Twisted off-center from the longitudinal axis by more than what percent?

Twisted off-center from the longitudinal axis by more than what percent?

• A. 15%
• B. 10%
• C. 5%
• D. 0%

Answer: (B)

Twist that moves a load off the crane’s straight, along-the-length axis creates sideways forces on the hoist and trolley. Those lateral forces push on bearings, gears, and wire rope unevenly, increasing wear, inducing sway, and raising the risk of misloads or tip-over. To keep things within safe operating limits, there’s a tolerance for how far off-center the load can be. The threshold given here is ten percent, so if the twist exceeds that, the alignment is considered unsafe and action is needed. For comparison, a smaller limit like five percent would be stricter than this standard; zero percent is ideal but not practical in real operations; and fifteen percent would be beyond the allowed safety margin, hence not acceptable.

Twist that moves a load off the crane’s straight, along-the-length axis creates sideways forces on the hoist and trolley. Those lateral forces push on bearings, gears, and wire rope unevenly, increasing wear, inducing sway, and raising the risk of misloads or tip-over. To keep things within safe operating limits, there’s a tolerance for how far off-center the load can be. The threshold given here is ten percent, so if the twist exceeds that, the alignment is considered unsafe and action is needed. For comparison, a smaller limit like five percent would be stricter than this standard; zero percent is ideal but not practical in real operations; and fifteen percent would be beyond the allowed safety margin, hence not acceptable.