When you receive a base unit and blank bowl, the unit has been factory tuned.  It is generally over-sprung to allow for the addition of tooling and to provide a more stable amplitude if heavy parts are put into the bowl. If the weight of the bowl is increased too much, however, additional springs will be needed on the base unit.

To check the springing required after the weight is added, turn the unit on and loosen one spring bolt.  If the bowl amplitude decreases, springs should be added;  if it increases, spring should be removed.  Springs should be added or removed in small increments.  Try to keep the springing as even as possible.

When changing springs it is very important that the springs be TIGHTENED SECURELY. 5/6" bolts should have a torque of up to 30 ft. lbs., 1/2" bolts up to 100ft. lbs., 5/8" bolts up to 200ft. lbs, and 3/4" bolts 400ft. lbs.  Bolts should have a fastening depth of approximately twice their diameter.


Spring clamps (thick washers) must be used under the head of spring bolts.

Spring spacers must be used between the springs and against the fastening surfaces.

The armature air gap should be between  .015" and  .040" for "B" Series drives. For other drives consult PFI.

The proper controller must be used.

The neoprene feet must be attached securely.

The bowl mounting bolts must be tight. (Torque should be approximately 1/4 that of the spring bolts).

Nothing should restrict the bowl from vibrating

The stand for the feeder should be level and vibration free.

Things which rarely occur, but should be checked if the unit is still malfunctioning are broken springs or a burned out coil.


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