Technical pen

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technical pen is a special instrument used by engineers, architects, or conceptor to create a constant width for architectural, engineering, or technical drawings. "Rapidograph" is a trademarked name for one type of technical pen. Technical pens use refillable ink reservoirs (Isograph version) or replaceable ink cartridges.

Video Technical pen

History

The initial technical pens (the powerful pen) consist of a pair of small calipers, having one flat foot and one bowed leg holding the ink between them. By adjusting the distance between the legs, the width of the line drawn by the pen can be adjusted. Such pens, which are kept at a constant angle on paper, are used for the lines of power, but not for cursive handwriting, or for non-developing handwriting. The graphic pen Graphics introduced in 1934 downplayed the caliper principle and made the points easy to exchange. The Sheaffer company produces an expensive draft setting including a pen for use on linen prints. This set is often presented to the draftsman after completing the 'duty time', which marks the end of the apprenticeship.

Maps Technical pen

pen version

In the 1950s, pens with cylindrical points became available, but they were intricate instruments with tubes holding small shafts. To release the ink, the shaft is depressed and the line around the exterior diameter of the tube can be drawn. In addition, in the next model, the tube has a small ledge that effectively narrows the tip, which - while maintaining line thickness - keeps the tube thicker for most of its length and also protects ink from spill while drawing along the edges of the set-square -square or other templates (the ink does not have direct contact with the edge of the template). Some of the more expensive special nibs are equipped with tubes made of tungsten or with a tip made of synthetic gemstones, to slow down its wear on hard surfaces.

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Ink tube

In the 1960s, pen design evolved into an ink tube filled with a Pasteur pipette or from a narrow spout on a special ink bottle. Such pens often come in a variety of sizes, and some pen dots are attached to the holder which also contains a fountain filled, which in turn will be screwed into the handle. The construction and the number of parts vary depending on the company, and the parts are not compatible in most cases. Some later designs (such as the Staedtler MarsMatic700) have a specially designed channel to allow better airflow between external grip walls and point assemblies. This makes the ink flow more reliable. The common drawback of this pen group is that they have to be frequently and carefully cleaned to remove all ink from the tube, otherwise it will be set and can not be removed.

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Brand

In the United States, some companies produce technical pens like these: WRICO, Leroy, and Koh-I-Noor. Each has its own line of width, meaning that the width is not standardized across the industry, and the specifications of each company for the width are incompatible with the others. And the specification is given as inch shards instead of millimeter fractions. In the case of technical pens made for the US market, they are marked with symbolic expressions (4ÃÆ' â € "0, 3ÃÆ' â €" 0, 2ÃÆ' â € "0, 0, 1, 2, etc.) and standards. dimensional metrics in millimeters.

For the whole world, the best known brands are Staedtler, Rotring and Faber-Castell; Currently only Koh-I-Noor USA, Rotring, Rystor, Aristo, Staedtler and Trident Desegraph (from Brazil) are still making traditional technical pens.

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Technical information

The complete set of pens will have the following pen sizes: 0.13, 0.18, 0.25, 0.35, 0.5, 0.7, 1.0, 1.4, and 2.0 mm, corresponding to line width as defined in ISO 128. However, the International Organization for Standardization (ISO) is called for four pen widths and sets the color code for each: 0.25 (white), 0.35 (yellow), 0.5 ( brown), 0.7 (blue); This nib generates lines that are associated with different text text height and ISO paper size.

The text (produced by the ISO stencil template for use with a technical pen) with a height of 5 mm has a sharpness or a thickness of 0.5 mm line, requiring a 0.5 mm brown pen. If this text is used in an ISO-sized document (eg A0), and the document is reproduced half its original size (A1), the text will be given 3.5 mm with a 0.35 mm beam thickness - yellow-nib size. Thus, changes in the reduction or enlargement can be done easily because everything is proportional. This global standard (except Canada and the United States) ensures that images can always be read even after microfilming, photocopying, and faxing.

The main draft set of four nibs consists of two types: Gold and Silver. The Silver for rough tracing paper, and Gold is for plastic film (velograph or durable goods). The drawing board changes as a result of a technical pen - a hard surface (unlike a sponge) is required, and when plastic film is used, pull the static between the plastic cursor, the T-box, the set-box etc. Means that when one lifts the edge of the film, the film will rise through a static pull and the ink will blur. The solution is to stick a plastic sheet (Osalid) that pulls the film stronger than the stretching instrument. Tracing paper or velos sheets will be placed on Osalid sheets attached to the drawing board and brushed air. Brush filling the surface, and the film will then be fastened (but released at the end of each working day to allow overnight expansion and contraction).

As pen blocks become widespread, a wide variety of special points are produced. It has the basic characteristics of a standard pen pen, but the tube is much thicker to reinforce it against rapid lateral movement. Only the tip of the tube has the desired size line width. They fall unused because the plot is replaced with an ink-jet printer.

While the Rapidograph pen style is still widely used by artists, the use of computer-aided design (CAD) has replaced the need to create manual drafts. Also, the development of felt-tip, ink-based pens has provided cheaper, lower maintenance tools that sell much better than traditional technical pens.

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Picture tool

Technical drawing board drawing tools, such as set boxes, shape templates, text stencils and French curves are used to make consistent marks on paper. Technical pens can be attached to the compass to generate a circle.

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See also

• List of pens, brands and companies
• Stylus

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References

• Lutz, Ronald J. (1991). Applied Sketches and Technical Drawings. The Goodheart - The Willcox Company. ISBN: 0870067648
• "Technical Maintenance". Koh-i-noor Rapidograph, n.d . Retrieved 27 September 2012 .

Source of the article : Wikipedia