Bow compass Dedra MC1050 — single-piece drawing compass for circles and arcs

Dedra MC1050 bow compass is a single-piece drawing instrument designed for accurately drawing circles and arcs. Supplied as one unit, this compass provides a fixed pivot and adjustable span suitable for technical drawing, drafting and school geometry. Its compact, straightforward design makes it practical for classroom use, homework, basic design tasks and general-purpose sketching where a manual compass is required.

Advantages

The single-piece construction ensures stable alignment between the pivot and the drawing point, reducing play and improving repeatability when tracing circles and arcs. Its compact size and uncomplicated mechanism make it easy to carry and set up quickly, while the fixed pivot delivers consistent center placement. The tool is compatible with standard pencil leads and can be used on a variety of paper types for precise manual drafting and geometry exercises.

Suitable for

• School geometry lessons and exercises
• Basic technical drawing and drafting tasks
• Quick sketches and layout marking
• Hobby projects requiring simple circular measurements

Key specifications

• Type: single-piece bow compass for circles and arcs
• Material: durable metal and plastic components for steady use
• Adjustable span: manual adjustment for variable circle diameters
• Pivot style: fixed pivot point for stable center positioning
• Compatibility: accepts standard pencil leads or graphite refills
• Use surface: suitable for paper, cardstock and typical drafting media

How to use

Place the pivot point at the intended circle center and set the drawing point to the required radius by adjusting the span. Hold the top of the compass steady and rotate the instrument smoothly around the pivot so the drawing point traces a continuous arc or full circle. Replace the pencil lead or sharpen as needed to maintain a clear line. For smaller adjustments, make fine span changes while keeping the pivot anchored to avoid shifting the center.

Usage recommendations

Use on a flat, stable surface and secure the paper to prevent slipping. For precise technical work, use a sharp pencil lead and check the pivot for wear; replace or tighten components if movement appears. Store the compass in a protective case or compartment to protect the pivot point and drawing tip.