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A surface plate is a solid, flat plate used as the main horizontal reference plane for precision inspection, marking out (layout), and tooling setup. [1] The surface plate is often used as the baseline for all measurements to a workpiece, therefore one primary surface is finished extremely flat with tolerances below 11.5 μm or 0.0115 mm per ...
Surface plate or marking out table — provides a true surface from which to work; Angle plates — assist in holding the workpiece perpendicular to the table; Scriber — is the equivalent of a pen or pencil. It literally scratches the metal surface leaving behind a fine, bright line; Height gauge or scribing block — allows lines to be ...
The acid bites into the surface of the plate where it was exposed. Biting is a printmaking term to describe the acid's etching, or incising, of the image; its duration depends on the acid strength, metal's reactivity, temperature, air pressure and the depth desired. [ 8 ]
Engraving is the practice of incising a design on a hard, usually flat surface by cutting grooves into it with a burin. The result may be a decorated object in itself, as when silver, gold, steel, or glass are engraved, or may provide an intaglio printing plate, of copper or another metal, [ 1 ] for printing images on paper as prints or ...
Designs in a syrupy solution of sugar or Camp Coffee are painted onto the metal surface prior to it being coated in a liquid etching ground or 'stop out' varnish. When the plate is placed in hot water the sugar dissolves, leaving the image. The plate can then be etched.
Once the main repoussé is done, the piece is again released by heating. The cavities on the back side, created by the repoussé work, are filled with melted pitch. Once that filling has hardened, the plate is again turned over and placed on top of a layer of softened pitch. Once the pitch has hardened, the design is then refined by chasing.
A scriber block is used to lay out lines at a set height from the base, thus its second name surface height gauge or just surface gauge. The workpiece is held against an angle plate so that it is perpendicular to the surface plate ; the scriber block is then adjusted to the required height and used to scribe a line parallel with the table, by ...
[citation needed] This method does not rely other flat reference surfaces or other precision instruments, and thus solves the bootstrapping problem of how to create the first precise flat surface. Up until his introduction of the scraping technique, the same three plate method was employed using polishing techniques, giving less accurate results.
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