Recent Blogs
Proportional Dividers: Exact Similar-Triangle Scaling
How proportion compasses and hyperbola-drawing linkages work, with the geometry, real shop scenarios, and a worked example for pattern-makers and drafters.
Trolley Car: Overhead Supply and Steady DC Power Calculator
Explore overhead current collection and rail return. Calculate ideal steady input power and current from motor output, motor count, voltage and entered efficiency.
Eidograph Mechanism Explained: Parallel-Bar Drawing Copier, How It Works, Parts, Formula, Diagram
See how an eidograph’s equal pulleys, parallel arms and matched fulcrum position produce a scaled drawing. Compare copy length and area ratios.
Drawing Pantograph: Exact Homothetic Scale
Explore a rigid-link drawing pantograph. Calculate pencil-to-tracer scale, pencil-path length and ideal area scale from a reduction ratio.