# Dimensioning Pt. 2 - PowerPoint PPT Presentation

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Dimensioning Pt. 2. Drawing Scale. A scale is a proportional representation of an object. The scale of a drawing should be near the title If there are multiple views with different scales, the scale should be placed as close to the view as possible

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Dimensioning Pt. 2

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## Dimensioning Pt. 2

### Drawing Scale

• A scale is a proportional representation of an object.

• The scale of a drawing should be near the title

• If there are multiple views with different scales, the scale should be placed as close to the view as possible

• Scale can be given as 1:1, 1:2, and so on for objects that are being scaled down

• Scale can be given as 2:1, 4:1, and so on to show objects that are scaled up

### Finish Mark

• A surface texture symbol that shows a surface is to be machined or finished

### Datums

• Datums are points, lines, and surfaces that are assumed to be exact.

### Dimensioning rounds, fillets, and frustums

• Rounds and fillets are dimensioned using a radius (R)

• Frustums (truncated cone) can be dimensioned using two dimension lines in a single view

### Chamfers, Tapers, an Curves

• Chamfers are angled corners or bevels and are dimensioned using the degree and distance of the corner

• Tapers can be dimensioned by giving the length, one diameter, and the taper as a ratio

• Curves is made up of arcs and is dimensioned by the radii that have centers located by points of tangency