Peterson Corp. News


Chipper Grate

Peterson's drum chipper grate system provides ultra-consistent chip sizing; twigs and small stems which can be difficult to size are easily fractured through our innovative system. The chipper grate is located next to the chipper drum and ensures that materials …

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UHMW

UHMW (Ultra-high-molecular-weight polyethylene) is an extremely tough plastic which is up to 15 times more resistant to abrasion than carbon steel. It has very low moisture absorption, is self-lubricating and allows for very little friction. Peterson uses UHMW for wear liners in many …

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Wear Liner

Replaceable plates made of UHMW which are designed to protect areas of the machines that are particularly prone to wear, to prolong their lifespan.

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Chain Curtain

The Chain Curtain is positioned behind the grinding chamber, but above the debris belt. As some ground material can travel through the grates at a high velocity, the Chain Curtain is designed to slow down ground material to stop if from …

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Hammer

The hammer is the bit holder and bit assembly, which includes the bit spacer. The hammer strikes against the anvil, breaking material up. The bit holder can be referred to as the hammer without referring to the whole assembly.  A series …

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Wear Block

The wear block is a replaceable steel block welded on a drum rotor in front of each bit holder to protect them from wear.

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Breaker Bars

Breaker Bars are chromium steel strips welded to the inside face of a grate which act as a anvils, assisting in the breakup of feedstock.

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Grate

A grate is a rectangular piece of steel that contains a pattern of holes which helps size feed material and allows it to pass from the grinding chamber to the discharge belt. After the holes are cut into the steel, the …

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Grate Opening

The grate opening refers to the hole size and hole shape that is cut into a steel grate. The grate opening allows material to exit the grinding mill onto the discharge conveyor. Grate hole sizes can be as small as 5/8" (1.5875 …

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Carbide Overlay

An overlay is a process that bonds one or more metals to a base metal via welding. In the case of a grinding bit, the steel forging is the base metal and the overlay that is applied to the forging consists …

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Anvil

The anvil is a long steel bar with beveled cutting edges and plays an integral part in the Peterson 3-stage product sizing process. Located at the top and just to the rear in the grinding chamber, the anvil is contacted by the …

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Sharp Edge Bit

A Sharp Edge Bit is a carbide overlay bit with tall, sharp cutting edges.  This bit cuts through dense, woody material efficiently and with less energy than a more blunt edge bit saving fuel and increasing production.

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High Abrasion Bit

The Peterson High Abrasion bit utilizes a cast carbide technology for maximum service life in the most extreme applications. The entire face of the bit is embedded with abrasion resistant carbide particles and the corners of the forging are reinforced with …

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Grate Position

Grate position refers to the order in which the grates are installed in the grinding mill. On a Peterson machine, the first grate is attached to the anvil housing and is referred to as the #1 position.  The #2 position is …

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ASG Breaker Grate

The ASG Breaker Grate is a specific type of Peterson anvil breaker grate used specifically for asphalt shingle grinding. The breaker grate has chromium steel breaker bars welded to the inside face which helps break up material more efficiently with this …

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Standard 6-Pass Carbide Overlay Bit

The Standard 6-Pass bit is a carbide overlay bit with 6 passes of carbide protection on the forging.  All four cutting edges along with two passes on either side of the forging make up the 6 passes of carbide protection on this grinder …

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Tiger Tooth Bit

The Tiger Tooth bit is a carbide overlay bit similar to the Sharp Edge Bit but with the cutting edge notched in the middle creating two tall carbide overlay "teeth" on either end of the forging. These "teeth" can efficiently penetrate …

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Feed Chain

The feed chain is the box chain used in the grinder's hopper acting as the feed conveyor. This chain is sometimes also called the feed chain or box chain.

