Carpenter's and builder's math, plans, specifications by By (author) Rex Miller By (author) Mark R. Miller

By By (author) Rex Miller By (author) Mark R. Miller

A winning construction or home improvement activity calls for not just a plan, but additionally the ability to interpret it and an realizing of the maths in the back of it. This paintings permits you to discover the differing kinds of wooden items and study what's most sensible on your goal. It additionally is helping you discover ways to learn architectural drawings and paintings with computing device layout.

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They are used in installing various types of building hardware because of their great resistance to pulling out and because they are more or less readily removed in case of repairs or alterations. There are generally three standard types of screw heads: the flat countersunk head, the round head, and the oval head. All of these can be obtained in crossed slot, single straight slot, or Phillips slot. Lag screws or lag bolts are heavy-duty wood screws that are provided with a square or hexagonal head so that they are installed with a wrench.

Second, should you tire of an item at some time in the future; screws usually let you disassemble it without great travail. It is possible to damage the work if it is nailed together and you want to take it apart. These advantages cost more in the effort and time it takes to install screws. Screws are normally used to fasten things such as hinges, knobs, and so on, to structures, and in the assembly of various wood parts. Nails, Screws, Bolts, and Other Fasteners 17 They are not used in heavy building simply because, in this type of work, things are built so that there is a minimum of stress on the fasteners and the withdrawal resistance is not required.

Expansion Anchors Metal expansion anchors are unsuitable for use with plaster or gypsum board because they tend to crush the walls of the hole into which they are inserted, and then fall or pull out easily (assuming they can be tightened in place to begin with). Plastic expansion anchors (see Figure 1-28) are better in this regard, perform their best with radial loads, and are the poorest of any anchor on axial loads. A B C D Figure 1-28 Expansion anchors: (A) made from lead alloy for use with lag screws, (B) made from a softer lead alloy for use with wood screws, (C) made from plastic and best used with sheet-metal screws, and (D) made from fiber-jacketed lead—a plug-type anchor sized here for small wood screws.

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