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Difficulty: HardChisels, Files, and Planes

A technician is preparing the machined edge of a flat mild steel plate for a precision layout. After removing rough stock with a double-cut bastard file, deep cross-hatch scratches remain on the workpiece. Which tool and operating technique should be used to eliminate these surface scratches and produce a smooth, satin finish?

  1. A
    Draw a double-cut bastard file backward across the edge under heavy downward pressure
  2. B
    Angle a double-cut smooth file at 45 degrees while applying continuous pressure on both forward and reverse strokes
  3. Grasp a single-cut mill file with both hands and move it sideways along the workpiece using a draw-filing motionAnswer
  4. D
    Grip a coarse half-round rasp at both ends and push it across the flat metal edge in alternating directions

Answer

Grasping a single-cut mill file with both hands and moving it sideways along the workpiece in a draw-filing motion produces a smooth, satin finish by shearing metal cleanly without leaving cross-hatch tool marks.
Draw filing using a single-cut mill file is the standard shop procedure for creating a smooth, flat surface on metal edges. Because single-cut files have single rows of parallel teeth running diagonally across the blade, moving the file sideways along the edge shears away high spots and tool ridges smoothly without creating cross-hatch gouges.

Step-by-Step Solution

1
Identify the required surface finish and material characteristics
The workpiece requires removing rough cross-hatch marks on steel to create a flat, satin finish suitable for precision layout.
Rough stock removal with a coarse double-cut file leaves overlapping ridges that must be refined.
2
Select the appropriate file tooth configuration
Choose a single-cut mill file.
Single-cut files feature unbroken, parallel rows of teeth that provide a shearing cut, leaving a smooth surface rather than the diamond pattern left by double-cut files.
3
Determine the proper filing technique for surface finishing
Execute a draw-filing technique by holding the file flat at both ends and pushing or pulling it along the length of the edge.
Draw filing cuts across the tooth face sideways, preventing deep groove formation and shaving high spots to a uniform plane.

Key Concept

File Tooth Configuration and Draw-Filing Surface Finishing
Estimated Time:1m 0s
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Topics

Chisels, Files, and Planes

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