However, due to. The Woodruff key is a small, semicircular metal piece that fits into a slot on Crankshaft Woodruff Key Shearing is a common issue that can occur in engines. I engineer and design machines on a daily basis and cost is always a first consideration. These pockets can be set by a cutter to set the dimensions. 1 - 18 of 18 results for Woodruff Key Compare Refine. The keyway is a semi-circular pocket set into the shaft. if you will notice the geometry on most chisels use the short side against the shaft and knock the key downward. The main advantage of the Woodruff key is that it eliminates milling a keyway near shaft shoulders, which already have stress concentrations. Be gentle, and work the key back and forth until it starts to move. These keys are easy to remove and simple to use. It was developed to introduce open and license-free standards for secure passwordless authentication over the Internet. Set screws and pins can also work as an alternative to the keyed joint. The pulley is tight against the crank but moves a few degrees left or right when I turn the alternator to adjust static timing. Crankshaft keys (also called Woodruff Keys) are semicircular shaped, removable keys that fit into matching keyways cut into the crankshaft leaving protruding tabs. Mergers & Acquisitions. Uses. Upper part of the woodruff key is flat, and the bottom part is a semicircular disk of uniform thickness, which means it looks like a “half-moon”. 7 Woodruff Key10PCS 3x13x5 Woodruff Key10PCS 3x16x6. Woodruff Key The woodruff key is an easily adjustable key. You'll need to be far more specific. Thus it works like a safety device. Top Benefits of Digital Marketing 1. Woodruff key definition: . And also, the total stresses beside. It also uses symmetric and asymmetric keys to encrypt data that is transferred across networks. Since woodruff keys are made to tight tolerances, they often require a press-fit. Woodruff keys are semicircular shaped, such that, when installed, leave a protruding tab. Woodruff-Sawyer & Co. 4. The main advantage of the Woodruff key is that avoids the milling of a keyslot near stress-concentration prone shaft shoulders. The shaft may be parallel or tapered, showing the method of dimensioning shafts for the Woodruff key where the depths of the recess from the outsides of the shaft are given, in addition to Splined Shafts from Grob, Inc. For your convenience, parts from this product range can also be found in our PDF catalogue: Keysteel Parts from the. The main advantages of a woodruff key 1. The woodruff key is a shaft key made in the form of a segment of a disk and used with shafts not more than 2¹/₂ inches in diameter. Woodruff key is a type of sunk key. thru 3/4 in. It is a special type of parallel key which. Firstly, Woodruff keys provide a compact and efficient means of connecting rotating components to shafts without the need for additional fasteners or complex mechanisms. A Woodruff key, Fig. This type of key tends to have a lesser shear strength than compared to that of a rectangular or square key. Is intended for the general application to cylindrical shafts and shafts ends, and gives the relationship which should be observed between the diameter of shaft and the section of key. Cost Control Importance for the Company. Woodruff key differs in shape from other keys. Pay down debt: Paying off debt is always a good move. This set of square keys is 90 or 120 degrees apart. 4571. Mar 13, 2015. Performance Tool W5343 80Pc Woodruff Key Assortment SAE #1 Best Seller . Return Policy. Woodruff keys measure 1/4 in. 3/32". 1 day ago · Free agent right-hander Noah Syndergaard is reportedly drawing interest from multiple clubs. 1/2". They make our code more structured and readable. Imperial - 1/6" x 1/4" - 3/4" x 3. Woodruff Keys are used to improve the concentricity of the shaft for high-speed operation. Firstly, Woodruff keys provide a compact and efficient means of connecting rotating components to shafts without the need for additional fasteners or complex mechanisms. Style. Add to Cart. Sunk keys are of several of types such as Woodruff key, Gib head key, Feather key, Parallel sunk key, Square sunk key. 49 135Pcs Woodruff Key Assortment Kit, Half Moon Gear Shaft Drive Semicircular Flywheel Key. GET NEW COUPONS. whack the bottom of the key horizontally. In fact, RWI is used in an estimated 75% of private equity transactions and 64% of larger strategic acquisitions. Request No Charge Material Cert. To lower the risk of spreading the virus, national governments across the world required people to WFH unless they were key workers [3,4]. The Hillman Woodruff Key is a semi-circular keys that is commonly used for mechanical applications. What are the advantages and disadvantages of a woodruff key? Disadvantages of woodruff key : The extra depth of keyways in the shaft increases stress