Engineering design

W5-2

Professor: Oscar Alonso Rosete Beas

Laboratory sessions

CAT´S LAB A

Fillet

A fillet is a small radius formed between the inside angle of two surfaces. Fillets are often used to help reduce stress and strengthen an inside corner. They are common on the inside corners of castings and forgings to strengthen corners and reduce stress during molding.

Round

A round is a small-radius outside corner formed between two surfaces. Rounds are used to refine sharp corners.

Tangency in mechanical drawing

Sketching a one-view drawing with fillets

Units expressed in mm

Sketching a one-view drawing with fillets

1. Lightly sketch the centerlines for the overall width and height of the part. Estimate overall proportions by eye, or if you know the dimensions, use a measuring scale to sketch accurately sized views. Space the enclosing rectangle equally from the margins of the sheet.

Sketching a one-view drawing with fillets

2. Block in all details lightly, keeping the drawing proportions in mind.

Sketching a one-view drawing with fillets

3. Locate the centers of circles and arcs. Block in where they will fit using rectangles. Then, sketch all arcs and circles lightly.

Sketching a one-view drawing with fillets

4. Darken your final lines.

Add annotations to the drawing using neat lettering.
Fill in the title block or title strip. Note the scale for the sketch if applicable. If not, letter NONE in the Scale area of the title block.