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Dowel Pin
The dowel is a cylindrical shape made of wood, plastic, or metal. In its original manufactured form, a dowel is long and called a ''dowel rod'', which are often cut into shorter ''dowel pins''. Dowels are commonly used as structural reinforcements in cabinet making and in numerous other applications, including: * Furniture shelf supports * Moveable game pieces (i.e. pegs) * Hangers for items such as clothing, key rings, and tools * Wheel axles in toys * Detents in gymnastics grips * Supports for tiered wedding cakes Wood dowel Manufacturing process The traditional tool for making dowels is a ''dowel plate'', an iron (or better, hardened tool steel) plate with a hole having the size of the desired dowel. To make a dowel, a piece of wood is split or whittled to a size slightly bigger than desired and then driven through the hole in the dowel plate. The sharp edges of the hole shear off the excess wood.Ivin SickelsExercises in Wood-Working American Book Company, 1889; see Ex ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hydraulic Pressure
Hydraulics () is a technology and applied science using engineering, chemistry, and other sciences involving the mechanical properties and use of liquids. At a very basic level, hydraulics is the liquid counterpart of pneumatics, which concerns gases. Fluid mechanics provides the theoretical foundation for hydraulics, which focuses on applied engineering using the properties of fluids. In its fluid power applications, hydraulics is used for the generation, control, and transmission of power by the use of pressurized liquids. Hydraulic topics range through some parts of science and most of engineering modules, and they cover concepts such as pipe flow, dam design, fluidics, and fluid control circuitry. The principles of hydraulics are in use naturally in the human body within the vascular system and erectile tissue. ''Free surface hydraulics'' is the branch of hydraulics dealing with free surface flow, such as occurring in rivers, canals, lakes, estuaries, and seas. Its ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spring Pin
A spring pin (also called tension pin or roll pin) is a mechanical fastener that secures the position of two or more parts of a machine relative to each other. Spring pins have a body diameter which is larger than the diameter of the hole they are intended for, and a chamfer on either one or both ends to facilitate starting the pin into the hole. The spring action of the pin allows it to compress as it assumes the diameter of the hole. The force exerted by the pin against the hole wall retains it in the hole, therefore a spring pin is considered a self retaining fastener. Spring pins may be used to retain a shaft as a journal in a plain bearing, as a type of key to fasten one shaft to another, or to precisely fasten flat faces of mating parts together through symmetric hole locations. Types There are two types of spring pins: ''slotted spring pins'' and ''coiled spring pins''. Coiled spring pins A coiled spring pin, also known as a ''spiral pin'', is a self retaining enginee ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rebar
Rebar (short for reinforcement bar or reinforcing bar), known when massed as reinforcing steel or steel reinforcement, is a tension device added to concrete to form ''reinforced concrete'' and reinforced masonry structures to strengthen and aid the concrete under tension. Concrete is strong under compression, but has low tensile strength. Rebar usually consists of steel bars which significantly increase the tensile strength of the structure. Rebar surfaces feature a continuous series of ribs, lugs or indentations to promote a better bond with the concrete and reduce the risk of slippage. The most common type of rebar is carbon steel, typically consisting of hot-rolled round bars with deformation patterns embossed into its surface. Steel and concrete have similar coefficients of thermal expansion, so a concrete structural member reinforced with steel will experience minimal differential stress as the temperature changes. Other readily available types of rebar are manufacture ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kinematic Coupling
Kinematic coupling describes fixtures designed to exactly constrain the part in question, providing precision and certainty of location. A canonical example of a kinematic coupling consists of three radial v-grooves in one part that mate with three hemispheres in another part. Each hemisphere has two contact points for a total of six contact points, enough to constrain all six of the part's degrees of freedom. An alternative design consists of three hemispheres on one part that fit respectively into a tetrahedral dent, a v-groove, and a flat. Background Kinematic couplings arose from the need of precision coupling between structural interfaces that were meant to be routinely taken apart and put back together. Kelvin Coupling The Kelvin coupling is named after William Thompson (Lord Kelvin) who published the design in 1868–71. It consists of three spherical surfaces that rest respectively on a concave tetrahedron, a V-groove pointing towards the tetrahedron and a flat plat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fastener
A fastener (US English) or fastening (UK English) is a hardware device that mechanically joins or affixes two or more objects together. In general, fasteners are used to create non-permanent joints; that is, joints that can be removed or dismantled without damaging the joining components. Steel fasteners are usually made of stainless steel, carbon steel, or alloy steel. Other methods of joining materials, some of which may create permanent joints, include: crimping, welding, soldering, brazing, taping, gluing, cement, or the use of other adhesives. Force may also be used, such as with magnets, vacuum (like suction cups), or even friction (like sticky pads). Some types of woodworking joints make use of separate internal reinforcements, such as dowels or biscuits, which in a sense can be considered fasteners within the scope of the joint system, although on their own they are not general-purpose fasteners. Furniture supplied in flat-pack form often uses cam dowels lock ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dowel Bar Retrofit
