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 movement of the cord is usually too small to notice and the pulley seems to be spinning with no cause, creating a impressive impact. Pulley rotations were observed for a number of pulleys and cords; almost any such system will work. The swiftness and direction of the rotation depends upon the various physical parameters of the system: vibration frequency and amplitude, cord tension, 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 material cost is high.
Spinning pulley:
Spinning pulley followed stamping and spinning technology, through the production process, it really is formed by extruding the whole part materials. These pulleys possess high production efficiency. Not only can it save recycleables and price, but also can be utilized longer because of its better wear-resisting and rust-proof. Now this pulley is certainly well loved in the high-end marketplace 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, Metal 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: incredibly 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 Grab clamp with spinning pulley
The Ever-powerC339JS Grab Clamp with Spinning Pulley is flexible and fast, and thanks to its pincer jaw design could 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 safety 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 offer a quick and robust hanging point for TV and theatre sceneries. The get clamp has been made to be installed on an array of beams, pipes and bars, whether round, square, or rectangular in section. It needs no adapter – just open and clamp it.