Category Archive: Uncategorized

Applications for Spuncast Composite Gear Blanks

Accurate Specialties is the leading manufacturer of spuncast composite gear blanks. Our spuncast gears deliver the durability and strength of bronze gears while cutting material costs via the use of steel or cast-iron center hubs. Our process and material choices offer the high level of quality and performance you expect at a much lower price point. Our spuncast composite gears are well-suited for use in most any relevant application.

Choosing Accurate Specialties for Spuncast Composite Gear Blanks

As a top manufacturer of spuncast composite gear blanks, we have learned how to make our solutions cost-effective. Our cast iron or steel center hubs we utilize are more affordable than crafting a full bronze gear blank, and without the need for spacers, our composite gears cut the need for added assembly processes. In addition, we receive a bulk discount on materials due to the high volumes of spuncast composite gear blanks that we fabricate, and these savings are passed on to our clients.

We also offer quick turnaround times for your composite gear orders. Components can be completed in as little as one week. Accurate Specialties utilizes integrated manufacturing processes to offer the manufacturing flexibility our customers demand. We guarantee the integrity of all materials, and our strict quality management process ensures a high quality end product.

Industries & Applications

Accurate Specialties’ spuncast composite gear blanks are well-suited for use in most any industry where gear blanks are used. They are relied upon in critical applications across industries such as:

Power Transmission

We offer spuncast composite gear blanks in a range of sizes to meet the demands of most power transmission applications. We also produce bronze gear blanks that are centrifugal cast or chill cast, with a range of common and specialty alloys available.

Our gear blanks are used in the following power transmission applications:

  • Conveyor systems
  • Mining equipment
  • Elevators
  • Escalators
  • Center point irrigation systems
  • Hoists
  • Cranes
  • Milling and manufacturing equipment
  • Screw conveyors and augers
  • CAT scanner positioning systems
  • Solar panel positioning systems

Machine Tools

Our spuncast composite gear blanks can handle demanding loads placed upon them by precision machine tools while delivering sheer resistance in environments where backlash is minimal. Our gear blanks are designed for dependable operation, and made from heavy-duty materials.

You will find our gear blanks in the following machine tool applications:

  • Machine tool components
  • Rotary tables for machine tools
  • Indexing tables for machine tools


Our gear blanks are utilized in various marine applications, and may be customized to meet your specific design requirements.

Marine applications that have utilized our gear blanks include:

  • Boat lifts
  • Cable & wench systems
  • Bilge pumps
  • Water pumps


Our spuncast composite gear blanks deliver superior reliability for the automotive industry. Components may be manufactured to meet exact specifications and are made in a variety of sizes to suit the varying needs of the automotive sector.

You can find our gear blanks in the following automotive applications:

  • Steering mechanisms
  • Gear boxes
  • Gear-drive power transmissions

Gear Blanks for All Industries

Accurate Specialties is an industry leader in the manufacture of reliable spuncast composite gear blanks across the above applications and many more. Request a quote today to learn how our gear blanks deliver superior performance and savings in your application.



How to Make Bronze for Worm Gear Applications

A worm gear is a mechanical arrangement consisting of a spiral-threaded shaft butted against a toothed wheel, resembling a standard spur gear. The threaded shaft, also known as a worm, acts as the driving element, imparting motion to the wheel as the rotational power from the worm is transferred in a 90o plane.

Worm gears are typically used for their high gear reduction ratios. It is common for standard worm gears to achieve reduction ratios ranging from 20:1 up to 300:1. This attribute makes worm gears ideal for applications that require reduced rotational speeds or significantly increased torque. By comparison, it would take multiple conventional gearsets to achieve the same levels of reduction.

Worm gears also have another useful characteristic—they possess a natural self-locking feature by design. The worm can easily turn the gear wheel, but the gear wheel cannot turn the worm, thus preventing reverse movement.


How to Make Bronze

Bronze is one of the most commonly used alloys for worm gears due to the material’s desirable mechanical properties. The term “bronze” covers many copper alloys, though the final product ultimately depends on the other material contained within the alloy. For example, using nickel creates copper-nickel alloys, or using zinc creates brass. Bronze, on the other hand, is most often created by creating a copper alloy with tin or aluminum.

At Accurate Specialties, we utilize a variety of alloys to meet our client’s specific requirements. Typically, for worm gears, we recommend tin bronze (C91700) and aluminum bronze (C95400 and C95500) due to their relatively high strength, and superior fatigue, friction, and wear resistance.

The process of making bronze involves first heating the copper element to a specified temperature. Once the copper reaches a molten state, predetermined amounts of alloying compounds (such as aluminum or tin) are added to the molten copper. The molten alloy mix is then poured into molds for the gear components and allowed to cool.


Typical Bronze Worm Gear Applications

The high torque output of worm gears makes them suitable for heavily loaded machinery. Some of the most common applications for worm gears include:

  • Movable bridge components

The controlled and powerful motion of worm gears are ideal for inducing movements in large and heavy bridge structures.