concentration and reduces its strength. We offer durable quality products at affordable prices and free shipping on orders over $99. Parallel Keys zThe key seats in the shaft and the hub so that exactly ½ of the key bears on thePart of the sunk key resides within the rotating shaft, while the rest fits into the hub or boss. The flat saddle key is a taper key that fits into a keyway in the hub and is flat on the shaft. Saddle Key: Fig 2: Saddle keyNationally Ranked University. And the straight side is in the gear or pulley hub. A woodruff keys are perfect for high. We can. (ayton) I've done the non a/c conversion using washers to space over the pulley, and the woodruff key wouldn't fit. So how old a machinist handbook would I need to find it?Using Woodruff keys offers several advantages in various applications. Some say the best advice for newcomers to recovery on how to stay sober is simple: "Don't drink or use, and go to meetings. 1 percent more likely to produce a novel paper and 14. This does not include the little hump of the shaft that gets removed. A mixed-gender team of six or more researchers was 9. Firstly, Woodruff keys provide a compact and efficient means of connecting rotating components to shafts without the need for additional fasteners or complex mechanisms. Table 11 on page 955 (18th edition) titled "USA Standard Keyseat Dimensions for Woodruff Keys (USAS B17. During medieval times, religious leaders would often adorn their churches with the fragrant perennial herb. Disadvantages of woodruff key :. The fundamental advantage of woodruff keys is that they do not require machining at the shaft shoulders, which reduces stress concentrations at the shaft's end. The materials of Woodruff keys like keysteel and stainless steel can be ordered online but they can be found made of other materials such as Aluminum. Besides, sweet woodruff can be added to medicines to boost their taste and flavor. Profile. Employee Benefits. It can be used with tapered shafts as it can tilt and align itself on the shaft. x 1/4 in. Woodruff keys are used on shafts from ¼” diameter to 2-1/2” diameter. Available in many different sizes and thicknesses; Conveniently packaged in a variety of piece counts to assist with both small and large projects; Easy to InstallThe Hillman Woodruff Key is a semi-circular keys that is commonly used for mechanical applications. What both variants have in common is that they eliminate the standard user login with. Also known as half moon keys. 5. The keyway in the shaft is a semi-circular pocket; the mating part is a longitudinal slot. Never use a too small a key. STOREHOUSE Woodruff Key Assortment – 80 Pc. 🌎 EN FR DE ES IT HR SV SR SL NL The Woodruff key is a small, semicircular metal piece that fits into a slot on Crankshaft Woodruff Key Shearing is a common issue that can occur in engines. Material, heat treatment, hardness or finish is not within the scope of this standard. The more exact fit of the key and keyway also reduces play, and. Should I try to fit key with epoxy, JB Weld or something or leave as is and set timing. The width to thickness ratio of a key is different. If you must use a woodruff key just look at the size of the hole in the part and then look at one of the newer woodruff keys which will give you the tollerance. Dimensions of parallel keys and taper keys. 6. We’ve got steel straight and Woodruff keys in a variety of sizes to fit any need. Distinct Advantages:Can automatically adapt to the slope requirement. The advantage of a Woodruff Key is that once the key is properly installed, it is captive and cannot walk itself out of the shaft. Our Woodruff Keys Are For Locking Wheels, Pulleys, etc. Note: the quality of the police response is likely to cause or help to prevent a CI. Imperial - 1/6" x 1/4" - 3/4" x 3. The hollow saddle key is a taper key that fits in a keyway in the hub. Firstly, Woodruff keys provide a compact and efficient means of connecting rotating components to shafts without the need for additional fasteners or complex mechanisms. Since they are not fitted at the shaft end, stress concentration is reduced at the shaft end. . The key way is a groove or slot that is machined into the crankshaft to accommodate the woodruff key. That's on page 952 Table 8, titles Finding. ANSI Standard Woodruff Key Size Table Chart ANSI B17. The more exact fit of the key and keyway also reduces play, and stress concentrations in, and improves theThe main advantage of the Woodruff key is the elimination of milling near shaft shoulders, where stress concentrations and concentricity would be affected. The advantage: Properly installed, it is captive and cannot walk out of the shaft. Saddle keys A saddle is a key which fits in the keyway of the hub only. If the key is damaged, it should be replaced with a new one to ensure proper functioning. For years, we at Woodruff Sawyer have talked about how nearly every company—large and small, in. Limited Lifetime Warranty. 