From Railroad Tracks to Saw Blades

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Before choosing the right diamond blade for your application, it&#;s helpful to know how they are made and how they work. Having this knowledge will ensure a successful experience on your jobsite.

How are Diamond Blades Made?

Diamond blades are made up of two components: the steel core and the segment.

1. Steel Core: Support Part

The core is typically a round flat metal disc used to support the outer segments. The diamond can be attached to the core using vacuum brazing, sintering, or laser welding.  

Vacuum Brazed or Sintered Attachment 

The process level used to manufacture the core is related to the attachment methods. Lower cost, higher volume blades use either a vacuum brazed or sintered attachment process. Vacuum brazed and sintered blades are intended for dry cutting soft material on low horsepower equipment. The cores used for these blades are typically very simple and do not undergo many of the steps of the blades for more aggressive applications.

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Laser Welded Attachment

Of the three most common forms of attaching the segments to the core, and by far the method that yields the strongest bond to the core, is laser welding. As the pioneer in laser welding, Norton continues to develop and perfect laser welding techniques. The more aggressive applications for diamond blades involve the use of higher horsepower equipment wet cutting harder materials to much greater cut depths. The steel cores for these aggressive applications are thicker, heat-treated, precision-ground, and tensioned. The additional thickness and heat treatment allows the core to withstand the flexing stress of the heavier equipment and higher horsepower. The precision grind on the surface minimizes the drag while the tensioning establishes the flatness of the blade at a specific rpm range.  

2. Segment: Cutting Part

The segment is made up of two components: diamond and metal bonds.

A. Diamond Crystals (Cut)

The diamond used is manufactured or synthetic as opposed to natural. Manufactured diamond is preferred over natural diamond because key characteristics like crystal shape, size, and strength can be closely controlled through the manufacturing process. The ability to control the key characteristics of the synthetic diamond allow for accurate prediction of cutting speed and blade life as well as consistent repeatability. Some other important factors to consider about diamond are the:

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• Amount of diamond in the segment
• Quality of the diamond in the segment
• Size of the diamond in the segment