  • Elevators, lifts, packaging equipment, and conveyors

Worm gears are used to provide the torque needed to transport heavy loads from one point to another. The non-reversible properties of this gear also act as a secondary safety braking system.

  • Heavy-duty construction equipment and trucks

Heavy vehicles often use a worm gear differential for additional power. Depending on the action of the vehicle, different amounts of torque may need to be delivered to each wheel. Worm gears are used to provide the necessary torque that governs each wheel’s performance.


Learn More

At Accurate Specialties Inc., we provide custom worm gear manufacturing services for numerous applications in almost any industry. Our technical team will work with you to help determine the best alloy for your unique specifications.

If you would like to learn more about how to make bronze, bronze worm gears, or any of our other products and services, feel free to contact us or request a quote.

Applications for Bronze Alloys

At Accurate Specialties, Inc. (ASI) we work to satisfy our customer requests and design specifications using optimal alloys to cast a wide range of bronze gears and composite gears for a comprehensive array of applications. We work with numerous bronze alloys, each delivering desired advantages for particular operations. Our expertise guides clients in selecting the best bronze alloy for their needs.


The Copper Development Association

The Copper Development Association (CDA) works to expand the copper market worldwide through its commitment to educating producers, fabricators, and end users regarding the benefits and uses for copper and copper alloys. With a commitment to helping copper businesses thrive, the CDA supports each application where copper plays a role.


Bronze Alloys and Their Applications

Accurate Specialties, Inc. offers a wide selection of bronze alloys to serve the varying needs of our clients. Various alloys can be created specifically to meet the needs of even the most unique or demanding applications. By consulting with each client, we will determine the best choice for your intended purpose or design. Some of the most common alloys we use include:


863 Manganese Bronze

Known for its high-strength and corrosion-resistance, this bronze alloy also features durability and longevity, making it an ideal option for heavy-duty applications such as construction and agricultural equipment. 863 Manganese Bronze is popular in bronze alloy applications such as:

  • Screw-down nuts
  • Load bearings
  • Bronze for gears
  • Cams
  • Gibs
  • Large stem valves
  • Bridge pins
  • Hydraulic cylinder components


907 Tin Bronze

This alloy offers quality corrosion resistance, especially in applications with seawater exposure. This bronze alloy is moderately machinable and performs well in wear and fatigue applications. 907 Tin Bronze is utilized in bronze alloy applications such as:

  • Bearings
  • Bushings
  • Bronze for gears
  • Piston rings
  • Pump components
  • Marine fittings


917 Tin Bronze

Typically selected for its increased load carrying capacity – especially heavy loads involving slow and irregular movement – this alloy is highly corrosion resistant and requires adequate lubrication.

917 Tin Bronze is commonly used for applications such as:

  • Bearings with slow speed and high load
  • Gears
  • Movable bridge components
  • Wheels in worm drives
  • Turntables for bridges


954 Aluminum Bronze

This extremely strong bronze alloy  features superior corrosion resistance. It is the most popular aluminum bronze alloy, selected for its exceptional elevated temperature strength, weldability, high tensile and yield strength, as well as ductility. 954 Aluminum Bronze is commonly used in bronze alloy applications such as:

  • Worms and worm gears (low speed/high strength)
  • Spur gears
  • Bushings
  • Bearings
  • Pickling (baskets/hooks)
  • Valve components


955 Aluminum Bronze

This alloy is among the toughest non-ferrous alloys available. It offers superior yield and compressive strength with high hardness and elongation. 955 Aluminum Bronze offers good corrosion resistance to seawater, as well as impressive heat resistance. It is weldable with good machinability. 955 Aluminum Bronze is found in applications including:

  • Bushings
  • Agitators
  • Landing gear components
  • Bronze for gears
  • Pickling (baskets/hooks)
  • Worms
  • Aircraft engine (seats, valve guides)

Bronze Alloys: Request a Quote

ASI is a leading North American manufacturer of blank gears. With our own bronze foundry and machine shop, we provide end-to-end fabrication services for a wide range of customer needs. We offer quick turnarounds, often delivering in only a week. Customers should note that ASI does not currently cast bronze alloys with high lead content (for example, 928, 932, and 943).


To learn more about ASI and our products and services, please request a quote or contact us.

Vertical Centrifugal Casting

The techniques used to mold and shape metals have evolved significantly over the centuries. Forging, sand casting (static casting), and rolled and welded procedures are just some of the traditional methods used to manufacture metal parts and components. However, there are many applications where these fabrication methods are either unsuitable or inefficient.

The centrifugal casting process can produce components with intricate geometries at a lower cost and with reduced machining requirements in comparison to other commonly used casting methods. The process entails pouring molten metal into the center of a rotating mold. The centrifugal force induced by the rotation pushes the molten metal against the inner wall of the mold to create the intended shape. The molding dies can be oriented horizontally (horizontal centrifugal casting) or vertically (vertical centrifugal casting).

