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Fixed Pulley Centres : the centre of each pulley does not move relative to the machine frame [Base-Part]. It is the most common belt and pulley arrangement.
Thus:
| • | 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:
| • | Drive Pulley
The Drive Pulley is kinematically-defined [Green Part-Outline] before you use .
The DriveR Pulley rotates to move the Belt. |
Linear Motion of Belt =
Drive Pulley Radius x Drive Pulley Angular Motion
| • | Driven Pulley
The Driven Pulley is not kinematically-defined [Blue Part-Outline] before you do .
The Driven Pulley is rotated by the Belt. It becomes kinematically when you do . |
Angular Motion of Pulley =
Linear Motion of Belt / Pulley Radius.
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When Pulleys have Fixed Centres, the:
Pulleys
| • | Pulleys are , with Pin-Joints at the centre-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 with the |
Belt
| • | The 'Belt' is a sketch-loop |
| • | When the Pulleys are on fixed-centres, add the sketch-loop to the |
Motion
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. We use a Motion-Dimension FB to define the rotation of the Pulley. Then, the Belt's motion comes from the Pulley's motion. |
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