Why is the speed reduced on the DGE-SP axis?
As with all rotating shafts, the bending critical speed is the crucial criterion for length restriction on the DGE-SP axes. With very long spindles subject to high axial force, the buckling load can also be critical in certain cases. The bending critical speed is the speed at which the spindle executes its initial oscillation. The oscillation amplitudes are very high around the resonant frequency, which causes damage to the ball screw. This results in ‘inconvenient’ vibration noise. At a reduced speed, extra long strokes can also be made.
