How to join t-slot profile with a Standard Nut and Bolt connection

How to join t-slot profile with a Standard Nut and Bolt connection t slot extruded aluminum Product Description Aluminum extruded bar for structural framing systems Price is $ per inch Need more than 8 feet? Please contact us to order trimble dual slot battery charger manual Explore the different factory and manufacturing solutions that can be built using's mk's t-slot aluminum extrusion Includes guards and workstations

trimble dual slot battery charger manual My question is - why use expensive extruded aluminum T-slot? I mean, for a CNC router it makes sense because you need sub-millimeter

the lion slot 45mm X 45mm T Slot Aluminium Extrusion Profiles · UsageApplication: Industrial · Shape: T-Profile · Dimensions: 45mm x 45mm · Material Grade: 6063 · Material: T Slot Aluminium Profiles and Accessories,for machine frames, CNC Machines, conveyors, workstations, simulators, van fit-outs, roof racks, clean rooms