muddstopper
Veteran Member
Been trying to figure out how much weight I can lift using 4x4x0.250 sq tube. All those online calcultors and formulas just confuse me so I will ask here.
The tube is going to be used as the root boom of a knuckleboom loader. Tube will be 8ft long with a fixed pin at one end and cylinder attachment point approx, 49in from the fixed pin. The other end of the boom will have another 8ft piece of tubing (dipper boom) attached with pins with one end of the cylinder attached somewhere between the 49in clyinder location of the first boom and then attached to the outer boom. Max weight my rotator will handle is 4400lbs, altho I expect less than half that max load at any given time, but that weight could be suspended at the end of the 16ft long boom. With the load weight at full extention I am afraid I might bend the root boom at the cylinder mount location. Bascily what I need to know is just how much weight can a 4x4x0.250 sq tube support at a 4ft extention from middle of the tube. . I have a drawing, but cant figure out how to get it to post from autocad.
The tube is going to be used as the root boom of a knuckleboom loader. Tube will be 8ft long with a fixed pin at one end and cylinder attachment point approx, 49in from the fixed pin. The other end of the boom will have another 8ft piece of tubing (dipper boom) attached with pins with one end of the cylinder attached somewhere between the 49in clyinder location of the first boom and then attached to the outer boom. Max weight my rotator will handle is 4400lbs, altho I expect less than half that max load at any given time, but that weight could be suspended at the end of the 16ft long boom. With the load weight at full extention I am afraid I might bend the root boom at the cylinder mount location. Bascily what I need to know is just how much weight can a 4x4x0.250 sq tube support at a 4ft extention from middle of the tube. . I have a drawing, but cant figure out how to get it to post from autocad.