6 Woodruff Key10PCS 2x10x3. Woodruff Keys manufacturers, service companies and distributors are listed in this trusted and comprehensive vertical portal. The shaft keyway is designed with a semicircular gap to fit the key in the Shaft. The more strategies you learn to identify triggers, cope with stress, and manage your new sober life. Woodruff Key Kit, 135 Pcs Woodruff Key,Flywheel Pulley Crank Way Key Assortment Kit for Multiple Purpose, 21 Kinds, Screw, Coveralls. Parallel Sinking Keys #4. ostrow armed services vocational aptitude batteryDES has both a 64-bit block and key size, but in practice, the key only grants 56-bits of security. Improves the quality of decisions: Better availability of information reduces uncertainty. spladle160 ArboristSite Lurker. These pockets can be set by a cutter to set the. If, for instance a lawn mower blade hits an immovable. For an account call. It is similar to other popular encryption methods such as Kerberos, which authenticates network users, secure sockets layer (SSL), which secures websites, and the Secure File Transfer Protocol (SFTP), which protects data in motion. They are made over size to fit all applications. The main advantages of a woodruff key are as follows : 1. File it down to fit, then cut it to length with the hacksaw. Ans. This article explores the different types of saddle keys, their uses, advantages, and disadvantages, shedding light on their. The advantage of the design of the key is that there are relative axial motions possible between the. Because they're usually shorter than. It includes access to unique programming and opportunities for independent research and networking. Once the key is loose, use a small hammer or. (d) Woodruff keys. Woodruff keys work well near shaft shoulders and on tapered shafts. Work Shop Buddy Woodruff Key Metric Grab Kit (3 x 5 x 13 - 6 x 9 x 22m. However, they are difficult to. 3/8". Glad to know it is available at other places. 1. However, due to forskellige faktorer såsom. 2nd key too large (sometimes replacement keys are slightly too large and need to filed a bit for proper fit) the key when used for crank & flywheel is for indexing so that the flywheel is matched in position to the. Model # 302-080. This streamlined design allows for easier assembly, disassembly, and maintenance of the machinery or engine. Read More About: Woodruff Key : Types | Why Used | Advantages and Disadvantages. Woodruff keys are semicircular, such that, when installed, they leave a protruding flat end. Woodruff key: The woodruff key is an easily adjustable key. You can buy the Woodruff key at Sears but 65691 is no longer available. And while stretching the quads (which. It's employed in positive drive applications and can take various forms based on its shape and design, including rectangular sunk keys, square sunk keys, parallel sunk keys, gib-head keys, feather keys, and Woodruff keys. Material, heat treatment, hardness or finish is not within the scope of this standard. The right broker can work as an extension of your benefits team, guiding benefits decision-makers on choosing the right carrier and plan design, mitigating health insurance costs, staying updated on laws and legislation, and more. It accommodates itself to any taper in the hub or boss of the mating. 04 $ 12 . 8373 posts · Joined 2006. These keys are used to improve the concentricity of the shaft and the mating part, which is critical for high-speed operation. If a single node has “n” number of keys, then it can have maximum “n+1” child nodes. 6. Turned And Machined Parts. Here is a summary. A key attached to one member of a pair and which permits relative axial movement is known as feather key. Woodruff Machine Key 1/4" x 1-1/8" Alloy Steel Plain Key Number: 809Easy to make. In the case of the saddle key which is the first type of key in Machine Design, the function of resisting the relative motion and transmitting the torque is obtained by the friction between the key and the shaft. The comprehensive directory provides access to full contact and ability information for sourcing professionals, engineers and researchers wishing to get information on Woodruff Keys. Add to Shopping List. This key has flat bottom and semi circular shape. Mutual funds come with many advantages, such as advanced portfolio management, dividend reinvestment, risk reduction, convenience, and fair pricing. Splined shafts offer advantages that keyed shafts are unable to match, and without a major increase in price, too. The Woodruff nøgle is a small, semicircular metal piece that fits into en plads on the crankshaft and aligns with en tilsvarende spalte on the timing gear or pulley. This streamlined design allows for easier assembly, disassembly, and maintenance of the machinery or engine. 