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Difficulty: MediumChisels, Files, and Planes

A technician is preparing a piece of thick steel bar stock and needs to quickly remove a substantial amount of excess metal during rough shaping before final finishing. Which file tooth pattern should the technician select for the fastest, most aggressive cutting action?

  1. A
    Single-cut file
  2. Double-cut fileAnswer
  3. C
    Rasp-cut file
  4. D
    Curved-tooth file

Answer

Double-cut file
A double-cut file is manufactured with two intersecting series of diagonal teeth—the first cut (overcut) and a crossing second cut (upcut). This creates hundreds of individual diamond-shaped cutting points that penetrate deeply into steel and break metal chips into smaller particles, delivering the highest rate of material removal among standard metalworking files.

Step-by-Step Solution

1
Identify the task requirements and workpiece material
The operation involves heavy, rapid stock removal on a ferrous steel bar during rough shaping.
Choosing the proper hand file begins with matching the tool's tooth configuration to the required rate of material removal and material hardness.
2
Evaluate the cutting mechanics of available file tooth patterns
A double-cut file contains two crisscrossing sets of diagonal teeth (an overcut and an upcut) that create diamond-shaped cutting points, producing small broken chips and biting aggressively into metal.
Single-cut files produce continuous shavings and smooth finishes, rasps are meant for soft non-metals, and curved-tooth files are designed for soft non-ferrous metals.
3
Select the optimal file for rapid roughing
The double-cut file is the standard shop choice for fast, heavy metal removal.
Its crisscross tooth pattern maximizes stock removal per stroke on steel workpieces.

Key Concept

Selection of hand file tooth cuts based on material removal rate and workpiece material
Estimated Time:45s
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Topics

Chisels, Files, and Planes

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