Ruler

Ruler

Overview

A ruler is a rigid measuring instrument used in the picture framing, drafting, and art industries for accurately measuring distances and for drawing straight lines. Unlike flexible measuring tools such as tape measures, a ruler provides a stable and straight edge, making it particularly valuable for precise layout work, mat cutting, and determining artwork dimensions.

Function & Purpose

• Measuring: Provides accurate linear measurement, typically in inches, centimeters, or millimeters.
• Drafting: Serves as a straightedge for creating consistent, straight guidelines in matting and frame design.
• Quality Control: Used in the framing shop to verify artwork size, mat openings, and frame dimensions against specifications.
• Calibration: Ensures accuracy when aligning cutting tools, squaring moulding, or marking mounting boards.

Types of Rulers

• Wooden Rulers: Traditional and affordable, but may warp over time.
• Metal Rulers: Durable and precise, often preferred in professional framing and mat cutting.
• Plastic Rulers: Lightweight and transparent versions allow easy visibility of underlying artwork.
• Specialty Rulers: Variations such as cork-backed rulers (to prevent slipping) and T-squares (for right-angle accuracy) are common in art and framing work.

Advantages

• Provides precise, repeatable measurements.
• Can double as a cutting guide when working with knives or blades.
• Rigid structure ensures accuracy over flexible measuring tools.
• Portable and simple to use in both workshops and studios.

Limitations

• Limited length (typically 12-48 inches) compared to tape measures.
• Rigid form makes it less practical for measuring around curves or large objects.
• Wooden rulers can warp or wear, reducing accuracy.

Best Practices

• Use a metal ruler with a cork backing for precise cutting and measuring in frame shops.
• Pair with a tape measure for larger measurements and dimensional confirmation.
• Keep ruler edges clean and undamaged to preserve accuracy.
• Store flat to prevent warping or bending.

Related Terms

• United Inch
• Metric
• Tape Measure
• Out Of Square