![]() The making of the rest is straight forward. My progress on the making of the rest can be seen here: Hall’s web page, the article is described, as well as a few videos are presented on how to use the rest and the various jigs. The book give a full plan and description with photographs on how to make it, as well as on how to use it. It can be found by doing a search on the Internet. You have to purchase your own copy of the book by Harold Hall to get the plans of the rest, rigs and the adaption of the bench grinder. This tool rest allows you to be able to present your tools to a grinder wheel at the correct angle by way of clamping with the jig. No milling machine is needed, although the making will be easier if you do have a milling machine, or access to one. This tool rest can be made on a lathe only. I decided on the basic tool rest of Mr Harold Hall. I decided that I agree with a lot of people who sharpen their own equipment with the proper tool rest and jigs. I have read a lot of articles, together with my own experience in cutting my own lathe tools and my own experience on my drill bit sharpening. I do not have the funds to purchase a tool & cutter grinder, nor have the time to build one. ![]() We’re always happy to answer any questions you might have, and give you the benefit of our experience to ensure you have the right tools to do the best job.As the home user of a lathe and milling Machine, I have long ago identified the need to be able to sharpen my own milling cutters and properly sharpen drill bits and lathe tools. Barrett we’ve been supplying the public and the trade with high-quality tools since 1975. If you’re unsure of the equipment you need, then speak to us. Using the correct drilling technique improves the lifespan of any drill bit. Even the hardest wearing materials can become blunted or dulled after a period of hard work. HSS and cobalt drills need to be cared for and maintained to ensure they deliver consistent performance. ![]() For less intensive operations, like drilling through wood, plastic or light metals, an HSS drill bit is perfect. Cobalt bits aren’t suitable for general applications. The strength of cobalt means that drill bits are better suited to the tough challenge of cutting through steel. Each of these has its strengths and weaknesses which you should be aware of before buying. You will find cobalt drill bits stocked alongside other popular choices, including titanium coated, titanium nitride and tungsten carbide bits. It’s crucial for the safety of your tools and yourself that you use the right bit for the job. If your cobalt drill bits aren’t cared for properly or are dropped, they can break – which can prove costly. Like other HSS bits, they are corrosion-resistant, which means they should retain their condition in all storage and usage conditions they’re likely to experience. The cutting edge on a good quality cobalt bit should last for longer than a standard HSS bit. They are also able to cut through weld seams. Cobalt bits are able to cut through the most hardened metals, including bronze, cast iron, stainless steel and titanium. They are most often used to cut through hardened and abrasive materials. The ability to withstand heat means that cobalt bits perform for long periods without cooling or the need for cutting fluid. ![]() They can be operated at much higher speeds than a standard HSS drill bit. By combining a small amount of cobalt with another alloy, the results are incredible.Ĭobalt drill bits are incredibly strong. Cobalt has a melting point of 1495☌ and a boiling point of 2927☌, which makes it perfect for use at high temperatures. What are cobalt drill bits?Ĭobalt bits are a combination of steel (or another alloy) mixed with a small percentage of cobalt, typically between 5 – 7%. If you’re using HSS drill bits for long periods or at high RPMs, you may need to use cutting fluid to keep the bit cool. Over time, HSS drill bits can become blunt and need to be sharpened, which demands specialist tools that aren’t always available. They’re safe to operate at high speeds (RPM) and provide long-lasting performance – as long as they are maintained. HSS drill bits are capable of safely drilling through hardwood, some metals and plastic. The large concentrations of chrome and nickel in stainless steel ensure that HSS bits are super strong and durable. HSS bits are hardwearing and heat resistant. In this article we describe the difference between High-Speed Steel (HSS) and cobalt drill bits, their strengths and weaknesses, and when you should use them. When it comes to drilling, selecting the right tool for the job is crucial. Sturdy, hardwearing and robust, modern metal drill bits can cut through the toughest materials with no trouble. The Difference Between HSS and Cobalt Drill Bits ![]()
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