Engineering design

W5-3

Professor: Oscar Alonso Rosete Beas

Previous session

Introduction to drawing standards
Introducing the title block
Portfolio drafts(3,4)

Agenda

Drawing terminology
Bisecting lines
Portfolio draft (5)

Laboratory sessions

CAT´S LAB A

First activity

Second activity

Third activity

Portfolio draft (4)

Portfolio draft (5)

title block

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. Fillets are also used to help a casting or forging release a mold or die. Fillets are arcs given as radius dimensions. The fillet size depends on the function of the part and the manufacturing process used to make the fillet.

Round

A round is a small-radius outside corner formed between two surfaces. Rounds are used to refine sharp corners. In situations in which a sharp corner must be relieved and a round is not required, a slight corner relief can be used, referred to as a break corner. The note BREAK CORNER can be used on the drawing. Another option is to provide a note that specifies REMOVE ALL BURRS AND SHARP EDGES.
Burrs are machining fragments that are often left on a part after machining.

Fillet

Sketching a one-view drawing with fillets

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.