A pulley can be caused to rotate by 
creating longitudinal vibrations in a cord that passes over the pulley. For small amplitudes and high frequencies, the motion of the cord is certainly too small to note and the pulley appears to be spinning without cause, creating a impressive impact. 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 upon the various physical parameters of the system: vibration frequency and amplitude, cord tension, and the radius and instant of inertia of the pulley.
Welded pulley:
While welded pulley is welded and machined parts pieces into a whole, the machining and material cost is high.
Spinning pulley:
Spinning pulley adopted stamping and spinning technology, during the production process, it is formed by extruding the complete part materials. These pulleys have high production efficiency. Not only can it save raw materials and price, but also can be used longer because of its better wear-resisting and rust-proof. Right now this pulley is certainly well enjoyed in the high-end market in the auto market, home appliances industry, machinery sector ETC. We are haapy that you demand our mature and professional spinning technology.
V-belt Spinning Pulley, Steel 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 steel 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 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 Get Clamp with Spinning Pulley is flexible and fast, and because of its pincer jaw design could be affixed to a wider variance of round or square pipes, beams and pubs than traditional clamps. It has a push-key lock for extra security and 3.9″ pulley for raising drapes or other articles in TV, video and photographic studios and theaters. The Grab Clamp will endure to 331 lb.
PRODUCT HIGHLIGHTS
– Zinc-Plated Steel Construction
– 3.9″ Pulley
– Load Capacity: 331 lb / 150 kg
Ever-power Get 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 get clamp has been made to be installed on a wide range of beams, pipes and bars, whether round, sq ., or rectangular in section. It requires no adapter – just open up and clamp it.