Wobbler Feeders

Wobbler Feeders provide two functions in one unit: feeding material at a controlled rate, and scalping out the fines from the feed material.


Wobbler Feeders are especially good with wet, sticky materials where fines need to be scalped or are stuck to larger lumps. They also work well for scalping out materials with high percentages of clay. McLanahan Wobbler Feeders can be used to feed and scalp material in aggregate and mineral processing applications.

Wobbler Feeders are used in aggregate and mining applications to sort the run-of-mine material before the primary crusher. This scalping of the feed reduces unnecessary wear on the primary crusher. Since scalping the feed reduces the amount of material going into the primary crusher, it also reduces the required size and capacity of the crusher needed.

The Wobbler Feeder is especially useful for scalping fines that stick to the larger lumps of material. When a producer wants to remove these sticky fines from the larger material before a crusher, the Wobbler Feeder is the product of choice. The producer may want to remove these fines to reduce wear on the crusher or reduce crusher size, or because the undersize or oversize is an unwanted material contaminating the desired material.

The Wobbler Feeder is a good choice to remove unwanted oversize in materials, such as reclaiming soil from unwanted items like rock, concrete or stumps.

How Wobbler Feeders Work

The Wobbler Feeder consists of a frame, elliptical bars and a chain drive system used to rotate the bars. The bars are elliptical in shape and are timed at 90 degrees to the adjoining bar. The drive system connects all the bars with a double- or triple-strand chain that attaches to sprockets on each bar, maintaining the 90 degree timing. This maintains the gap, or opening, between the bars at the same dimension throughout the bar rotation. As material is moved from the feed end to the discharge end, the large lumps of material are forced up and down within the load, scrubbing against each other. This action forces any sticky material, such as clay, to be dislodged and enables it to pass through the openings between the bars. The rotation of the bars also moves the material from the feed end to the discharge end with continuous scrubbing the full distance.

Why McLanahan Wobbler Feeders

The history of the McLanahan Wobbler Feeder dates back to the beginning of the patented design conceptualized by National Iron Company. Decades later, hundreds of feeders still operating in the field attest to this product's design and reliability. Other companies produce similar products that are not designed to generate the scrubbing action, which cleans sticky fines from larger lumps, as the McLanahan Wobbler Feeder does. Bars on the Mclanahan Wobbler Feeder are manufactured from cast wear metal, providing a much longer service life than plate style bars.

Frequently Asked Questions About Wobbler Feeders

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The Wobbler Feeder is selected with a similar calculation as sizing a Vibratory Screen. The amount of undersize to pass the opening, the bar gap opening size, the total available opening square foot area and other information is used to select the correct Wobbler Feeder for the application.

This is not a recommended installation. Declining the Wobbler Feeder reduces the amount of oil in the chain case, which is the area used to cool the oil.

The capacity limitations of a Wobbler Feeder are dependent on the amount of material required to pass the opening and the amount of power required to perform this task.

Wobbler Feeders are calculated and configured out of standard components for each application. The application the Wobbler Feeder is required to perform is calculated, which determines the size, width and amount of bars needed for the application. This ensures the performance and reliability for which Wobbler Feeders are known.

Wobbler Feeders are used for feeding material at a controlled rate and scalping out the fines from the feed material.

Features & Benefits
  • Bars are self-cleaning
  • Material can be dumped directly onto the feed end, which is under a hopper, to provide a load that enhances the scrubbing or cleaning action needed to remove sticky fines
  • Can be fed by an Apron Feeder to serve as a scalper before a crusher
  • Wobblers are manufactured with a common lubrication point, reducing downtime while greasing numerous bearings
  • A standard auto-lubrication system on the Wobbler Feeder ensures the numerous bearings are adequately lubricated at all times
  • Rotation speed of the bars can be variable with the use of a variable frequency controller on the drive motor
  • For extreme applications, optional solid bars are available

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