A dowel bar retrofit (DBR) is a method of reinforcing cracks in highway Pavement (material), pavement by inserting steel dowel bars in slots cut across the cracks. It is a technique which several U.S. states' departments of transportation have successfully used in repairs to address faulting in older jointed plain concrete pavements. The typical approach is to saw cut and jackhammer out the slots for the dowels. Following dowel placement the slots are then typically backfilled with a grout, non-shrink concrete mixture, and the pavement is diamond-ground to restore smoothness. History As a vehicle travels on jointed concrete roads the weight of the vehicle passes from one concrete panel to the next. As the vehicle traverses the joints its weight is placed on the edge of the panel, where the panel is least able to withstand the deflection force. This can cause cracks as pavement shears off the edge of the panel. On older highways built in the early-to-mid 20th century, dowel bars ( ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Butt Joint
A butt joint is a joinery, wood joint in which the end of a piece of material is simply placed (or “butted”) against another piece. The butt joint is the simplest joint. An unreinforced butt joint is also the weakest joint, as it provides a limited surface area for gluing and lacks any mechanical interlocking to resist external forces. Nonetheless, it generally provides sufficient strength in most cases, particularly when fasteners are used. Additional reinforcement through Tie (engineering), ties and plates is often used to improve the characteristics of butt-jointed structures. The joint is widely used in many applications due to its simplicity, notably in rough carpentry and construction. Methods There are several types of butt joint based on the orientation of the pieces being joined. These include the T-butt, end-to-end butt, Miter butt and edge-to-edge butt. The T-butt joint is a very simple joint to construct. Members are simply docked (cut off) at a right angle and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Barrel Nut
:''On some firearms the gun barrel is fastened to the receiver with a nut, referred to as a barrel nut.'' A barrel nut (also known as steel cross dowel or dowel nut) is a specialized forged nut, and is commonly used in aerospace and ready-to-assemble furniture applications. It is used to bolt thin sheet metal parts to larger, often billet or forged, parts. The barrel nut is a round slug, or formed sheet metal part with threads perpendicular to the length of the nut. The nut sits in a hole inside the forging and a standard bolt is threaded into the barrel nut from outside the sheet metal. They are preferred over a standard nut and bolt, because they do not require a flange to be machined or forged onto the receiving part, thus reducing weight. Furniture cross dowel barrel nuts are cylindrical shaped metal nuts (metal dowels) used with furniture connector bolts to join two pieces of wood. The inside threaded hole is unusual in that it passes through the sides of the dowel. To ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bar Stock
Bar stock, also (colloquially) known as blank, slug or billet, is a common form of raw purified metal, used by industry to manufacture metal parts and products. Bar stock is available in a variety of extrusion shapes and lengths. The most common shapes are round (circular cross-section), rectangular, square and hexagonal. A bar is characterised by an "enclosed invariant convex cross-section", meaning that pipes, angle stock and objects with varying diameter are not considered bar stock. Bar stock is commonly processed by a sequence of sawing, turning, milling, drilling and grinding to produce a final product, often vastly different from the original stock. In some cases, the process is partially automated by specialized equipment which feeds the stock into the appropriate processing machine. Process and types Most metal produced by a steel mill or aluminium plant is formed (via rolling or extrusion) into long continuous strips of various size and shape. These strips are c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bible (Wycliffe)/3 Kings
The Bible is a collection of religious texts that are central to Christianity and Judaism, and esteemed in other Abrahamic religions such as Islam. The Bible is an anthology (a compilation of texts of a variety of forms) originally written in Hebrew, Aramaic, and Koine Greek. The texts include instructions, stories, poetry, prophecies, and other genres. The collection of materials accepted as part of the Bible by a particular religious tradition or community is called a biblical canon. Believers generally consider it to be a product of divine inspiration, but the way they understand what that means and interpret the text varies. The religious texts were compiled by different religious communities into various official collections. The earliest contained the first five books of the Bible, called the Torah in Hebrew and the Pentateuch (meaning 'five books') in Greek. The second-oldest part was a collection of narrative histories and prophecies (the Nevi'im). The third coll ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wycliffe's Bible
Wycliffe's Bible (also known as the Middle English Bible ''MEB Wycliffite Bibles, or Wycliffian Bibles) is a sequence of orthodox Middle English Bible translations from the Latin Vulgate which appeared over a period from approximately 1382 to 1395. Two different but evolving translation branches have been identified: mostly word-for-word translations classified as Early Version (EV) and the more sense-by-sense recensions classified as Later Version (LV). They are the earliest known literal translations of the entire Bible into English (Middle English); however, several other translations, probably earlier, of most New Testament books and Psalms into Middle English are extant. The authorship, orthodoxy, usage, and ownership has been controversial in the past century, with historians now downplaying the certainty of past beliefs that the translations were made by controversial English theologian John Wycliffe of the University of Oxford directly or with a team including John P ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
