Pulleys and Speed A smaller pulley turning a larger pulley results in the larger one moving more slowly but with more shaft power. Alternatively, a larger pulley turning a smaller pulley results in the smaller one turning faster but with less shaft power.

The Math of Pulley Sizing There are complicated formulas for determining pulley ratios but in generic, layman terms, simply divide the driven component (pump) by RPM, the driver component (motor or engine) rated by RPM to get the required ratio.

A larger diameter pulley wheel (aka sheave) is technically more efficient than a smaller diameter pulley. For example, in a 1:1 haul, you gain about 7% efficiency going from a 1.5” pulley to a 3.75” pulley. This efficiency increases with really big loads (600 lbs+) and larger mechanical advantage, such as 6:1 and 9:1.

Place your pulley face down on a flat surface, then put your ruler or caliper on top, measure from outside edge to outside edge across the circle of the pulley. Check carefully to make sure you are measuring across the center.

1. At first based on amount of power to be transmitted , select the type of belt.
2. Calculate design power. Design power =
3. Pitch length =
4. Note inside length.
5. Determine Belt rating.
6. Design no of belts =
7. Correct the center Length.
8. Also determine parameters of V groove pulleys using Manufactures data. Prev Page. Related Topics.

To increase blower speed, slightly loosen the setscrew that holds the pulley to the driveshaft. Move or turn the pulley clockwise on the shaft one turn, then tighten setscrew. If more speed is desired, turn the pulley clockwise two turns.

In pulley system B if the effort on the right hand rope is pulled down 1m then 1 m of rope must come over the top pulley. This means that EACH of the ropes holding the bottom pulley must shorten by ½ m and so the load rises ½ m. This means that the velocity ratio of our pulley system is 2.

Well, pulleys help us by changing the direction of the force we use to lift an object. The real mechanical advantage of a pulley is in using many pulleys at once. Using multiple pulleys decreases the amount of force necessary to move an object by increasing the amount of rope used to raise the object.

Pulleys are simple machines in the form of a wheel mounted on a fixed axis and supported by a frame. The wheel, or disk, is normally grooved to accommodate a rope. The wheel is sometimes referred to as a “sheave” (sometimes “sheaf”). The frame that supports the wheel is called a block.

Forklift

There are four main types of elevators: hydraulic, traction, machine-room-less, and vacuum.

• Geared and Gearless Traction Elevator. Geared and Gearless Traction elevators can be separated into three different categories:
• Hydraulic Elevator.
• Machine-Room-Less (MRL) Elevator.
• Vacuum (Air Driven) Home Elevator.