1884" wide. All industry standard Woodruff, HyPro, and NonRok key sizes are stocked and available for immediate shipment in two grades of steel; Special Carbon Steel (SAE 1035) and Heat Treated Alloy Steel (SAE. Made of Plain Finished Carbon Steel. As long as its tight it will hold. 21 by U. The disadvantages of the Woodruff keys are as follows :-. 3″ Long x 1/4″ Wide, Carbon Steel. Have a couple of questions: Why is there a Woodruff key instead of an ordinary key? and: Why is the key too wide for the pulley but fits fine in the shaft? Thanks in advance and. This key is largely used in machine tool and. Woodruff Key. The per capita income in Woodruff in 2018 was $0, which is low income relative to Arizona and the. This hub is capable of accommodating any taper in the keyway, 3. Follow the instructions step by step, you may do this without difficulty. Work Shop Buddy Machinery Key Metric Grab Kit (3 x 20mm - 6 x 40mm), 6. FAQs about Woodruff Keys. Graduates from Georgia Tech's programs work in virtually every industry thanks to their creativity and multidisciplinary skill sets. Working Principal of Woodruff Key. Using Woodruff keys offers several advantages in various applications. Shop online for woodruff key stocks. These woodruff keys are part of the Hillman Deep Drawer program. It's part of her series "America at a Crossroads. 4. Material:. Pages 10. Firstly, Woodruff keys provide a compact and efficient means of connecting rotating components to shafts without the need for additional fasteners or complex mechanisms. A lower debt load reduces. Technifast provide a varied range of keys including round end, square end and one round/one square end parallel keys (also known as feather keys), woodruff keys and gib head keys which are available in metric and inch sizes. This streamlined design allows for easier assembly, disassembly, and maintenance of the machinery or engine. The woodruff key is an easily adjustable key. Woodruff Key(4MM) About quality and texture Exactly 4mm high qualityAbout the feeling of use Only sp takegawa crankshaft paper was fittedProducts to buy together kitaco crankshaftDifficulty of installation easyCost performance and comparison with other products I couldn't find the sp takegwa part, so I can check mm and buy it enough, and the price is. This standard covers nomenclature, definitions, identification number, dimensions and tolerances of Woodruff Keys and Keyseats. Woodruff key is a semi-circular disc & fits into circulars recess in the shaft, which is machined by Woodruffs keyway cutter. In front perspective, it’s a portion of a cylindrical disc with a segmental cross-section. These woodruff keys are part of the Hillman Deep Drawer program. Steel construction. This is done with a simple design solution by using as the securing device a Woodruff key (7), conforming with DIN 6888, which is fitted in a suitably shaped recess (6) in the bottom (3) of the tappet (1). They have the advantage that their keyways may be drilled and reamed after the mating parts have been assembled. [1] The latter is particularly important for high speed operation. . Advantages of Woodruff Key: This is an easily adjustable key. Woodruff key. Home » Mechanical Engineering » Woodruff Key: Types, Working, Cutter, Advantages, Uses [PDF] Last Updated on: January 22, 2022 by Yousef In this article,. Arrow functions are anonymous functions i. 3/8". Crankshaft’s woodruff key has two main parts: the key. Package List: 10PCS 2x7x2. A feather key is a parallel key, which is fixed to the shaft or to the hub and which permits relative axial movement between them. Distribution management is the process used to oversee the movement of goods from supplier to manufacturer to wholesaler or retailer and finally to the end consumer. Woodruff keys are available in metric and imperial, carbon steel and stainless steel. functions without a name and are not bound by an identifier. The woodruff. These tabs mate with matching slots on the harmonic balancer flush upon the shaft. Using Woodruff keys offers several advantages in various applications. Performance Tool W5341 80pc Woodruff Key Assortment Metric #1 Best Seller . 