pic: REV Robotics building system

[mman1506]

Originally Posted by Mike Marandola

I love the fact that you can use standard hardware with this. I might be missing something obvious, but what are the grooves in the corners meant for.

According to their FB

All 5 holes on the end of each profile are designed to be tapped the same thread pitch as the hardware used in the slot. 10-32 for the 1" and M3 for the 15mm profile.

One of the reasons for the extra end tap holes is so your cross members wont have the ability rotate when you use the extrusion as a spanner between 2 plates.