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
See a slotted parallel ruler move and explore a separate clearance-angle and transverse-drift calculation.
Proportional Compasses: Exact Pivot Setting and Scale Transfer
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: Drawing Guide and Elastic Comparison | FIRGELLI
Learn how a flexible drawing guide follows a contour. Compare ideal elastic bending moment and entered radii without predicting permanent set or damage.