Recent Blogs
Watt Parallel Motion
Watt Parallel Motion explained — how James Watt's three-bar linkage guides a piston rod in a near-straight line for steam engines, indicators, and suspensions.
Parallel Ruler (form 6)
Form 6 Parallel Ruler explained — how the four-bar linkage keeps the straightedge parallel during translation, with worked numbers for drafting and marine chart work.
Parallel Ruler (form 2)
Parallel Ruler form 2 explained — how the four-bar linkage holds true parallel motion across a drafting board, with formulas, tolerances, and worked examples.
Rack Gear Parallel Motion
Rack gear parallel motion guides a steam piston rod in a straight line using a rack, pinion and counter-rack. See the geometry, math and a...