The book rack set out in isometric projection (336) is turned into an orthographic drawing. A system is used that employs the undermentioned basic principles.
1 Most furniture is symmetrical about an axis, normally the centre line. Therefore often one half only will provide sufficient information.
2 Where a piece has a feature repeated more than once, to draw in full detail once is sufficient.
3 The craftsman's prime interest is how the component parts are joined together. Provided the length of the component is clearly indicated, it is the joints and the intersections between pieces that really matter.
4 A drawing such as figure 337 is intended for workshop use only, and can be written on, sketched on, and used as a visual diary of ideas.
5 Where the drawing is made in the workshop by the craftsman for his own use (337), labelling and lettering can be kept to a minimum.
On the example shown (337), the draughtsman should proceed as follows:
1 Draw a full size front elevation in outline, symmetrical about a centre line.
2 Using the heights already indicated, draw the end elevation in the position shown.
It is now possible to measure from the drawing the following information:
1 Overall length(s) 6 Width of back rail
2 Overall height 7 Thickness of bottom
3 Height of end 8 Thickness of ends
4 Width of end 9 The length, width
5 Position of back rail and thickness of foot. By turning the end elevation into a section the thickness of the back rail can be indicated.
If the right-hand end of the drawing is left as it is, it will show the front elevation as it will be seen.
If the left hand of the elevation is referred to as the view from the back it can be shown how the back rail is joined to the ends.
Information is needed on the joint between the ends and the bottom. By superimposing part of an inverted plan on the end, the setting out of the joint involved can be shown.
The positions of the slot screws retaining the feet are also shown.
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