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Knife Edge Bit

A Knife Edge Bit is a heat-treated steel forging with sharply ground cutting edges much like the blade of a knife. The sharp edges "cut" wood rather than "hammer" wood creating a "clean" wood fragment rather than a "fuzzy" wood fragment …

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Heavy-Duty 8-Pass Bit

The Heavy-Duty 8-Pass Bit is a carbide overlay bit with 8 passes of carbide protection on the forging. All four cutting edges along with two passes on the side of the forging as well as two passes on the face of …

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Bit

The bit is a wear item, that is generally bolted (but can be welded) onto the bit holder, that will take the wear and can be replaced for less money than the larger, more expensive bit holder. Bits sized specific to each machine, …

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Hex Grate

A hex grate refers to the hole shape that is cut into the face of a grate which allows end product to pass through. A hexagonal pattern is made up of 6 sides and 6 angles which allow for efficient nesting of multiple …

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Rectangular Grate

A rectangular grate has rectangle shaped grate openings in the grate material. This style provides very good sizing but without the decrease in productivity experienced with round openings. A rectangular grate refers to the hole shape that is cut into the face …

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Round Grate

A round grate refers to the hole shape that is cut into the face of a grate which allows end product to pass through. A round hole, generally limited to 2” (5.08 cm) or less opening size, produces a more consistent sized product and …

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Square Grates

Square grates refer to the hole shape that is cut into the face of a grate which allows end product to pass through. A square hole can be nested efficiently maximizing open area.

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Bit Spacer

A bit spacer is the 1/4" (6.35 mm) steel plate that is installed between the backside of a grinding bit and the frontside of a bit holder. This spacer is there to protect the expensive bit holder from damage should an operator fail …

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Baffled Grates

Baffled grates have steel strips welded horizontally across the backside of the grate under the hole openings. These strips help hold long wood spears within the opening so a trailing grinding bit can break the long piece of wood into smaller …

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Bear Claw Bit

The Bear Claw Bit utilizes carbide insert technology to create an extremely aggressive grinding bit that is best used when grinding solid wood in a clean, contaminant free environment. The wear-resistant carbide inserts are brazed onto the forging and resemble the claws of a …

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Anvil Breaker Grate

The Anvil Breaker Grate is a Peterson innovation which can be used for grinding asphalt shingles or waste wood for mulch.  The breaker grate has chromium steel breaker bars welded to the inside face which helps break up material more …

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Animal Bedding Grate

Peterson's Animal Bedding Grate is designed with smaller, more precise openings, to filter a smoother finer chip, for customers who require the highest standards for their animals. The animal bedding grate is ideal for customers looking for low static, low …

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Key Knife™

Key Knife™ is the disposable knife system available on Peterson disc chippers and drum chippers.

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Babbitt

Babbitting is the process of bonding a molten, soft alloy metal (Babbitt metal) to a stronger metal. In the case of Babbitted chipper knives, Babbitt metal is added to the back end of a knife so that when it is installed it …

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Wear Part

A Wear part is a part on a machine that is replaced as needed to maintain optimal performance. Wear parts are also often designed to allow for customization: flail chains, chipper knives, and counter knives.

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Knife

Knife is the common term associated with a cutting face, or the sharpened planar surfaced used to separate wood into chips from the main body of the log. Different machines have different knife or blade types and the vast majority …

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Flail Chain

Flail chain is heavy, hardened, specialty chain that attaches to a flail drum. The flail chain whips the log as the flail drum spins, debarking the log.   Peterson standard flail chain is 5/8" (16mm) diameter wire, although different sizing and configurations …

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Face Plate

A face plate is a wear part, and is a flat steel plate between chip pockets attached to the chipper disc. Wear is monitored over time and the face plates are replaced after a certain amount of wear is detected.

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Disposable Knives

Disposable Knives are smaller specialty knives that are single use. They typically have two usable edges and once both edges have dulled, the knives are discarded. Disposable knives may be preferred when chipping contaminated materials. Disposable knives may lower operating costs.

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Counter Knife

A counter knife is a piece of sharpened steel that breaks chips into their desired lengths. Located behind, and similar in appearance to, the chipper knife. A counter knife cuts the chips into the proper lengths, where as a chipper knife …

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Chipper Knives

Chipper knives are tool steel blades that fit inside each of the 4 to 16 pockets located on Peterson chipper drums. A chipper knife cuts the chips to proper thickness. Peterson blades can be sharpened, or when needed, replaced. Peterson Chipper knives have …

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Belly Band

The Belly Band wear part is a metal lining under the chipper disc curved to contour to the chipper disc's shape. Belly Bands help to direct chips to the discharge spout.

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Daisy Chains

Daisy chains are roller chains transmitting motion from the hydraulic auger motor to the sprocket, turning the augers in the feed system.

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Knife

The knife a replaceable wear part that cuts any oversized organic material that may get into the feeder system with the help of the helix of the rotor in the feeder.

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