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  1. Modeling multiple cranes on a common (shared) runway is hard to do well. Still harder when you take into account acceleration, crane blocking, and good 3D animation. If you have encountered this problem, here is a solution. For standard bridge crane movement, we recommend the simpler Crane object in the Extras library. But if you need the underhung cranes with cabs moving between bays, read on... The Simio Crane Library is a collection of objects designed for modeling multiple cranes operating simultaneously in a bay. The library is provided as an example of complex material handling using the standard features of Simio. The Crane library may be used in conjunction with the Simio Standard Library, and Crane pickups are done using the standard TransferNode (e.g. the output side of a Server). Crane drop-offs can be done at either a BasicNode or TransferNode. The Crane Library can also be used with custom libraries as long as they support rider pickups using the standard transporter ride features. The Crane Library consists of objects representing the Bay, Bridge, Cab, Lift, and Crane (the end effecter that actually picks up and drops off the item). These objects are combined together to model multiple cranes moving in a single bay. The separation of objects in this way allows you to use your own symbol for each component. A Crane movement occurs by first rising up from the pickup node to a specified travel height, traveling laterally at that height, and then lowering down to the specified drop-off node. All travel is done through free space without the need to explicitly draw a network. The Crane library also fully supports independent acceleration/deceleration and the ability for one crane to cause another blocking crane to move out of the way. The above library file is now obsolete. Instead, download the library posted closest to the bottom topics. Like all Simio-provided libraries, this library is open so you can look at how it was built, learn from it, and subclass your own objects to improve them. But unlike our built-in libraries, this is not fully supported (although we can provide some help) and we may not continue enhancing it, particularly if we decide to build this capability into the base Simio products. We are anxious to receive your feedback on this library.
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