Fixed Pulley centers : the center of each pulley does not move relative to the machine frame (Base-Part). It is the most common belt and pulley arrangement.
•The sketch-loop/path is a sketch-loop in the Base-Part.
•Each Pulley is a Part that is joined to the Base-Part with a Pin-Joint.
A Pulley Part can be a:
Linear Motion of Belt = Drive Pulley Radius x Drive Pulley Angular Motion
Angular Motion of Pulley = Linear Motion of Belt / Pulley Radius.
Pulleys that have 'Fixed-centers' rotate with their centers fixed to the Base-Part.
It is possible to have:
Pulleys and Fixed centers:
•Pulleys are Rotating-Parts, with Pin-Joints at the center-Points of the Arcs in the sketch-loop in the Base-Part
•Use the Pulley dialog-box to edit the Number-of-Teeth of each
•The Belt is a sketch-loop
•When the Pulleys are on fixed-centers, add the sketch-loop to the Base-Part
The Pulleys or the Belt move with a specified motion.
When the motion is specified for the:
•Belt: We use a Motion-Path FB to define the motion of a Motion-Point along the sketch-loop on the Base-Part. Then, the Pulley's motion comes from the Belt's motion.
•Pulley. The Pulley PArt is a kinematically-defined Part - for example, we can add a Motion-Dimension FB to define the rotation of the Pulley directly. Then, the Belt's motion comes from the Pulley's motion.