Marking blue: Difference between revisions
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A [[felt tip marker]] can be used as they are convenient and tend not to dry up as quickly; marking blue in the form of dye or ink has a tendency to dry in the containers and become unusable quickly.{{Citation needed|date=October 2009}} On rough structures, such as [[casting]]s or [[forging]]s, [[whitewash]] or a mixture of [[chalk]] and water can be used. A solution of [[copper sulfate]], [[distilled water]], and a few drops of [[sulfuric acid]] can be used on machined surfaces.<ref name="brink"/> This thin copper coating is more resistant to rough handling and the action of [[cutting fluid]].{{Citation needed|date=October 2009}} |
A [[felt tip marker]] can be used as they are convenient and tend not to dry up as quickly; marking blue in the form of dye or ink has a tendency to dry in the containers and become unusable quickly.{{Citation needed|date=October 2009}} On rough structures, such as [[casting]]s or [[forging]]s, [[whitewash]] or a mixture of [[chalk]] and water can be used. A solution of [[copper sulfate]], [[distilled water]], and a few drops of [[sulfuric acid]] can be used on machined surfaces.<ref name="brink"/> This thin copper coating is more resistant to rough handling and the action of [[cutting fluid]].{{Citation needed|date=October 2009}} |
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Prussian Blue is also used to mate two sliding surfaces. |
Prussian Blue is also used to mate two sliding surfaces. |
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==See also== |
==See also== |
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*[[Engineer's blue]] |
*[[Engineer's blue]] |
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Revision as of 23:29, 22 December 2018
Marking blue, layout stain or Prussian blue is a dye used in metalworking to aid in marking out rough parts for further machining. It is sometimes called Dykem (after a popular brand). It is used to stain or paint a metal object with a very thin layer of dye that can be scratched off using a scriber or other sharp instrument to reveal a bright, yet very narrow line in the metal underneath. The advantages are that any existing scratches are covered with the dye and the new lines have a contrasting background.
Marking blue is made by mixing methylated spirits with shellac and gentian violet.[1] This is not to be confused with the non-drying engineer's blue, made by mixing Prussian blue with oil or grease. Despite this, it is sometimes called engineer's blue, which can cause confusion.
Alternatives
A felt tip marker can be used as they are convenient and tend not to dry up as quickly; marking blue in the form of dye or ink has a tendency to dry in the containers and become unusable quickly.[citation needed] On rough structures, such as castings or forgings, whitewash or a mixture of chalk and water can be used. A solution of copper sulfate, distilled water, and a few drops of sulfuric acid can be used on machined surfaces.[1] This thin copper coating is more resistant to rough handling and the action of cutting fluid.[citation needed] Prussian Blue is also used to mate two sliding surfaces.
See also
References
- ^ a b Brink, C.; McNamara, B. (2008), Engineering Fabrication & Boilermaking, Pearson South Africa, p. 44, ISBN 978-1-77025-374-2.
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