HSS (High-Speed Steel) is a type of tool steel that is known for its high hardness and wear resistance. HSS-Co (High-Speed Steel with Cobalt) is a variation of HSS that contains added cobalt, which increases its hardness and heat resistance. HSS-TiN (High-Speed Steel with Titanium Nitride coating) is HSS that has been coated with a layer of titanium nitride, which further enhances its hardness and wear resistance. In summary, the main differences between these three types of steel lie in their composition and the additional elements or coatings that enhance their properties. **

For a cordless drill, it is generally recommended to use HSS-G (high-speed steel with added cobalt) drill bits. HSS-G drill bits are designed to withstand the higher torque and speed of cordless drills, making them more durable and longer-lasting. They are also better at dissipating heat, which is important when using a cordless drill that may not have as much power as a corded drill. Overall, HSS-G drill bits are better suited for the demands of a cordless drill compared to HSS-R (high-speed steel roll forged) drill bits. **

The main difference between hm and hss is their purpose and focus. Hm (humanities) is a field of study that focuses on human culture, history, literature, philosophy, and the arts, while hss (social sciences) is a broader field that includes disciplines like sociology, psychology, anthropology, economics, and political science. Hm tends to focus more on the human experience and interpretation of the world, while hss often involves the study of society, behavior, and relationships between individuals and groups. Both fields are important for understanding human society and culture from different perspectives. **

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To remove a broken High-Speed Steel (HSS) drill bit, you can try using a pair of needle-nose pliers or a screw extractor tool. First, try gripping the broken end of the drill bit with the pliers and gently twisting it out. If that doesn't work, you can use a screw extractor tool by drilling a small hole into the broken drill bit and then using the extractor to remove it. Be sure to use caution and wear protective gear when attempting to remove a broken drill bit. **

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Cooling when turning with High-Speed Steel (HSS) and Hard Metal (HM) is typically done using a combination of cutting fluid and air or mist cooling. Cutting fluid is applied to the cutting edge of the tool to reduce friction and heat generation, while air or mist cooling is used to remove the heat and chips from the cutting zone. This combination helps to maintain the tool's cutting edge and prolong its tool life, while also improving the surface finish of the workpiece. Additionally, the use of proper cutting speeds and feeds is essential to ensure effective cooling and efficient metal removal. **

To drill out a broken HSS drill bit, you will need a carbide drill bit that is slightly larger than the broken bit. First, use a center punch to create a small indentation in the center of the broken bit. Then, carefully drill into the broken bit using the carbide drill bit, applying steady pressure and using cutting oil to lubricate the process. Once the broken bit is drilled out, you can clean the hole and continue with your project. Be sure to wear safety goggles and work in a well-ventilated area when drilling out the broken bit. **