Eagle Group Blog | Processes

Introduction to Metalcasting

Posted by Jeff Cook on 2019 Oct 30

This introduction to metalcasting provides a brief overview and history of the casting process, as well as an outline of common casting techniques in use today. The goal of this article is to give new manufacturers a better understanding of how metalcasting works and what steps are involved in producing cast products. By the end of the article, the reader should have a clear picture of the opportunities presented by metalcasting, and a sound appreciation for its potential as a modern manufacturing method.

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Tags: Metalcasting, Processes, History

What Precision Machine Shops Do: Grinding

Posted by Nik Seyferth on 2019 Aug 26

Grinding is a machining process using abrasive surfaces to remove material from metal workpieces. On the surface (pun intended) grinding may seem different than other machining processes, but it still works through chip formation and removal–just like sawing, milling, broaching and most other techniques. Grinding can produce surfaces conforming to rough or extremely close tolerances. Because of its versatility, grinding is used for simple gate removal in castings as well as advanced finishing processes like polishing and sharpening.

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Tags: Processes, Machining, Eagle CNC, What Precision Machine Shops Do, grinding

What Precision Machine Shops Do: Broaching

Posted by Nik Seyferth on 2019 Jul 9

Broaching is a machining process using a cutting tool with teeth that increase in size from front to back. In many cases, an entire surface (or multiple surfaces) can be finished in a single pass with broaching. The technique is most often applied to finish holes, splines and flat surfaces.

Broaching is a relatively new machining process, developed in the 1850s with metal-specific applications. Originally, broaching was used to perform work on internal characteristics, like keyholes in pulleys and gears. During the 20th century, broaching was further developed for use in firearms, and subsequent developments have dramatically improved tolerances and made broaching more versatile for modern machine shops.

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Tags: Processes, Machining, CNC Machining, Eagle CNC, What Precision Machine Shops Do, broaching

What Precision Machine Shops Do: Sawing

Posted by Nik Seyferth on 2019 Jun 25

Sawing is one of the oldest cutting techniques in use today, and innovations have allowed the process to keep up with advances in material, tolerances and product complexity. By definition, sawing is cutting a narrow slit in a workpiece by moving a toothed or abrasive cutting tool against the surface. Sawing is often used to remove large sections of material without particular concern for tolerances, but modern CNC sawing machines can be used for finishing work as well.

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Tags: Processes, Machining, CNC Machining, Eagle CNC, What Precision Machine Shops Do

Introduction to Greensand Casting

Posted by Jim Smith, Jr. on 2019 Jan 22

Greensand casting is a time-tested and highly versatile metalcasting process. Different foundries use different methods and materials, but greensand casting always involves creating molds by compacting moist, organically bonded sand around patterns. Whereas shell molding uses heat-bonded sand and no-bake casting uses chemically bonded sand to form molds, greensand casting is unique in that sand is bonded through naturally occurring compounds–in most cases, the bonding agent is clay.

Eagle Aluminum Cast Products makes use of greensand casting to produce large aluminum castings. The greensand process is very customizable and capable of manufacturing nearly any type of cast product. Here, we'll explore the processes, casting characteristics, benefits and challenges of the greensand casting process.

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Tags: Metalcasting, Processes, Eagle Aluminum, Greensand Casting

What Precision Machine Shops Do: Drilling

Posted by Nik Seyferth on 2018 Nov 14

Drilling is one of the most common techniques used in manufacturing to create holes. In contrast to other hole-making methods like boring, reaming and tapping, drilling is most often used to create holes in unbroken surfaces. In precision CNC machining, drilling can range in scope from simple, rough hole drilling to complex, multi-feature hole drilling.

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Tags: Processes, Machining, CNC Machining, Eagle CNC, What Precision Machine Shops Do

What Precision Machine Shops Do: Milling

Posted by Nik Seyferth on 2018 Jul 18

Milling is one of the most common processes in CNC machining, most likely because it is so versatile. Using a single tool, machine shops can create nearly limitless shapes on the surface of a workpiece. Milling can completely transform a piece of metal stock into a finished part of nearly any complexity.

The milling process in CNC machining consists of removing material with a rotating cutting tool. Unlike turning, the workpiece does not need to rotate in milling operations. In some cases, the workpiece will move linearly against a cutting tool; in other cases, the workpiece will remain stationary while the cutting tool moves. 

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Tags: Processes, Machining, CNC Machining, Eagle CNC, Milling, What Precision Machine Shops Do

What Precision Machine Shops Do: Turning

Posted by Nik Seyferth on 2018 May 16

Turning has been practiced by machinists for centuries on many different materials. Originally, turning acted on wood to create complex, cylindrical designs for use in tools, handles, furniture. Today, turning is a vital part of the metal manufacturing process, and a major technique used by precision CNC machine shops in the United States and around the globe.

Turning is the process of rotating a workpiece and bringing it into contact with a cutting tool. As the workpiece turns, the rotating motion forces the cutting tool to strip away material. The cutting tool itself can move linearly, either parallel or perpendicular to the axis of the spinning workpiece. Cuts made in turning, and the resulting shape of the workpiece, are determined by the motion and shape of the cutting tool.

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Tags: Processes, Machining, CNC Machining, Eagle CNC, Turning, Lathe, What Precision Machine Shops Do

How Investment Casting Compares to Other Metalcasting Methods

Posted by Deb Pipoly on 2018 May 8

All metal casting processes have their own unique characteristics. When designing a new part for casting, the most appropriate process should be determined by a number of factors, including:

  • Tooling costs
  • Labor costs
  • Design characteristics
  • Desired appearance

The goal of the manufacturer and the supplier should be to find the optimal balance that produces the lowest per-part cost at a given quantity, while meeting or exceeding all quality requirements.

Here, we compare investment casting to three metal casting processes: shell mold casting, greensand casting and permanent mold casting.

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Tags: Metalcasting, Processes, Investment Casting

Casting Aluminum: Comparison of Methods

Posted by Jim Smith, Jr. on 2018 Mar 22

Aluminum can be shaped through a wide variety of process, including:

  • Casting
  • Extrusion
  • Forging
  • Rolling

For any type of metal, casting is arguably the most versatile of all of the forming processes, and results in the greatest variety of parts. In fact, the US Department of Energy estimates that over 90% of all manufactured goods contain metal cast products.

The same casting techniques used for other metals can be applied to aluminum, but some of the most popular methods used with aluminum are permanent mold casting, greensand casting and die casting.

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Tags: Metalcasting, Processes, Aluminum Casting, Aluminum, Eagle Aluminum

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