Question

In fitting, the file having rectangular cross section, tapered towards the tip both in width and thickness, double cut teeth on faces and single cut teeth on edges, is called:

• A. Hand file
• B. Flat file
• C. Pillar file
• D. Ward file

Hint:

The key to identifying a Flat file in a description is the word "Tapered." If the description says it tapers in both width and thickness, it is almost certainly a Flat file. If it stays the same width, it is a Hand file.

Answer 1

The Correct Option is B

Filing is a fundamental manual metal-removal process used in fitting shops to achieve precise dimensions and smooth finishes on workpieces. Files are categorized based on four distinct features: their length, their grade (roughness), the type of cut (teeth pattern), and their cross-sectional shape. 1. Defining the Flat File: The technical description provided in the question specifically defines the

Flat file. This is a general-purpose tool characterized by the following:

• Cross-Sectional Shape: It has a rectangular cross-section, meaning it is wider than it is thick.

• Tapering Geometry: Unlike some other files, the flat file is

tapered in both width and thickness towards its point (the tip). Typically, the first two-thirds of its length from the heel are parallel, while the final third tapers to allow the tool to enter smaller gaps.

• Teeth Arrangement: The broad flat surfaces (the faces) have double-cut teeth for efficient material removal, while the narrow sides (the edges) have single-cut teeth.

2. Distinction from the Hand File: This is the most common area of confusion. While both are rectangular:

• The

Hand file is parallel in width for its entire length (it does not taper in width).

• One edge of a hand file is typically a "safe edge" with no teeth, allowing the user to file one surface without damaging an adjacent vertical wall.

3. Summary of Use: Because of its dual-tapered shape, the Flat file is highly versatile for smoothing large flat surfaces and working in corners where a fully parallel file might be too bulky to maneuver.