CNC sheet metal bender - GIF

CNC sheet metal bender.

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Previously:

https://www.homemadetools.net/forum/...537#post212340
https://www.homemadetools.net/forum/...679#post209565
https://www.homemadetools.net/forum/...585#post225505
https://www.homemadetools.net/forum/...969#post194868
https://www.homemadetools.net/forum/...057#post191389

looks like dexion style metal shelves. I would love to know if the vacuum system has any sensors to tell if the sheet has moved since placement, or if the only reference is the initial placement against the fence/location pins.

How does it move?