Page 51 - CATALOGUE
P. 51
3. Critical Speed
When resonance occurs, the rotary speed is called critical speed. The critical speed depends on the
diameter of the screw, the type of end fixity and the free length L. No allowance must be made for
guidance by a nut without preload. The operating speed should not reach more than 80% of the
critical speed.
End fixity
Fixed Fixed
Fixed Floating
Floating Floating
Fixed Free
-1
n = critical speed (min )
-1
n k = permissible operating speed (min )
f = corrector value, determined by mounting
d 1 = root diameter (mm)
L = mounting distance (mm) (distance between bearings)
www.wy-sz.com 48
