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 movement of the cord is definitely too small to note and the pulley appears to be spinning without cause, creating a impressive effect. Pulley rotations were observed for a number of pulleys and cords; nearly any such system will work. The quickness and direction of the rotation depends upon the various physical parameters of the machine: vibration frequency and amplitude, cord stress, and the radius and second of inertia of the pulley.
Welded pulley:
While welded pulley is welded and machined parts items right into a whole, the machining and materials cost is high.

Spinning pulley:
Spinning pulley used stamping and spinning technology, through the production process, it really is formed simply by extruding the complete part material. These pulleys have high production efficiency. Not only can it save recycleables and cost, but also can be used longer for its better wear-resisting and rust-proof. Today this pulley is definitely well loved in the high-end marketplace in the auto industry, home appliances industry, machinery sector ETC. We are haapy that you ask for our mature and professional spinning technology.

V-belt Spinning Pulley, Metal Pulley, Split Pulley for Lawn Mower
Product Details
Model Number:P100-42 10016
Brand Name:Renchi
Origin:China (mainland)
Key Specifications/Special Features:
V-belt spinning pulley metal pulley split pulley for yard mower
Material: sizzling 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 Get Clamp with Spinning Pulley is flexible and fast, and because of its pincer jaw design can be affixed to a wider variety of round or sq . pipes, beams and pubs than traditional clamps. It includes 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 hold up to 331 lb.
PRODUCT HIGHLIGHTS
– Zinc-Plated Steel Construction
– 3.9″ Pulley
– Load Capability: 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 grab clamp has been designed to be mounted on a wide range of beams, pipes and bars, whether round, square, or rectangular in section. It requires no adapter – just open and clamp it.