Recent Blogs
Spirograph Mechanism Explained: Hypotrochoid and Epitrochoid Curves, Parts, Formula, and Uses
Spirograph explained — how the hypotrochoid gearing draws roulette curves, the math behind the patterns, and how draughtsmen and educators use them today.
Slotted Parallel Ruler Mechanism Explained: How It Works, Parts, Diagram, and Navigation Uses
Slotted parallel ruler explained — how the slot-and-pin geometry keeps drawn lines parallel, with worked examples for draughting, marine navigation and shipwrights.
Proportional Compasses Mechanism: How They Work, Parts, Ratio Formula & Uses Explained
Proportional Compasses scale drawings up or down with one slide adjustment. Learn the geometry, ratios, and real draughting uses from architects to model-makers.
Flexible Curve Scriber Mechanism Explained: Parts, How It Works, Diagram and Bending Formula
How a Flexible Curve Scriber traces irregular curves for naval architects, patternmakers and surveyors — bending mechanism, accuracy limits, and worked examples.
Dotting Instrument Mechanism: How the Toothed Wheel Sets Dot Pitch on Drafted Lines
How a dotting instrument works, why draughtsmen used it for dashed and dotted lines, and how to spec wheel pitch for archive restoration and cartography...