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Multi-axis, Multi-link Spatial Mechanisms
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Machine uses multi-axis and multi-link spatial mechanisms to push in X,Y,Z directions
Here is a 'Do Nothing Machine'. It just pushes a block around a 3D path.
The key design requirement is to minimize the impact velocities between the pusher tools and the product while keeping the accelerations to a minimum.
In this case, we are using the spatial mechanism capability of MechDesigner. There are two cam shafts driving a total six axes. the six axes comprise :
- two in the X direction, +X, -X
- two in the Y direction, +Y, -Y
- two in the Z direction, +Z, -Z
However, all the followers are pivoting about the axes parallel to the Z-axis. A common technique to get the pushers moving in the Z direction is to use ball joints on a bell crank.
As you change design parameters, e.g links length, motion node positions, the cam profiles are continually updated, so you immediately know if the change you have just made has increased cam pressure angle, or causes the cam to undercut for example.