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Marking out and measuring
Published in Andrew Livesey, Alan Robinson, The Repair of Vehicle Bodies, 2018
This is the most common tool for testing squareness and is used for internal and external testing to check whether work is square (Figure 6.5). It can also be used for setting out lines at right angles to an edge or surface. A try square consists of a stock and a blade, and these may be made separately and joined together, or the whole square may be formed from a single piece of metal. Squares are of cast steel, hardened and tempered and ground to great accuracy. The size of the square is the inside length of the blade. Engineers’ squares are made with a groove cut in the stock where the blade enters the stock; this allows for any burr on the edge of the metal being tested.
Lines and angles
Published in James Kidd, Ian Bell, Maths for the Building Trades, 2014
In building work the most commonly used set squares measure 90° or 45°. Figure 9.10 shows: A carpenter’s try square, used for setting out right angles and testing planed timber for square edges.An adjustable try square, which has both 90° and 45°.A builder’s square, which is usually made on site from 32mm × 100 mm timber and can be anything up to 2 metres in length.
Measuring and marking out
Published in Roger Timings, Fabrication and Welding Engineering, 2008
The engineer’s try-square is made with a thick stock and a thin blade so that a line may be scribed perpendicular to an edge. A sheet-metal worker will use a flat square of uniform thickness so that it can be laid on a sheet or plate with out rocking. Two examples are shown in Fig. 5.24. The one shown in Fig. 5.24(a) is fabricated from well seasoned hardwood for lightness in the larger sizes, whilst the hardened and tempered steel one shown Fig. 5.24(b) is normally used for small and medium sized work.
Recognizing the Correlation of Architectural Drawing Methods between Ancient Mathematical Books and Octagonal Timber-framed Monuments in East Asia
Published in International Journal of Architectural Heritage, 2023
In the same era, eight-cornered buildings were classified into those close to regular polygons and those with different side lengths. Both octagonal plans, with an error of approximately 1%, were prevalent. Moreover, it is significant that the Yingzao Fashi provided a guideline for drawing an almost square octagon using an integer multiple of 5:12:13 such that craftsmen could design a polygonal plane easily. Given the Yangshi Lei family’s efforts to make an accurate octagon, the proportions (1:2.4142:2.6131) were adjusted such that each side would be of the same length as much as possible. That is, the technique for making an octagon in the Yingzao Fashi is comparable to 1:2.4:2.6, calculated when the numerical value is adjusted based on 1 [Figure 4 and Figure 5]. Consequently, the method of drawing an octagon using the proportion of 5:12:13 mentioned in the Yingzao Fashi was developed to easily make a figure close to a regular octagon through integer multiples using a try square. However, the octagonal construction method devised by the Yangshi Lei family recognizes that Yingzao Fashi’s technique is not accurate relative to the Western method, and attempts to create more precise figures when applying the Yingzao Fashi method.