Designing 'inside the box' with clinch hardware.* permits disassembly dis·as·sem·ble v. dis·as·sem·bled, dis·as·sem·bling, dis·as·sem·bles v.tr. To take apart: disassemble a toaster. v.intr. 1. * offers versatility Adhering to the principles of DFMA DFMA Design For Manufacturing and Assembly and DFS (Distributed File System) An enhancement to Windows NT/2000 and 95/98 that allows files scattered across multiple servers to be treated as a single group. With Dfs, a network administrator can build a hierarchical file system that spans the organization's LANs and , fastening and joining methods must deliver assembly efficiencies, ensure end-product integrity, and provide access to components when necessary. In the case of enclosures, attachment challenges arise, relating to relating to relate prep → concernant relating to relate prep → bezüglich +gen, mit Bezug auf +acc space limitations and subsequent service or replacement. Traditional "permanent" fastening methods, such as adhesives or welding welding, process for joining separate pieces of metal in a continuous metallic bond. Cold-pressure welding is accomplished by the application of high pressure at room temperature; forge welding (forging) is done by means of hammering, with the addition of heat. , do not allow for disassembly. Welding further causes undesirable fumes fumes odorous gases and other volatile materials; inhalation of irritating fumes causes coughing and, if sufficiently severe, irreversible pulmonary edema. and burn-outs and often requires complicated electrodes Electrodes Tiny wires in adhesive pads that are applied to the body for ECG measurement. Mentioned in: Electrocardiography and pilots that can stall production. Even some mechanical fasteners fasteners In construction, connectors between structural members. Bolted connections are used when it is necessary to fasten two elements tightly together, especially to resist shear and bending, as in column and beam connections. have drawbacks, such as sheet-metal screws with regards to reusability and holding power. Self-clinching fasteners offer performance and service advantages. They install quickly and permanently, minimize the need for additional hardware, and promote access and serviceability (system) serviceability - The ease with which corrective maintenance or preventative maintenance can be performed on a system (e.g. by a hardware service technician). Higher serviceability improves availability and reduces service cost. Serviceability is one component of RAS. . Dozens of types of self-clinching fasteners in more than 12,000 variations have been developed. For enclosures, they include: * Threaded Access Hardware. (a.k.a. panel fastener assemblies) Typically located and installed on an enclosure's exterior panel to enable subsequent access, heir captive screws reduce the number of parts to be handled during repair, while eliminating the risk of loose hardware falling into power supplies or circuitry. Most are spring-loaded and all are installed permanently to provide strong reusable threads for secure attachment. * Self-Clinching SNAP-TOP Standoffs. Without the use of screws or other threaded fastening hardware, they attach and space PC boards and subassemblies. Their spring action holds PC boards and subassemblies securely, with quick attachment and removal of boards or panels via a tool-less snap-on/snap-off action. * Self-Clinching KEYHOLE Standoffs. Without requiring tools, they attach a PC board or panel with a sideways slide, and can be used for spacing or hanging replaceable components. Typically, they are used with a standard threaded standoff stand·off n. 1. A tie or draw, as in a contest. 2. A situation in which one force neutralizes or counterbalances the other. 3. A standoff insulator. adj. Standoffish. , which accepts a screw to secure a board or component against any unwanted movement. * Self-Clinching Cable Tie-Mounts and Hooks. These types provide attachment points for mounting wires within enclosures. They install permanently without screws. Tie-Mounts permit ties to slide through the hardware's "eye" for fast cable mounting. The hook feature allows ties to remain intact and wires to remain wrapped when components are serviced. * Clinch Fasteners for Right-Angle Attachment. Designed to provide strong right-angle attachment points, these fasteners can serve as cost-effective alternatives to bent tabs at edges of sheets; bent tabs in the middle of sheets; bent flanges; right-angle brackets; tack welds; and loose hardware. Typically specified to hold the sides of a box in a rigid right-angle attachment, their particular external shape promotes other purposes. For instance, since mating screws can be inserted from either/both ends of these fasteners, a pair of PC boards can be mounted (and spaced) on each end; open-top types can be used to support and contain one edge of a PC board; and "mini-enclosures" in the corners of a box can be created. Every fastening decision can impact the early stages of enclosure and internal component design through to assembly and, ultimately, end-product performance. As a result, fastener suppliers have emerged as working partners during the design process. PennEngineering Fastening Technologies, Danboro, PA Circle 263, or www.rsleads.com/411df-263 [ILLUSTRATION OMITTED] |
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