Actuallt it was in a linear bearing.
You can asuume a 15" long tube left end locked with rigid clamps for 2" and a linear ball bearing in a ridid housing for 1.5". The distance between clamps and bearing is 1.5" so that the remaing overhang length is 10". Load applied at the right side extreem end.
I have a cantilevered ANSI 4130 steel tube 1.0” dia X .095” thk, with 10” overhang. I applied load and it failed at 1350 lbs. The failure is localized buckling not pure bending. I did the same test on .75” dia X .250” thk 4130 steel tube with same 10" long. It sustained up to 1800 lbs and the...