Drafting Compass Grand GR-C101 — Grand precision drawing compass, model GR-C101

Grand GR-C101 is a drafting compass designed for precise circle and arc drawing in technical drawing, drafting and schoolwork. The tool has an adjustable leg span and a fixed-point pivot that provides stable, reproducible circles and controlled radii. Its construction focuses on alignment and consistent performance to meet the needs of architects, engineers, students and hobbyists who require accurate geometry in sketches and plans.

Advantages

The Grand GR-C101 offers stable pivoting and fine adjustment of the leg span to achieve accurate radii. The fixed-point pivot reduces slippage during drawing, while the durable joint and calibrated adjustment allow repeatable measurements. The compass is compact and lightweight for convenient transport and storage without sacrificing rigidity needed for precise work.

Suitable for

• Technical drawing and drafting
• Architectural sketches and floor plans
• Engineering diagrams and detail drawings
• School geometry lessons and exams
• Hobby projects, model making and crafts

Key specifications

• Adjustable leg span for a range of circle radii
• Fixed-point pivot for stable drawing
• Fine adjustment mechanism for precise radius setting
• Lightweight yet rigid construction suitable for repeatable use
• Compact size for easy storage and transport

How to use

Set the compass legs to the desired span using the fine adjustment mechanism and place the fixed-point pivot at the circle center. Hold the pivot steady with light downward pressure and rotate the opposite leg with the pencil or lead to draw a smooth circle or arc. For best results, ensure the pencil lead is sharp and the pivot point is secure on the drawing surface. Adjust the span incrementally when transferring measured radii to avoid overshoot.

Usage recommendations

Use on a flat, stable drawing surface and check the pencil lead regularly to maintain a consistent line. For technical work, verify radii with a ruler or scale after setting the compass. Store the compass in a protective case or pouch to prevent bending of the legs and to preserve the adjustment mechanism.