When to Rely on Centrifugal Casting

Centrifugal casting has traditionally been used to manufacture hollow shapes with specified thicknesses in the instance where the end product requires the most dense “best” material on the OD of the product. Due to its mode of operation, centrifugal casting is most suitable for components with axisymmetric geometries (i. e., shapes that are symmetric about a given axis). One benefit of centrifugal casting is reduction in instances of retained air pockets or porosity in the finished product.

Because centrifugal casting is done with a predetermined mold size and controlled via electronic means, it is best suited to applications that require high accuracy. Products with precise dimensions and weight can be manufactured to tight tolerances by controlling the casting process with computerized controls.

Although most commonly associated with molten metals, there are centrifugal casting advantages when used with virtually any material that can be melted into a pourable slurry, including concrete, glass, ceramic, and plastics.

The Vertical Centrifugal Casting Process

The vertical centrifugal casting process consists of several stages. At the beginning, the molten metal is poured into a vertically oriented preheated rotating die. The centrifugal forces in the vertical spinning mold then cause the molten metal to spread horizontally and vertically along the inner diameter of the mold so that it assumes the specified shape.

As the mold and die spin, the denser elements of the molten metal are pushed toward the outer diameter. In a process known as directional solidification, the mold acts as a cooling surface which solidifies the metal from the outer diameter as it moves towards the bore. This process causes impurities to ‘float’ toward the inner diameter, from which they can be machined away when the casting process is complete.

The result is a final product with superior mechanical properties and a more uniform, fine grain structure. For this reason, vertical centrifugal casting techniques are used to manufacture components in the aviation, aerospace, military, petrochemical, and any other industries that require high-reliability components.

Although vertical and horizontal castings can produce products of similar quality, castings with vertical orientations are more suitable for cylindrical shapes with a diameter several times larger than the depth (or height) of the cast. Rings and bearings are examples of products best suited to vertical centrifugal casting.

Vertical centrifugal casting can also be used to cast non-cylindrical parts such as valves and propellers by using specialty castings. Other products that are commonly produced with vertical centrifugal casting methods include:

  • Balls for ball valves
  • Gear blanks
  • Short bushings
  • Flanges
  • Sprockets

Accurate Specialties Inc. is an industry leader in manufacturing centrifugal cast bronze gear blanks. Our vertical centrifugal casting techniques produce gear blanks with high purity, density, and durability. Our state-of-the-art equipment generates pressures up to 60 times the force of gravity to segregate and remove impurities and other unwanted elements from our products. All of our gear blanks are machined with high dimensional accuracy using our advanced 4-axis, CNC-controlled VTC to ensure proper installation and minimization of errors.

At Accurate Specialties Inc., we have developed countless gear blanks for thousands of applications for over 30 years. Our ISO 9001:2015 certified quality systems ensure that each one of our gear blanks and friction materials exceeds industry standards and leaves our facilities in the best possible condition.

To learn more about our centrifugal cast gear blanks or our other services, feel free to contact us.


Accurate Specialties visit from 33rd Assembly District Representative Kapenga

(July 26, 2012) Accurate Specialties Inc., a composite gear manufacturing company and one of eight subsidiaries of The Fisher Barton Group, hosted a visit from State Representative Chris Kapenga and fellow campaign supporters on Thursday, July 26, 2012.

Representative Kapenga chose the 33rd District Fisher Barton location to announce his candidacy for the State Senate, which is being vacated by Senator Rich Zipperer. The Accurate Specialties stop was the first of four visits to companies within his district on Thursday at which he made the same announcement and received operational tours.

During his speech, Representative Kapenga extended his gratitude to Dick Wilkey, Fisher Barton company founder, for his confidence and support of Wisconsin business. “When I met Dick a few years back, he was worried about the future of our state’s business economy. Then we began to prove that Wisconsin IS in fact open for business with a strong and durable economy backed by government support, and Fisher Barton committed to a multi-million dollar materials laboratory expansion. I was happy to be a part of the grand opening of this new lab last August, and in addition, this $1.5 million dollar machine behind me was made in Wisconsin, for a Wisconsin business, and will help add more jobs in Waukesha and Wisconsin.”

Accurate Specialties and The Fisher Barton Group are primary sponsors for the 2011 Wings Over Waukesha Air Show.

Accurate Specialties and The Fisher Barton Group took a lead role in the Wings Over Waukesha Air Show. In the past, the event was a static display event without flying performers other than some formation fly overs rides for purchase in vintage aircraft. However, 2011 marked the first time in 30 years that Waukesha County Airport, formerly Crites Field, held a full air show.

The performers included wing walkers, aerobatic flyers that included John Mohr in a stock 1942 Stearman, Jim “Fang” Maroney in his Super Chipmunk, Dave Dacy and Tony Kazian performing wing walking routines in a Super Stearman, and Dr. Bill Blank in his Super Decathalon.

The event was held for the purpose of bringing visibility to the Waukesha County Airport and its use by the General Aviation community generating income and value for Waukesha County. Nearly 20,000 patrons attended the event. The Fisher Barton Group headquarters and Accurate Specialties facility, both located across the street, are committed to an active role in our community. We urge everyone to support their military and the history of aviation through events such as this.