PROFILE OF A LINE

PROFILE

Controls the form of individual line elements on any surface

~ DATUM OPTIONALASME Y14.5-2018 §11

Profile of a line controls the shape of individual cross-sectional line elements of a surface relative to a true profile defined by basic dimensions. Without a datum it controls form only. With a datum it also controls orientation and location of each line element independently.

WHEN TO USE IT

Use profile of a line when individual cross-sections of a complex surface must conform to a true profile, but variations from section to section are acceptable. Common for extruded profiles, airfoils, or any surface where consistent cross-sectional shape matters but alignment between sections does not.

COMMON MISTAKES

Using profile of a line when profile of a surface is needed — profile of a line only controls individual cross-sections, not the full surface simultaneously

Omitting basic dimensions that define the true profile

Confusing unilateral and bilateral tolerance zones — specify which side the tolerance applies to if unilateral

Not specifying the extent of the profile control on the drawing

IS YOUR CALLOUT CORRECT?

Check these before releasing your drawing.

Are all dimensions defining the true profile specified as basic (boxed)?

Profile controls require basic dimensions to define the true profile shape.

Is the intent to control individual line elements rather than the full surface?

If the full surface must be controlled simultaneously, use profile of a surface.

Is the tolerance zone bilateral (equal on both sides) or unilateral?

If unilateral, the drawing must clearly indicate which side of the true profile the tolerance applies to.

RELATED SYMBOLS

OTHER PROFILE CONTROLS

⌓Profile of a Surface

Redprint checks profile of a line automatically

Redprint checks that profile callouts are accompanied by basic dimensions defining the true profile and verifies datum references are present when orientation or location is required.

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