Sebastián Cañas avatar image
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Sebastián Cañas asked Jason Lightfoot edited

Problem stacking pallets in Rack

Hi all,

If I store boxes in a rack, it will fit properly considering x-y-z dimensions:


When I use Totes, it will do as well as with boxes:


This is not the case if I use pallets, it seems that the Rack is only considering the z height of the pallet and not the whole z height considering the products packed within it:


Is this a bug?


FlexSim 22.0.8
rackspalletbounding boxstack palletspallet contents
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1666133513062.png (502.6 KiB)
1666133598411.png (538.9 KiB)
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1 Answer

Jason Lightfoot avatar image
Jason Lightfoot answered Jason Lightfoot edited

The stacking doesn't consider the content of the item being stored - so totes only appear to stack correctly - if the contents exceed the tote dimensions that is not considered - it just uses the tote bounding box. It not a bug, it's more of an over-simplification which needs rectifying.

Attached is a model with a new pallet in the flow item bin that uses the simple packing method to stack inside, like the tote, and additionally changes the pallet bounding box size when you pack/unpack items (using the pallet's OnReceive and OnSend behaviors), while preserving the pallet visual.





Here's a library containing the pallet for easy loading into your model.


Here's an example of pallets being packed,stored, unpacked and re-stored in a rack based on the available space:


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Joerg Vogel avatar image Joerg Vogel commented ·

@Sebastián Cañas , please highlight a container item. You will notice, that a pallet is framed in its outer limits just like a tote. But a tote stores items inside and a pallet outside of this frame. If you stack such objects then stacking Methode evaluates just the dimension of those yellow frames.

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Sebastián Cañas avatar image Sebastián Cañas commented ·
Thanks @Jason Lightfoot for the explanation!
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Joerg Vogel avatar image Joerg Vogel commented ·
I discussed a dynamic pallet before, unfortunately such pallets behave a bit strange, if they are inside of a queue and their content changes or their height differ.
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Jason Lightfoot avatar image Jason Lightfoot ♦ Joerg Vogel commented ·

I think that issue is one of restacking without removing pallets - I don't think there are many examples where people take from a bottom pallet without removing the upper pallets.

Note this method doesn't use drawsurrogates or dummy objects - the pallet and item tree is exactly as you'd expect and can be virtualised and restored as any normal pallet.

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