A pulley could be caused to rotate by creating longitudinal vibrations in a cord that passes over the pulley. For little amplitudes and high frequencies, the motion of the cord is certainly too small to notice and the pulley appears to be spinning with no cause, creating a striking effect. Pulley rotations were observed for a variety of pulleys and cords; nearly any such system will work. The acceleration and path of the rotation depends on the various physical parameters of the system: vibration frequency and amplitude, cord pressure, and the radius and moment of inertia of the pulley.
Welded pulley:
While welded pulley is welded and machined parts parts into a whole, the machining and materials cost is high.
Spinning pulley:
Spinning pulley used stamping and spinning technology, during the production process, it 
really is formed simply by extruding the complete part material. These pulleys possess high production efficiency. Not merely can it save recycleables and cost, but also can be utilized longer because of its better wear-resisting and rust-proof. Today this pulley is usually well appreciated in the high-end market in the auto industry, kitchen appliances industry, machinery market ETC. We are haapy that you demand our mature and professional spinning technology.
V-belt Spinning Pulley, Metal Pulley, Split Pulley for Yard Mower
Product Details
Model Number:P100-42 10016
Brand Name:Renchi
Origin:China (mainland)
Key Specifications/Unique Features:
V-belt spinning pulley metal pulley split pulley for yard mower
Material: hot rolled steel plate
Thickness: 4.0mm
Out diameter: 122mm
Weight: 0.390kg
V-Belt type: SPB
Surface area treatment: zinc plated yellow
Primary Competitive Advantages:
Prompt Delivery
Quality Approvals
Service
Small Orders Accepted
Origin
Experienced Staff
Form A
Green Product
Price
Ever-power C339SP Get clamp with spinning pulley
The Ever-powerC339JS Grab Clamp with Spinning Pulley is flexible and fast, and thanks to its pincer jaw design can be affixed to a wider variance of round or square pipes, beams and bars than traditional clamps. It has a push-key lock for extra security and 3.9″ pulley for raising curtains or other articles in TV, video and photographic studios and theaters. The Grab Clamp will hold up to 331 lb.
PRODUCT HIGHLIGHTS
– Zinc-Plated Steel Construction
– 3.9″ Pulley
– Load Capacity: 331 lb / 150 kg
Ever-power Grab Clamp with 100mm Spinning Pulley
About Ever-powerGrab Clamp
The C339SP is fitted with a 100mm diameter pulley to provide a quick and robust hanging point for TV and theatre sceneries. The grab clamp has been made to be installed on an array of beams, pipes and bars, whether round, sq ., or rectangular in section. It requires no adapter – just open and clamp it.