1)In the extra depth of the keyway in the shaft increase stress concentration and reduces its strength. Backed by the assistance of our experienced professionals, we have been the best manufacturer and supplier of a qualitative range of Woodruff Key. Available in many different sizes and thicknesses; Conveniently packaged in a variety of piece counts to assist with both small and large projects; Easy to Install. Woodruff keyseat cutters are circular cutting tools made of high-speed steel, used by machinists for cutting seating in shafts for woodruff keys and, in some cases, keyways in fitting parts. All dimensions are given in inches. Woodruff keys are inserted into a key seat created by. It contains a taper of 1: 100 throughout its length. It can provide more precise fit while reducing movement in the key seat. This is one of the biggest e-commerce advantages. Buy products such as Dorman 595-059 Woodruff Key-Width-5/32(. However. All our Woodruff Keys are constructed of high-quality materials for long-lasting durability. Come to find out that the woodruff key that holds the impeller to the drive shaft was seized. The Woodruff key has some advantages over other types of keys. The main advantages of a woodruff key are as follows : 1. They are installed deep in a shaft and firmly embedded. $33. thru 3/4 in. 1. In an interview with Robert Pearl, MD, CEO of The Permanente Medical Group, he stated. Mate a shaft or part with a semi-circular cutout to another part with a longitudinal slot cutout. If you have questions about these feel free to give us a call on +44 (0)1384 634461. The George W. The key is then tightly fitted between the keyway and the keyseat, hence the mechanism is called a keyed joint. Specifications in Function, Form & Fit. then use a flat head screwdriver in place of a drift to knock the key out of the keyway from the end. Sometimes the. The main advantage of a Woodruff key is the elimination of milling near the shaft shoulders, where stress concentrations would be induced. While both approaches have their benefits and drawbacks, the best option depends on the specific use case and the goals of the system. The Nisorpa woodruff keys can be used in many ways. Woodruff key:- use in a tapered shaft in machine tools and automobiles. See the Picture of how the Woodruff key in an actual position. 8. Shearing of the Woodruff key can result in engine malfunction. It is a piece from a cylindrical disc having segmental cross-section in front view as shown in Fig. . Kennedy Key-The Kennedy key is made up of two square keys. Here are some key growing conditions for Sweet Woodruff: Soil: Sweet Woodruff prefers well-drained, moist soil that is rich in organic matter. Metric - 1. This key is largely used in machine tool and automobile construction. Length. Driven by more demanding customers, global competition, and slow-growth economies and industries, many organizations search for new ways to achieve and retain a competitive advantage. Gib Head Woodruff Key. Maybe file the end to smooth it out a little and deburr it. Arrow functions were introduced in the ES6 version. Types of Woodruff keys. Doing so is what over time causes a bike to run poorly and not have a definitive reason (other than a mish-mash of parts). Advantage: More Precise Fit Of The Key And Also Reduces Keyway Play And Stress Concentrations, And Improves The Reliability Of The Key. The thickness of the key is uniform. 5. Woodruff keys are semi-circular components that can withstand great strain. Firstly, Woodruff keys provide a compact and efficient means of connecting rotating components to shafts without the need for additional fasteners or complex mechanisms. Correct. Firstly, Woodruff keys provide a compact and efficient means of connecting rotating components to shafts without the need for additional fasteners or complex mechanisms. Mental health, or mental wellness, is essential to your overall health and quality of life. 2 16 45 12 19 - + n 19 n 25 28 - 0. The Hillman Woodruff Key is a semi-circular keys that is commonly used for mechanical applications. The key to successful marketing has always been about connecting with the target audience in the right place, at the right time. One of the primary decisions in selecting a primary key is whether to use a UUID or a sequential ID. Imperial - 1/6" x 1/4" - 3/4" x 3. The purpose of the key is to transfer the torque load from a shaft to the working gear. To DIN 6888. 8. A key element of CI management is giving senior officers early notification of incidents that have already escalated, or which are likely to escalate, into a CI. This half-moon woodruff key has a plain finish and a tensile strength of 72,000 PSI. First step: Take a woodruff cutter and with the help of this tool, press the woodruff key into the semi-circular groove that is crushed into the shaft. Oh well, let me know if this helps. Fig. bruges til at sikre or pulley, to a shaft, specifically a crankshaft, by fitting into a keyway. Its bottom circular part is hammered into the shaft and flat part is fixed into hub. My solution was to drill the shaft at the key way position to accommodate a shear bolt. We Also Offer Woodruff Key Assortments for Shops, Garages, & Fleets. CTP Woodruff keys are offered as semi-circle, square or rectangular, to fit many applications. Saddle Keys. x 3 1/2 in. 2. If the key won’t budge, use a pair of needle-nose pliers or a small pry bar to wiggle it loose. Using Woodruff keys offers several advantages in various applications. The main advantage of the Woodruff key is the elimination of milling near shaft shoulders, where stress concentrations, [4] and concentricity would be affected. culture, see what work's like, read reviews, and find job opportunities. zThe most common types of keys are the square and rectangular parallel keys. Also known as half moon keys. These can be used with gears or clutches. Saddle Keys. 2. 