Here is a set of articulated arm clamps I welded up. The material used was 1’ ball bearings, 3/8” plate, and ¾” round stock for the construction. 3/8” bolts to tighten each clamp when in position. I welded up different ends for either clamping to my table or the material I am going to weld. Bolts, Vice grips. And angle iron ends shown in the pictures.
Have fun
Tom

