Final answer:
The difference between an overhung and straddle mount lies in the bearing placement in relation to the impeller or wheel, with overhung mounts placing the impeller outside the bearings and straddle mounts placing it between the bearings.
Step-by-step explanation:
The difference between an overhung and a straddle mount relates to the positioning of bearings in rotary equipment, such as pumps and motors. An overhung design features the impeller or wheel situated outside the bearings, which means that the impeller is mounted on the end of a shaft that extends from the supporting bearings. Conversely, with a straddle mount, the impeller or wheel is positioned between bearings, also known as between-the-bearings design. This design supports the impeller on both sides, providing more stability and reducing deflection caused by the load.
In physics, an overhung mount refers to a situation where an object or load is placed beyond the support point or pivot. This causes a lever arm to be created, resulting in a torque or turning effect. An example of overhung mount is a diving board, where the load (diver) is placed beyond the support point.
On the other hand, a straddle mount refers to a situation where an object or load is placed on both sides of the support point or pivot. This means that the load is balanced and exerts equal forces on both sides of the support. An example of straddle mount is a seesaw, where two people sit on opposite ends and the pivot point is located in the middle.
Each type of mount has its own advantages and disadvantages. Overhung designs are typically simpler and less expensive to manufacture, but they can allow more shaft deflection, possibly leading to increased wear and tear. Straddle mount designs provide better support, which can enhance the longevity and reliability of the equipment but generally at a higher manufacturing cost.