Designing Valve Gearing

amount equal amount of lead ascertain Bisect brought into gear central position centre line closes the port connecting rod crank reaches crossed rods curve of centres cutting the line cylinder dead-point describe a circle describe an arc describe arcs intersecting describe the arc describe the circle distance divides the line eccentric rod EXPANSION GEAR expansion sheave find the point find the throw full gear given amount given position intersecting the line Join length line A B link-motion main valve circle main valve eccentric motion open an amount open rods parallel point E point F point of cut-off position relative Problem proportion radius equal radius rod radius vector reaches the position real position represent the position represent the throw required to find right angles single virtual eccentric slider steam-chest steam-port straight line throw and position triangle valve eccentric sheave valve gear valve-spindle velocity virtual eccentric arm