99 to PRECISION at $29. • A plain finished part is one that has not been treated or had a. PGP encryption uses a mix of data compression, hashing, and public-key cryptography. Material. The Woodruff key is simple and easily adjustable. Item # PPC302-080. I would hate to dump fresh oil and wait for another gasket. Steel Fabrication: Definition, Types, Parts, Uses, Methods, Benefits & Raw Materials. The feather key, shown below, allow the hub to slide over it (T orF) This problem has been solved! You'll get a detailed solution from a subject matter expert that helps you learn core concepts. It is a piece from a cylindrical disc generally of a semi-circle cross-section. Recipients receive 8 semesters of funding. Find professional buy woodruff key manufacturers and suppliers in China here! Welcome any of your inquiries and concerns for our products, we look forward to establishing a long-term business relationship with you in the near future. 5-7. The best way to get a stuck key out is to use a 1/8 drill and bore a hole in the center top flat part of the key. The advantages of Woodruff keys are as follows :- 1) The woodruff key can be used on the tapered shaft because it can align by slight rotation in the seat. They are used to improve the concentricity of the shaft and the mating part, which is critical for high speed operation. The seller of top 1 product has received honest feedback from 650 consumers with an average rating of 4. Full Radius woodruff key; Flat Bottom Woodruff Key; Hi-Pro Keys; Advantages of Woodruff Keys. The Woodruff Arts Center is home to three partners: Alliance Theatre, Atlanta Symphony Orchestra, and High Museum of Art. It is often used to encrypt and decrypt texts, emails, and files to increase the security of emails. Disadvantages of woodruff key : The extra depth of keyways in the shaft increases stress. Re: woodruff key, alternator , few quick questions. A more precise fit of the key and keyway also reduces play and stress concentrations and improves the reliability of the key. They are adjustable and can tilt in key seat or keyway. At Grob, we manufacture both industry standard spline shafts and custom spline shafts . x 3 1/2 in. Quantity: 80. Technical Drawing. The Woodruff sleutel is a small, semicircular metal piece that fits into een slot on the crankshaft and aligns with een overeenkomstig slot on the timing gear or pulley. Gib Head Sunk Keys #5. The woodruff key prevents slippage or misalignment, ensuring the proper timing and synchronization of engine parts. Dorman HELP! Woodruff Key -. Woodruff Keys A Woodruff Key is a half moon shaped key that is inserted into a curved slot in the shaft. The 66-piece stainless steel Woodruff key assortment includes Woodruff keys in various sizes and comes in a compartmented plastic case for storage and organization. Higher return on investment. But as the shaft and Woodruff Key are pressed into the component, the key tends to slip out of position. The purpose of the Woodruff key is to prevent the gear or pulley from rotating on the crankshaft,. This allows the key to withstand great strain and is not prone to rolling over in the key seat like ordinary machine keys. A woodruff key is capable of tilting in a recess milled out in the shaft by a cutter having the same curvature as the disc from which the key is made. Description. If knowledge is power, Woodruff is a pretty powerful place. Using Woodruff keys offers several advantages in various applications. Journal of the Academy of Marketing Science. These Woodruff keys can automatically adapt to the slope requirement. Steel with a tensile strength of 590 N/mm is. Dorman HELP! Woodruff Key -. Účel of the Woodruff key is to prevent zařízení or pulley from rotating on the crankshaft, ensuring. . Try tightening it with an impact. These type of keys are rarely used because these cannot transmit the high torque. What is the advantage of a woodruff key? The main benefit of Woodruff keys is that they don’t mill near the shaft shoulders, which would affect stress concentrations. Benefits Hub FSA and HSA Store Healthy Benefits OTC Network Medicare OTC Network Medicaid. Μετάβαση στο περιεχόμενο Securing a belt pulley to a drive shaft often seems like such a routine task, that engineers and mechanics can easily overlook some of the selection and installation factors required. A woodruff key is capable of tilting in a recess milled out in the shaft by a cutter having the same curvature as the disc from which the key is made.