ALVIN PA308, Wood Pantograph Drawing Tool with Table Clamp and Four Spare Leads - 24 Inches, 30 Ratios

Some high-speed rail systems are powered by electricity supplied to a pantograph on the train's roof from a catenary overhead, as shown in Figure Pl.9. The force applied by the pantograph to the catenary is regulated to avoid loss of contact due to excessive transient motion. A proposed method to regulate the force uses a closed-loop feedback system, whereby a force, Fup , is applied to the botom of the pantograph, resulting in an output force applied to the cateriary at the top. The contact bet

Motorized Draw Bench Machine

MIT has developed a drone that mimics what you draw