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Compaction Terminology

Frequency is simply the number of times per minute that the eccentric shaft rotates within the drum. 4000 VPM means the shaft rotates 4000 times per minute or 67 times per second.

Centrifugal Force is the force generated, in pounds, by the eccentric weights rotating within the drum.

Nominal Amplitude is the vertical movement of the drum, in inches, created by the centrifugal force.

Comparison of Sakai Compaction to Others These dynamics typically increase the compacting force many times the actual static weight of the drum assembly while helping to reposition the material particles at the same time for a tighter fit.

Like shaking up a box of corn flakes, this vibration rapidly moves the material particles, reduces the air voids between them, increases the material contact points and thus speeds compaction in short, Sakai vibratory compactors increase density faster.

Vibratory compaction is a very technical process. For more detailed information, ask for a copy of Sakai’s book entitled "Compaction Equipment – Theory and Practice."