The problem is that many stainless steels – 304 and 316 in particular – can get harder and tougher to cut as you work if the cutting tools are improperly applied. As a guess I would have you start at around .0001 / tooth and if you are using carbide then probably the max spindle speed that the machine is capable of up to at least 20,000 rpm (that would give you 167 SFM.) For this experiment, a nitrogen plasma water-injection system was used. Cutting speed. This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply. A go-to material in transportation, consumer goods, food production, construction, and a variety of other industries, stainless steel plates and tubes are popular work materials for drilling and tapping applications. When it can be cut normally, evaluate the cutting function of the SUS 316 stainless steel industrial tube according to the surface roughness of the workpiece, the cutting speed and the degree of tool wear. Now the same processes are used for special drills and end mills so we can provide the fastest delivery possible. Whether you are a tool user or a distributor, subscribe to our newsletter for the latest metal cutting tool resources. This is largely due to their high chromium content, with most grades of stainless steel alloys containing at least 10% of the element. For thin sheet materials up to about 18-gauge in thickness (the lower the gauge the thicker the metal), the best ordinary shop tool is electric shears. What’s more, there are lots of proven methods that are certain to help you. 180-225 SFM. Three plasma arc cutting (PAC) systems were used to prepare cut samples for metallographic analysis: 1. © 2021 Copyright Practicalmachinist.com. It is used for can of foods, chemical products and construction purposes. Speeds for turning based on a feed rate of 0.012 inch per revolution and a depth of cut of 0.125 inch. Stainless steels are high-alloy steels with superior corrosion resistance to carbon and low-alloy steels. With more than 10.6 million unique visitors over the last year, Practical Machinist is the most visited site for metalworking professionals. As an example, the Hypertherm XPR300 will cut 12mm mild steel at nearly 3 meters per minute (quality = 1), whereas it would cut stainless steel at 1.7m/min (quality 1). Regal specializes in custom special taps, to ensure you have the exact tool you need for your application. Ferritic stainless steel falls into the 400 grade in the AISI numbering system, along with martensitic stainless steel. They come with a split point that will allow you to drill three times longer than other bits. Injection water impinges directly onto the plasma jet to constrict the arc and protect the torch nozzle. But running work at proper feeds and speeds is the best way to cut clean holes and tap stainless steel most efficiently. These steels contain chromium and most, but not all, contain no nickel. Traditionally high speed tool steel have been used for most turning operations, but carbide tipped tool are now also used. While narrow-diameter drill bits must maintain a minimum speed to be effective, wider bits, especially when used to bore deeper holes, must be dialed back to lessen the risk of breakage. Before discussing the proper taps and drills for working with stainless steel, it is important to understand the material’s characteristics in order to extend tool life and achieve quality workmanship. One of the big problems that I see in the milling world is that people describe their cutting parameters in inches per minute and revolutions per minute. Chips clogging in the flutes typically will cause catastrophic tool failure but can also cause the tool and the workpiece to vibrate excessively which is not good for the cutting tool, hole finish, and thread quality. This process uses a plasma-forming gas and injection water. This process us… Machining 304 vs. 316 Stainless Steel – what do you do differently? I was just figuring out what the SFM would be at 20K, I don't know if you are surprised that it is low or high. ... 180-225 SFM. 2. This phenomenon, known as work hardening, occurs because of the heat generated if the incorrect speed and feed rates for drilling and tapping stainless steel are applied. Click for Inches. Our tools come in every machine screw, fractional and metric size imaginable. High feeds will help the tool cut, evacuate chips and to cut through work-hardened material. Cutting speed may be defined as the rate at the workpiece surface, irrespective of the machining operation used. From there, small changes in composition are made to the base in order to create specifi… It has been many years since I have ran 316 stainless steel. We have produced speed and feed charts for both metric and imperial drill bit sizes. Feed rates can be relatively high, so long as you’re careful to guard against breakage and tool weakening owing to high heat. Types of Stainless Steels Austenitic Type 316 Ferritic Type 430 Duplex Type 2205 . Practical Machinist is the easiest way to learn new techniques, get answers quickly and discuss common challenges with your peers. Very clean edge we can derive recommended cutting speeds for stainless steel torch nozzle ; reduce your speed SFM. Sending us an email via our Contact us page and its appearance the! Year, Practical Machinist is the comparing of materials on their ability to be machined.0004 per tooth which way. Sign up for our eNewsletter now to stay in the machining process in shop. If not, stop regularly to reapply oil or coolant, general purpose alloy adequate pressure because... While different applications and grades of stainless steel, you can use cemented carbide tools or high-speed steel HSS... 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