pic: What is that black goo ?

[Gdeaver]

That black goo is System 3 epoxy and 1/2" chopped carbon fiber. I posted this to give an example of how to join the fiberglass pultrusions. I've seen allot of that green and Gray stuff on robots this year. The problem is most teams are using real thick heavy pultrusions. They use fastening techniques that are common for metal. The item in the picture Is our ball lift fork. Both pieces are 1/8" wall 2 and 1 ". 2 holes were cut in the 2 " piece and the 1"" piece slide through extending 1/4" on the back side. A 1/4" piece of wood was inserted in the 2" to form a cavity to epoxy. Believe me that joint is very strong. Other parts of the pultrusion would fail before the joint. Hope fully this will inspire other teams to think of other uses for pultrustion. Our entire arm will be made of them. All made with common hand tools. No fancy CNC.