## Spherical Geneva Mechanism

Spherical Geneva mechanism is a type of intermittent motion mechanism. It translates a continuous rotation into intermittent rotary motion. The driver and the driven wheels are on perpendicular shafts. The rotating drive wheel has a pin that reaches into a

## Difference between a machine and a structure

Before we go through the difference between a machine and a structure, let’s first see what they are. Once we comprehend that, understanding the difference between them will be a cakewalk for us. Machine: A machine typically contains mechanisms that

## Linear Geneva Mechanism

Linear Geneva mechanism is a type of intermittent motion mechanism. It translates a continuous rotation into intermittent linear motion. The crank (driver) has a pin that reaches into a slot of the slider. The driver wheel has a raised circular

A deltoid linkage is a four bar mechanism which consists of two pairs of equal and adjacent links. It is a grashof linkage for which the sum of the lengths of the shortest link and the longest link is equal

## Grashof’s Law

Consider this four bar mechanism: s = length of the shortest link l = length of the largest link p and q = lengths of the other two links By Grashof law, for at least one link to be capable

## What is a Kinematic Joint?

A kinematic joint is a connection between two or more links, which allows some motion, or potential motion, between the connected links.  Depending upon the number of links at the joint, a joint can be binary, ternary or quaternary. The

## Links, Joints, and Kinematic Pairs

Links: A link, is an (assumed) rigid body which possesses at least two nodes which are points for attachment to other links. Binary Link: This link has two nodes. Ternary Link: This link has three nodes. Quaternary Link: This link has four nodes. Joints: A

## Velocity Analysis – Slider Crank Mechanism (Graphical Method)

Consider a slider crank mechanism as shown: > The crank OA is moving with uniform angular velocity ω radians/second in the counter-clockwise direction. > At point B, the slider moves on the fixed guide G. > AB is the coupler joining A and B. We

## Ratchet and Pawl Mechanism

Ratchet and Pawl mechanism is a type of intermittent motion mechanism. It allows the rotation of the shaft in one direction only and prevents its motion in the other direction. It consists of an arm that pivots about the center

## Double Crank Mechanism

Double Crank Mechanism is a four bar linkage. In this linkage, both the links pivoted to the fixed link rotates fully. It is a Grashof linkage for which the sum of the lengths of the shortest link and the largest