What is a combination square and what are its common uses?

A combination square is a versatile hand tool used for a variety of layout and measurement tasks. It consists of a graduated steel blade and one or more heads that slide and lock onto the blade. Common uses include marking 90 and 45-degree angles, measuring depth, checking for squareness, and scribing parallel lines. Sets like the Fowler High Precision Combination Square Set include a square head, protractor head, and center-finding head, expanding the tool's functionality.

How do I choose the right size combination square for my needs?

Combination squares are typically sized by the length of their blade. A 12-inch blade, like that found on the Stanley Proto Industrial Tools 12" Combination Square, is a common and versatile choice for general purpose work. Smaller blades (6-inch) offer greater portability and are useful in tight spaces. Larger blades (18-inch or 24-inch) are better suited for larger projects where greater reach is required. Consider the typical size of the materials you'll be working with when selecting a combination square.

What features should I look for in a quality combination square?

When selecting a combination square, look for a blade made of hardened steel with clear, easy-to-read graduations, preferably etched or laser-marked. The head should be made of a durable material like cast iron or machined steel and should lock securely onto the blade without play. A good locking mechanism is essential for accurate measurements. Some squares, like the Stanley Proto Industrial Tools Combination Square, feature both English and metric graduations for added versatility.

What is a squaring tram and when is it used?

A squaring tram is a tool used to measure the diagonal distances within a rectangular area to ensure it is square. They are commonly used in automotive body work to check the frame or body for squareness after a collision or repair. The Killer Tools Compact 21 Inch Squaring Tram, for example, is designed for the tighter spaces found in modern vehicles and allows for accurate comparison measurements to identify deviations from square.

How do I maintain a combination square to ensure accuracy?

To maintain the accuracy of your combination square, keep the blade and head clean and free from rust or debris. Wipe down the tool after each use and apply a light coat of oil to the blade to prevent corrosion. Store the square in a dry place, preferably in a case or tool chest, to protect it from damage. Periodically check the squareness of the head against a known square reference and make adjustments as needed. Replacement parts, like the Central Tools Combination Square Locknut Assembly, are available to repair worn components.

What are the differences between a combination square set and a standard combination square?

A standard combination square typically includes only the square head, which is used for 90-degree and 45-degree angles. A combination square set, such as the Fowler High Precision Combination Square Set, includes additional heads like a protractor head (for measuring angles) and a center-finding head (for locating the center of round stock). The set provides greater versatility for a wider range of layout and measurement tasks.

Are combination squares suitable for both woodworking and metalworking?

Yes, combination squares are suitable for both woodworking and metalworking. The hardened steel blade and durable head can withstand the demands of both applications. However, it's important to choose a square with clear, precise graduations for accurate measurements in either material. Some squares, like the Stanley Proto Industrial Tools Combination Square, feature both English and metric graduations, making them adaptable to different project requirements.

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Central Tools | 3S503 | Combination Square Set

Name: Combination Square Set
Brand: Central Tools
SKU: 128229
Price: 164.14 USD
Availability: InStock
Rating: 3 (1 reviews)

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12" Fully hardened and tempered steel blade
Graduated in 8ths, 16ths, 32nds, and 64ths
Includes centering head and protractor
Meets Fed. Spec. GGG-S-656D
Individual pieces: 3S501 - 12" Blade; 3S504 - Centering Head; 3S505 - Protractor; 3S507 - Square Head