Blueprint Reading and Technical Drawings Flashcards

What type of line in a technical drawing represents the visible outline or edge of an object?

Answer: Object line (visible line)

Object lines (visible lines) are solid, thick continuous lines that represent edges and outlines directly visible from the current viewing angle.

What do dashed lines represent in a technical drawing?

Answer: Edges or features hidden behind a visible surface

Dashed lines (hidden lines) represent edges or features that exist behind the visible surface and cannot be seen from the current viewing angle.

In blueprint reading, what does the abbreviation 'OD' stand for?

Answer: Outer Diameter

OD stands for Outer Diameter, which refers to the measurement across the outside of a circular or cylindrical object such as a pipe or shaft.

What is the primary purpose of the title block in a technical drawing?

Answer: To provide part name, material, scale, revision history, and other identifying information

The title block contains essential information including part name, part number, material specification, drawing scale, drafter name, and revision history used to control the document.

What does the scale notation '1:2' on a technical drawing mean?

Answer: The drawing is half the actual size of the object

A scale of 1:2 means the drawing is drawn at half actual size, so every unit measured on the drawing represents two units on the real object.

In a standard multi-view (orthographic) drawing, which view shows the object as seen directly from the front?

Answer: Front view

The front view (front elevation) shows the object as seen straight on from the front and is typically chosen to show the most descriptive or characteristic face of the part.

What does a centerline (alternating long and short dashes) indicate in a technical drawing?

Answer: The axis of symmetry or center of a hole, cylinder, or symmetric feature

Centerlines indicate the axis of symmetry for circular features like holes and cylinders, or the line of symmetry for symmetric parts, serving as reference axes for measurement.