Download Electric Motors (Workshop Practice) by Jim Cox PDF

By Jim Cox

This paintings bargains with the rules and features of every kind of electrical cars more likely to be utilized in modelling and small engineering workshops, including their purposes and operations. It covers themes equivalent to velocity keep watch over, electrical braking, and safeguard.

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Ant DEGREES OF EXACTITUDE attention to the and mark, FOR MUCH CARPENTRY, SUCH AS HOUSE by poorly fit•ing framing and general woodworking with two-bysimply fours and similar ftuff, measuring to the neardl li in. is usually sufficient. When a greater degree of niceness is needed it is common to hear carpentas express measurements as so and so ~am·· incba mel a 'fat' or 'thin' eighth. Sometun: mon: colorful expressions are ~ surbs mel a hair', or so many eigh mark such a normally To measure::; fa bl T H A IH T I 0 ~ A L W0 0 DW0 n~ lK B~ <3 li A • ' J) T 0 0 L S pencil is fine.

The board may be built up or rabbeted, and it may be held on the bench by a holdfast, between dogs, or in the vise by means of a keel attached to its underside. It may even be made adjustable with the addition of a sliding fence. Bridge clamping is another useful technique for awkwardly shaped pieces that cannot be otherwise held. The method consists of clamping a Stout bridge-piece on the work and on an equally thick auxiliary piece (see FIG. z6). Clamping picture frames is a branch of woodworking that has developed virtually its own • Joseph Moxon.

For centuries the common form was that of two wooden arms, one thicker than the other, fastened together to form a right angle (see FIG. 52). aquare but Handle (or stock) FlO. -.. When the tongue extends from the handle a tilted scribe may still mark a correct line ... whereby the thinner arm (often called the tongue or blade) is not let completely into the fatter arm (often called the handle or stock). Joseph Moxon, who, in 1678, wrote the firsr book in English on joinery, explained it thus: ...

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