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Difficulty: MediumMeasuring and Layout Tools

When performing precision layout on a sheet metal blank, a technician needs to create small, shallow reference dimples along scribed lines to seat divider legs and preserve layout points without distorting the workpiece. Which tool is specifically designed for this purpose?

  1. A
    Center punch
  2. Prick punchAnswer
  3. C
    Drift punch
  4. D
    Scriber

Answer

Prick punch
A prick punch has a sharp, narrow point ground at a 30-to-60-degree angle, making it ideal for placing small, precise indentations along layout lines. These shallow marks keep layout lines visible if the layout fluid wears off and provide exact pivot points for dividers without distorting the metal.

Step-by-Step Solution

1
Analyze the layout requirement in the shop scenario.
The task requires creating shallow, precise locating dimples along layout lines to anchor divider compass points and preserve reference marks.
Accurate sheet metal layout requires fine reference marks that do not distort the metal or alter line locations.
2
Evaluate the tip geometry and intended application of layout and striking tools.
A prick punch is ground to a narrow, sharp angle (30∘30^\circ to 60∘60^\circ) that penetrates easily under light hammer force to produce small, clean indentations, whereas a center punch is ground to a blunter 90∘90^\circ angle for drilling starts.
The narrow point of the prick punch centers precisely on scribed intersecting lines without displacing excess metal.

Key Concept

Distinction between layout marking tools and machining hole-starting punches
Estimated Time:1m 0s
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Topics

Measuring and Layout Tools

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