Other Tests to Distinguish Drill Bits<\/h2>\n

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Sparks<\/strong> \u2013 The spark test is a simple method for identifying drill bits. If you grind a drill bit against a grinding wheel, the sparks generated can be used to indicate the material. A spray of orange-red sparks indicates high-speed steel, while a yellow-white spray indicates cobalt.<\/p>\n

Magnetism<\/strong> \u2013 High-speed steel is magnetic, while cobalt and carbide drill bits are not. You can use a magnet to see if the bit attracts to it.<\/p>\n

Sharpness<\/strong> \u2013 High-speed steel drill bits are typically sharper than their counterparts, and therefore have a tendency to have a more accurate hole diameter than cobalt and carbide bits.<\/p>\n

Durability<\/strong> \u2013 Cobalt and carbide drill bits are typically more durable than high-speed steel. They can often cut through hard materials like stainless steel, titanium and hardwood without becoming worn or damaged.<\/p>\n

Price<\/strong> \u2013 Cobalt and carbide drill bits are usually more expensive than high-speed steel. For most DIY applications, high-speed steel is usually sufficient, so unless you need a bit with superior durability or cutting power, high-speed steel is the most economical option.<\/p>\n

Testing the Hardness<\/h2>\n

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A simple way to test the hardness of a drill bit is to use a file. If the drill bit leaves scratches on the file, then it is made of a softer metal, such as HSS. If the file does not leave a mark on the drill bit, then it is made of a harder metal, such as carbide. To test the drill bit further, use a magnet. If the magnet sticks to the drill bit, then it is made of HSS. If the magnet does not stick, then the drill bit is made of carbide.<\/p>\n

To further differentiate the two, you can use a product such as a Rockwell Hardness Tester. This is a device used to measure the hardness of metals, and is more accurate than the methods listed above. By using the Rockwell Hardness Tester, you can accurately determine if the drill bit is made of HSS or carbide.<\/p>\n

In summary, by testing the hardness of a drill bit, you can easily differentiate between HSS and carbide drill bits and make sure you have the right drill bit for the job.<\/p>\n

Testing the Heat Resistance<\/h2>\n

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Drill bits are made from different materials and have varying levels of heat resistance. Testing the heat resistance of a drill bit is an effective way to identify the material it is made from. By doing this, it is possible to determine if it is a carbide or a less expensive high-speed steel bit.<\/p>\n

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• Step 1:<\/strong> Heat the drill bit with a propane torch until the metal starts to change color. <\/li>\n
• Step 2:<\/strong> Observe the color of the drill bit and compare it to the colors of other drill bits made from the same material. <\/li>\n
• Step 3:<\/strong> Carbide drill bits will turn a yellowish-brown color and stay that color even after cooling. High-speed steel drill bits will turn a blueish-purple color and then quickly cool to a silver-gray color. <\/li>\n<\/ul>\n

  By testing the heat resistance, it is possible to easily determine if the drill bit is a carbide or high-speed steel bit. Knowing the material of the bit helps to determine the type of drilling application it is suitable for and its life expectancy.<\/p>\n

  Maintenance of Drill Bits<\/h2>\n