A pulley could 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 definitely too small to note and the pulley appears to be spinning with no cause, creating a impressive effect. Pulley rotations were observed for a number of pulleys and cords; nearly any such program will work. The swiftness and direction of the rotation depends on the various physical parameters of the machine: 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 pieces right into a whole, the machining and material cost is high.
Spinning pulley:
Spinning pulley used stamping and spinning technology, during the production process, it is formed simply by extruding the whole part material. These pulleys possess high production efficiency. Not merely can it save raw materials and cost, 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 industry, home appliances industry, machinery industry ETC. We are haapy that you request our mature and professional spinning technology.
V-belt Spinning Pulley, Steel Pulley, Split Pulley for Lawn 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 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 includes 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 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 designed to be installed on a wide variety of beams, pipes and bars, whether round, sq ., or rectangular in section. It needs no adapter – just open and clamp it.