I have a large commercial sewing machine, a Singer 111W155. It has a base with the treadle, and a large motor. I would guess it weighs about 130#. The legs come down straight to big grommets that sit on the floor.
I want to put two pieces of half inch thick by three inch wide flat bar across the bases front to back, mount them to the bolts holding the grommets on, and have them extend out so I can put swivel casters on it to move the machine around better. This is going to improve the width so as to make it more stable, but not the length.
How much flex would be in the flat bar? The flat bar would extend past the current edges of the feet by about four inches. I think the flex would be minimal, and that it would hold, but wonder if I should weld on some diagonal brackets made out of simple rods. I could weld them on, but then it would be difficult if I ever want to remove the wheels. I could make them to bolt on, but that requires more work.
How much flex?
Steve