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Tool Materials & Coatings
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The Originator of the Midget Mill®, and Chatterless-Countersinks™
Over the years Severance Tool has become known not only as the originator of the ground flute rotary file, Midget Mill®, and Chatterless-Countersinks™, but also the manufacturer and inventor of the highest quality unique rotary deburring and finishing tools. The many fluting geometries offered in the Severance Catalog are backed by the highest of fluting standards. These standards, quality craftsmen, quality machinery and the highest requirements for materials assure a quality tool that to the trained eye is no less than beautiful. There really is a difference! |
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High Speed Steel (H.S.S.)
In general, high speed steel rotary files are better for less rigid, hand operations where some chatter is likely. High speed steel Midget Mills® also come with a standard chip breaker, holding a good finish while improving the cut due to producing smaller chips. Severance high speed steel cutting tools are manufactured with quality M2 steel with a Rockwell of 63-65. Hard cutting edges are backed up by a tough, fatigue-resistant body to give excellent performance under the most demanding service conditions. |
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Carbide (Tungsten/Cobalt - Special Blend)
Carbide rotary files are for operations in rigid environments where chatter is minimized and tool control is high. Severance uses special grades of carbide, which are formulated by custom suppliers and sintered at the Severance plant. The carbide is a special blend of Tungsten and Cobalt with a Rockwell A scale hardness of 91.7 to 92.2 which is comparatively harder and tougher for a longer tool life. These custom grades have been selected because they hold a fine cutting edge, which can be reground many times before the tool is used up. Carbide may be operated at many times the speed of steel tools and generally yields as much as five to ten times the service life. |
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Tool Coatings - Super Hard and Durable
Many high speed steel tools can be used where carbide might be easily chipped. Gold TiN-coated tools feature the same tough HSS bodies as the high speed steel line, but have a layer of super-hard titanium nitride deposited on their surfaces. These tools, available on special order, will out last regular high speed steel cutters, under most conditions, by a factor of about 3 to 1. Some of the other coatings available on our Carbide and H.S.S. tools include TiCN (titanium carbon nitride) and TiAIN (titanium aluminum nitride). Consult our engineering staff with your requirements and about other coatings. |
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Grayhone™- Fully Honed for Immediate Use
A process developed by Severance Tool which eliminates the need for a break-in period on tools. Grayhoned tools are ready to operate at full production speeds right out of the package. This saves time and money in a full range of production operations. Severance utilizes an additional proprietary process in the production of Grayhone'" tools. After the tools are sharpened with a grinding wheel, they are also honed before shipment to users. The Grayhone™ process also imparts a distinctive appearance to the tools that provides an added benefit. The dull gray color offers a built-in wear indicator that helps quality control efforts. When the cutting edges start to look shiny, it means that they are becoming dull, and the tools need replacement or resharpening. An overly dull tool causes bad part finishes, and increases the cost of resharpening. |
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