CAD CAD Specialist Mechanical Design and Manufacturing 3

Question 1

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

Accepted Answer

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

Answer

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

Question 2

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

Accepted Answer

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

Answer

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

Question 3

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

Accepted Answer

ASME Y14.5

Answer

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

Question 4

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

Accepted Answer

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

Answer

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

Question 5

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

Accepted Answer

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

Answer

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

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