Determination of unbalance-force K and static equivalent load F acc. DIN 4024 Part 1. The sum of all dynamic unbalance forces effecting on the upper surface of the machine foundation should result a vibration speed not higher than veff < 2.5 mm/s acc. to DIN ISO 10816 (depend on machine rating) for normal operation. In case of malfunction the vibration speed (acc .DIN 4024 Part 1 Chapter 5.4.4) should not be higher than veff < 38 mm/s. Operating Frequency: fm [Hz] = n/60 Natural Frequency: fn [Hz] = 61,5