Corner radius analysis: find sharp corners and tight fillets

What it helps you catch

• Sharp inside corners — where a moulded part cracks under load, plastic flows badly, and a rotating cutter cannot reach at all.
• Fillets too tight for the smallest cutter a machinist wants to use, which means a smaller tool, a slower job, or a corner that comes out bigger than drawn.
• Inconsistent radii — the one corner modelled at R0.5 among dozens at R2.
• Outside rounds, which become inside corners in the steel of a mould.

What you see

Coloured corners

Each filleted corner coloured by its radius: red where it is tight, blue where it is generous. Faces that are not corners stay grey.

Sharp corners

Corners with no fillet at all, drawn as lines of their own colour along the edge.

The radius anywhere

Hover over a corner to read its radius.

The figures

How many corners, how many are sharp, and the tightest radius on the part.

How to use it

1. 1

   Open your part and pick Corners

   Drop a STEP file on the page, choose Analyze, then the Corners map.

2. 2

   Choose which corners

   Internal (the default) for inside corners, External for outside rounds, or Both.

3. 3

   Read it as a machinist would

   Set Direction to the axis the cutter comes down. The map then keeps the corners a cutter works along, and tells you the largest cutter that fits every one of them.

4. 4

   Check against a target

   Turn on Target Radius and choose Show Tighter or Show Larger. Corners that meet it turn dark grey, and only the ones that miss stay coloured.

Good to know

The corners are read from the faces in your STEP file, so the map needs a STEP file rather than a mesh. On a freeform or sculpted part, where few faces are simple shapes, PartCheck says it cannot measure the corners rather than guess. For a full check against moulding or machining rules, corners included, run the injection moulding or CNC DFM check, whose report lists them.

Questions