The O-ring inner diameter (ID) should also stretch approximately 5% over your groove or gland. Browse design considerations and recommendations for static face seals, metric o-rings, static dovetail o-rings, static rod-piston o-rings and dynamic rod-piston o-rings. Surfaces and corners must be free of tool marks and scratches. However, this is an expensive groove to machine, and thus should be used only when absolutely necessary. They are mainly used by attaching them to milling machines and machining center processing machines. Secondly, the o-ring is at its smallest cross-section tolerance limit and the gland is at its largest size tolerance limit. However, when designing the groove, it’s necessary to look at the two extreme cases. Many design elements can be used to address extrusion issues in sealing design. A flange or face seal is static and will not have a gap between surfaces, eliminating any design issues associated with extrusion. Review the general o-ring groove design considerations before moving onto the specific o-ring gland design type. These o-ring groove design guides offer default dimensional guidance for basic o-ring groove design applications. A dovetail face seal is a special static gland designed to retain the o-ring in the groove. O-ring Cross Section W = 1/8 nominal Static application No back-ups required. The design tables displayed above were created using best practices, including Compression Ratio, O-Ring Extrusion, Concentricity and Diametric Gap, and Backup Rings. O-ring grooves are high-speed steel or carbide cutters used for O-ring groove machining. These are intended for use in basic design consideration and to understand the core principles involved in o-ring gland/groove design. We carry a full range of AS568 standard sizes, as well as metric sizes and O-Ring cord stock. A groove machining tool is given a convex curved end surface the radius of which is slightly less than or, at most, substantially equal to the tightest concave radius that the end surface will have to sweep through as the groove is cut. A static gland seal is used when two mating components have a designed gap between surfaces. Fax: 832-448-5551 Typically used in static or slow moving applications the dovetail o-rings gland purpose is to properly hold the o-ring in place during machine operation. How to cut a O-ring groove? ¿Hablas español? Most machine shops will use either a horizontal mill or a lathe that is equipped with a four-jaw chuck and a steady rest. Many conventional methods for machining seal ring grooves have poor process security and slow down production. Clearances shown are based on 70 durometer values. Terms & Conditions. This is the most straightforward of groove designs. Available in OD and face-grooving styles, the inserts feature a 7-degree included angle and are available in two grades of submicron carbide. A method for cutting an "O" ring retention groove around the cutting edge of a hydropiercing die button. An undercut or dovetail groove has proven beneficial in many applications to keep the o-ring in place. The o-ring cross-section in your design will determine all your subsequent dimensions and specifications. International O-Ring Size Cross Reference Table, the elements involved in o-ring pressure tolerance, click here, Most cost-effective if the design uses expensive elastomers such as, Smaller required squeeze to create a seal which reduces compression set issues, Greater tolerances variations in the machined groove while maintaining acceptable compression squeeze. Our guidelines start with the nominal (or stated) dimension, then incorporate tolerances of the design elements to provide the correct basis for designing the gland/groove. An undercut or dovetail groove has proven beneficial in many applications to keep the o-ring in place. Go. Note 1. They are mainly used by attaching them to milling machines and machining center processing machines. O-ring grooves are high-speed steel or carbide cutters used for O-ring groove machining. Designed for internal pressurization of O-ring grooves. by machining the part on a lathe, or by some other method that produces scratches and ridges that follow the direction of the machinehead, a very rough surface will still seal effectively. O-ring Cross Section W = 3/32 nominal With a smaller cross-section there is less machining required for machined grooves since the groves are smaller. Standard o-rings are available in various cross-sections and inside dimensions (ID). 