My partner and i started our business venture; Triumph Machine in Stow, Ohio. We needed a table to handle our industrial weldments, which often times use < 2'' steel, and our government projects. To start we used the Amada to cut the lengths of 3x3x.25w for the frame and legs of the table. We wanted each foot to be adjustable so that when put in place it can be leveled easily. I burned .375'' thick caps the size of the inside of the tube, these get welded flush inside the tube and have the grade 8 nuts welded to them. To get good penetration i put a very heavy bevel on the caps. There will be around 2500lbs on these welds with just the weight of the table itself. Next, to make the feet i burned eight 10'' diameters out it 1'' thick A36. My partner Cory counter bored the diameters on the lathe so that the 7/8'' bolts can be welded flush from the bottom up and it gives them a much cleaner appearance compared to welding them on top of the feet. I used a spare piece of tubing and a nut to hold the bolt up square in the bore. I also tightened the hell out of it so it didnt pull when it cooled from welding.