Drawing Compass Pelikan Cyrkiel RK – precision compass for circles and arcs

Pelikan Cyrkiel RK – precision compass for circles and arcs is a mechanical drawing instrument engineered for accurate construction of circles and arcs in technical drawing, school geometry and drafting. The compass features a stable pivot point and an adjustable arm that enables precise setting of radii. It accepts standard leads or a replacement needle, offering consistent performance for repeated measurements and constructions.

Advantages

The design combines a rigid hinge and fine adjustment mechanism to minimise play and maintain the selected radius during use. Materials and joint tolerances are selected to provide reliable alignment of the lead and pivot, ensuring reproducible results when drawing multiple concentric circles or transferring measurements. The option to use standard leads or a needle improves versatility for different media and line thicknesses.

Suitable for

• School geometry classes and student assignments
• Technical drawing and drafting tasks
• Architectural and design sketching that requires precise circles
• Repetitive geometric constructions and measurements

Key specifications

• Type: precision drawing compass for circles and arcs
• Adjustment: fine adjustment mechanism for accurate radius setting
• Point options: accepts standard pencil leads or a replaceable needle
• Pivot: stable pivot design to reduce slippage during drawing
• Intended use: manual drafting, school use, design and architectural sketches

How to use

Place the pivot point securely at the center of the intended circle and set the radius by moving the adjustable arm until the desired distance between pivot and lead is achieved. Use the fine adjustment to refine the radius, then rotate the compass smoothly around the pivot with steady pressure to produce an even circle or arc. Replace the lead or install the needle as needed for different line widths or drawing surfaces. Check alignment and retighten the hinge if the radius changes during use.

Usage recommendations

For best results, use on a flat, stable drawing surface and keep the pivot point clean to avoid slipping. Choose a lead hardness appropriate to the drawing medium: softer leads for darker lines, harder leads for precise, faint construction lines. Store the compass in a protective case or sleeve to preserve joint accuracy and prevent damage to the needle or lead.