Tolerance and manufacturability: Is it harder to manufacture a part specified with two decimal places than the same part with four decimal places?

Introduction / Context:
Decimal places in dimensions often imply tolerance tightness. More decimal places typically signal tighter allowable variation, which increases manufacturing difficulty and cost. Understanding this relationship helps designers assign realistic tolerances that achieve function without unnecessary expense.

Given Data / Assumptions:

• A two-decimal inch dimension often implies a looser general tolerance (for example, +/- .01).
• A four-decimal inch dimension often implies a tighter general tolerance (for example, +/- .0005).
• General tolerances are commonly specified in the title block.

Concept / Approach:
Manufacturing difficulty rises as tolerances tighten. Achieving tighter control requires more precise machines, additional inspection, slower feeds/speeds, environmental control, and more scrap risk. Therefore, the statement that two decimal places are “more difficult” than four reverses the conventional reality.

Step-by-Step Solution:

Verification / Alternative check:
Supplier quotes generally increase as tolerances tighten; shop travelers include additional inspection steps for tighter decimals, confirming the common industry pattern.

Why Other Options Are Wrong:

Common Pitfalls:
Specifying overly tight decimals without functional need; mixing decimal precision across related features, causing unnecessary cost.

Final Answer:
Incorrect