

Feature chamfer vs sketch chamfer

Parallel to fillets, SOLIDWORKS offers Sketch Chamfer inside an active sketch.

Decision rule: If the orthographic profile view already draws the corner as a straight cut before any solid shading of edge breaks, rebuild that in the sketch. If the rectangular profile is sharp in the sketch views and the iso or detail shows a small bevel on the solid edge, use feature chamfer after extrude/revolve.

Chamfer vs fillet (do not swap tools)

Multiple-choice CSWA prep items often show a picture of a beveled edge and offer Fillet as a distractor (or the reverse). On modeling items, the drawing callout is authoritative: R means fillet; × 45° or dual distance bevel means chamfer.

Chamfers on holes, shafts, and revolved parts

Common patterns:

• Hole mouth chamfer — select the circular edge on the face where the hole opens; angle-distance 0.5×45° improves pin start and matches “break edge” notes.
• Shaft end chamfer — after revolve or extrude of a cylinder, chamfer the end circular edge so the drawing’s turned end matches.
• Boss top outer edge — plate and boss corners often share one multi-edge chamfer feature.

When the parent is a revolve, circular edges are natural chamfer selections. Ensure the revolve is complete and the edge exists; chamfering before a cut that deletes that edge causes child feature failures—same parent-child discipline as fillets.

Modification steps involving chamfers

Examples of exam language:

• Change break edge from 0.5×45° to 1×45°
• Add a 2×2 distance-distance chamfer on the top outer edges
• Replace a fillet with a chamfer (rare but possible in multi-step edits)

Workflow:

1. Edit the Chamfer feature parameters (do not stack a second conflicting chamfer on the same edge without removing the first).
2. Rebuild; check for edges that can no longer support the larger setback.
3. Mass Properties with correct material and units.
4. If CoM is requested, remember asymmetric chamfers (only one side of a part) shift CoM slightly—re-measure rather than reuse the previous coordinate.

Order with other edge treatments

CSWA chamfer checklist

1. Read local callouts and general notes for break edges.
2. Choose angle-distance vs distance-distance from the dimension scheme.
3. Select only the edges the drawing marks—resist face selection that grabs extras.
4. Keep sketch chamfer vs feature chamfer aligned with where the geometry is defined.
5. Never substitute fillet for chamfer (or reverse) to “save a click.”
6. Edit parameters in place for modification questions; rebuild; Mass Properties.
7. Confirm units (mm vs inch) so “1 × 45°” is 1 mm, not 1 in, when the document is MMGS.

Chamfers finish the edge-treatment toolkit alongside fillets. Together with revolves from section 6.1, they cover intermediate rotational geometry and the edge finishing that basic-through-advanced part items use to push mass and CoM to the graded value. Practice reading callouts first, modeling second—so you never leave a 15-point part one break-edge short of the key.