Here's how we made a trailer hitch using tab & slot design + laser

200mW Slot Laser Light Infrared Scribe for Bridge Cutting Machine laser slot

In this study, we propose a new design of the commercial laser triangulation sensor modification extending the depth accessibility of side distance measurement

laser slot V-Tech two-slot expansion box for their Laser 128 Apple c clone I had one of these hooked to the first model of the Laser 128 back in 1987 or so  And yes, you would adjust the size of the slot to match the kerf of the laser and the material thickness  Laser 128 Expansion Slot · Add 2 External Slots to Laser128 · Can use Internal or External Power Supply · Build in LED to control All PCB voltage

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