CAD Specialist Mechanical Design and Manufacturing Flashcards

In parametric mechanical CAD, what is the difference between a 'driven' dimension and a 'driving' dimension?

Answer: Driving dimensions control geometry; driven dimensions display reference values controlled by the model

Driving dimensions actively control model geometry, while driven (reference) dimensions are calculated and displayed but do not control the model.

What is the purpose of a 'knurl' callout on a mechanical drawing?

Answer: Indicating a textured surface pattern rolled onto a cylindrical part for grip

A knurl callout specifies a diamond or straight cross-hatch pattern rolled into a cylindrical surface to improve grip or enable press-fit assembly.

Which ASME standard governs engineering drawing practices and GD&T in the United States?

Answer: ASME Y14.5

ASME Y14.5 is the US standard that defines all rules, symbols, and practices for Geometric Dimensioning and Tolerancing on engineering drawings.

In CNC machining, what does the G-code command 'G00' specify?

Answer: Rapid traverse positioning (non-cutting movement at maximum machine speed)

G00 commands the CNC machine to move the tool at maximum rapid speed for positioning, not for cutting material.

What is 'design for manufacturability' (DFM) in the context of mechanical CAD?

Answer: Designing parts with geometries and tolerances that are practical and cost-effective to produce

DFM is the practice of designing parts so that their geometry, tolerances, and features are feasible and economical to manufacture.

In a mechanical exploded assembly drawing, what is the purpose of the 'explode lines' (also called witness lines or lead lines)?

Answer: To visually connect each disassembled part back to its assembly position along the axis of disassembly

Explode lines in an exploded view connect each component to its assembly position, showing how parts come together along their assembly axis.