A pulley can be caused to rotate by creating longitudinal vibrations in a cord that passes over the pulley. For little amplitudes and high frequencies, the movement of the cord can be too small to notice and the pulley seems to be spinning with no cause, creating a striking effect. Pulley rotations were observed for a variety of pulleys and cords; nearly any such program will work. The speed and direction of the rotation depends on the various physical parameters of the system: vibration frequency and amplitude, cord tension, and the radius and second of inertia of the pulley.
Welded pulley:
While welded pulley is welded and machined parts pieces right into a whole, the machining and 
materials cost is high.
Spinning pulley:
Spinning pulley followed stamping and spinning technology, through 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 cost, but also can be utilized longer for its better wear-resisting and rust-proof. Right now this pulley is usually well loved in the high-end marketplace in the auto sector, home appliances industry, machinery market 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/Particular Features:
V-belt spinning pulley steel pulley split pulley for yard mower
Material: scorching 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 Get Clamp with Spinning Pulley is flexible and fast, and because of its pincer jaw design could be affixed to a wider variety of round or square pipes, beams and pubs than traditional clamps. It has a push-button lock for extra protection and 3.9″ pulley for raising curtains or other articles in TV, video and photographic studios and theaters. The Get Clamp will hold up 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 designed to be installed on an array of beams, pipes and bars, whether round, sq ., or rectangular in section. It needs no adapter – just open and clamp it.