14450 John F Kennedy Blvd Backup rings are made of thin, hard plastic materials such as Nylon, PTFE, and PEEK. (For O-Ring Nominal Number P). Nosotros también. Existing conventional plunging and radial turning tools need to perform roughing and finishing in multiple operations, and they involve high cutting forces with limited tool life. New to O-Ring grooves. We’ll respond to your request within 1 business day. The addition of backup rings should be incorporated in the fill calculation for determining the groove width. Lastly, the fourth table is for dovetail groove design. To find the minimum area necessary, calculate the total volume of the o-ring which creates the rectangle to hold that volume. The gland retaining the o-ring has a rectangular area. Once you find the right o-ring groove design you can easily order online from the world's largest o-ring inventory network. Global O-Ring and Seal has developed o-ring groove design and gland dimension guidelines. A dynamic gland seal is used when two mating components are moving in relation to each other while maintaining a seal. If the pressure is from both directions, it’s recommended a backup ring be placed on both sides of the o-ring. Dynamic application My Account In the sealing design, unless the bore and piston (or rod) are ensured to remain concentric by bearings, it must be assumed that all the gap possible can shift to one side. ©2021 Global O-Ring and Seal, LLC. General purpose dovetails are used to undercut or deburr features in a workpiece. Checkout Static application Registered. This design is beneficial when the seal is opened and closed during use. DAN_IN_MN Active User. They are mainly used by attaching them to milling machines and machining center processing machines. These factors include room for thermal expansion, swell due to fluid exposure, and the effect of tolerance variations in the machined groove and molded o-ring. O-rings are the epitome of elegant engineering: The ring itself costs only a few cents, and the groove it goes in is simple and easy to manufacture. No back-ups required, O-ring size = AS-568-112 (1/2 ID x 3/32 W nominal dimensions), Gland depth F = .090 +.000 -.001 (from chart), Groove width G = .144 +/-.003 (from chart), Rod Gland D = C + 2F = .500 + 2 x .090 = .680, Cylinder Bore A = 1.000 O-ring groove design guides offer default dimensional guidance on the most basic o-ring groove design applications. Dovetail grooves are used to hold the O-ring in-place on a face seal groove during during assembly and maintenance of equipment. The ID or OD of the o-ring should be sized to create some interference, per the guidelines below: Below, four standard application groove design guidance tables are presented along with dimensional reference drawings. Dovetail grooves are used to hold the O-ring in-place on a face seal groove during during assembly and maintenance of equipment. As important as the o’ring seal itself is the groove that the o’ring seats into. Dovetails are typically used to cut O-ring grooves in fluid and pressure devices, industrial slides and detailed undercutting work. O-ring grooves are high-speed steel or carbide cutters used for O-ring groove machining. Moderators: Harold_V, websterz, GlennW. In the calculation above, we used the nominal (or stated) dimensions. There will always be a gap between the two surfaces. Thanks for the link. Simply cut out a circular groove into one of the plates and leave the other plate completely flat, the groove will have a square/trapezoidal cross section and the dimensions are conveniently already calculated and laid out in tables in the Parker O-ring Handbook. Smaller required squeeze to create a seal which reduces compression set issues; Greater tolerances variations in the machined groove while maintaining acceptable compression squeeze ; ID/OD Interference. Whats happening up there in MN? Global O-Ring and Seal, LLC is a master distributor of O-Rings, Backup Rings, X-Rings, Cord Stock, and related seals, servicing industrial distributors worldwide. The second table is for static industrial radial applications. If you have a custom O-ring size that does not appear on this chart, contact us directly and we can help you size your O-ring gland design accordingly. Learn how to handle challenges when machining API seal ring grooves. There are cutter shapes that machine the O-ring shape by plunging, and cutter shapes that machine grooves transversely. O-ring Cross Section W = 1/8 nominal The four-jaw chuck and steady rest is used because of the need to center the cylinder assembly in the lathe when machining the different cylinder end cap configurations. If the maximum allowable gap is decreased through alignment/bearings, this allows for an increase in pressure for the same o-ring. Backup rings work by covering the existing gap. Extrusion is a concern for radial seals where a designed gap exists between moving components: Either the piston and bore, or the rod and bore. Houston TX, 77032 A method for cutting an "O" ring retention groove around the cutting edge of a hydropiercing die button. If the trade-offs of gap design and durometer do not work, the use of backup rings are recommended to overcome extrusion issues. Has a rectangular area machining o-ring grooves a face seal is opened and closed during.... Dovetail face seal groove during during assembly and maintenance of equipment features in a workpiece of.... Applications to keep the o-ring has a rectangular area and seal has developed groove... Work, the fourth table is for dovetail groove has proven beneficial in many to... Standard sizes, as well as metric sizes and o-ring cord stock backup should! Processing machines various cross-sections and inside dimensions ( ID ) and slow down production % over your or! 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