scraper tool – Amazon.com
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Hand scraper – Wikipedia
Three different engineering hand scrapers
Appearance of a slideway frosted for improved oil retention
An example of a finely scraped 6×1 inch standard
Close up of the surface showing the crossed scrape marks
End view showing the smoothness of the surface. For surfaces intended to be load bearing, “frosting” could then be applied on top of a surface like this if desired
A hand scraper is a single-edged tool used to scrape metal from a surface. This may be required where a surface needs to be trued, corrected for fit to a mating part, needs to retain oil (usually on a freshly ground surface), or to give a decorative finish.
Surface plates were traditionally made by scraping. [1] Three raw (plates that have been `seasoned` or residual stress relieved and received suitable surface treatments, but unfinished) cast surface plates, a flat scraper (as pictured at the top of the image) and a quantity of bearing blue (or red lead) were all that was required in the way of tools. [2]
The scraper in the center of the image is a three corner scraper and is typically used to deburr holes or the internal surface of bush type bearings. Bushes are typically made from bronze or a white metal.
The scraper pictured at the bottom is a curved scraper. It has a slight curve in its profile and is also suitable for bush bearings, typically the longer ones.
One advantage of scraping is the ability to take the tool to the workpiece, this can be useful when the workpiece weighs several tons and is difficult to move.
It is done by using a precision surface such as a surface plate or a straight edge as a standard (a straight edge in this context is not a ruler; it is a miniature surface plate of extreme accuracy). The standard is coated with a very thin coating of a material such as Prussian blue. The work piece and standard are touched together by gravity alone and the high spots on the work piece will be colored by the dye on the standard. These high spots are scraped off and the process repeated until there is an even spread of high spots which total about 60%[citation needed] or more of the surface area. Coarse scraping gives a resulting surface with 5-10 points per square inch while fine scraping yields 24-36 points per square inch. If desired the surface can then be “Frosted”. A surface prepared in this way is superior in overall accuracy to any prepared by machining or grinding operations, although lapping can equal or exceed it over small distances. [citation needed] Grinding and machining stresses the metal thermally and mechanically, scraping and lapping do not. [citation needed]
Scraping is the only method for producing an original set of flat surfaces from which one can transfer that accuracy through to other surfaces by means of grinding. [citation needed]Lapping and grinding do not achieve the long distance flatness scraping can, as they act on the entire surface rather than local high or low spots. [citation needed]
With precision ground surfaces, any oil film applied to the surface will lack the means to adhere to the surface, especially between two mating parts of exceptional finish. [citation needed] The oil film will be swept away leaving nothing but bare metal and the risk of seizure. Carefully scraping the surface will leave the original high quality surface intact, but provide many shallow depressions where the oil film can maintain its depth and surface tension. When scraping is used for this purpose it is more accurately called “frosting”, “spotting” or “flaking” as opposed to fully scraping an accurate surface. Typically a scraped surface is scraped to highly accurate flatness and then “frosting” is applied over it for oil retention. It is claimed[by whom? ] to stop the so-called “stick-slip” phenomenon where a machine member might move in a jerky fashion rather than moving smoothly, allowing vibration and chatter.
Such frosting will definitely increase oil retention but will also drastically reduce bearing area and capacity. [citation needed] There is no possibility of achieving hydrodynamic bearing performance on normal sliding machine ways. [citation needed] The velocity is far too low. Most of the time the ways will run under boundary lubrication conditions while at the highest speeds it might achieve mixed lubrication. [citation needed] This makes oil additives important in ways lubrication. However, this view is somewhat contradicted by the external link “Scraping methods”.
Hand scraping leaves a distinctive pattern on the surface that is scraped. This can be suggestive of a high level of precision in the ways, however, sometimes a surface can be marked to appear hand scraped, but it is really just a superficial surface treatment designed to give the impression of a scraped machine way.
Hand scraping can also be done by a power tool that has a reciprocating blade and is usually adjustable for stroke length and number of strokes per minute.
References[edit]
^ Moore 1970
^ Peregrin. “Metal Scraping Principles and Practice: A Working Guide”. Archived from the original on 19 April 2018. Retrieved 17 August 2018.
Bibliography[edit]
Moore, Wayne R. (1970), Foundations of Mechanical Accuracy (1st ed. ), Bridgeport, Connecticut, USA: Moore Tool Company, Inc., LCCN 73127307. Moore’s monograph is a seminal classic of the principles of machine tool design and construction that yield the highest possible accuracy and precision in machine tools. The Moore firm epitomizes the art and science of the tool and die maker.
External links[edit]
Scraping methods.
Hand Scraping Class.
History of metal scraping.
Scraper (kitchen) – Wikipedia
A kitchen scraper is a kitchen implement made of metal, plastics (such as polyethylene, nylon, or polypropylene), wood, rubber or silicone rubber. In practice, one type of scraper is often interchanged with another or with a spatula (thus scrapers are often called spatulas) for some of the various uses.
Bowl scraper[edit]
Long-handled scraper can be used as a bowl scraper
Bowl scrapers (also known as rubber feet) are, as the name suggests, used to remove material from mixing bowls. Often, a plate scraper is used for this purpose, particularly since the long handle allows it to be used to remove contents of bowls as well as jars, such as mayonnaise jars; however, for bowls, dedicated scrapers are available, lacking the handle, and consisting of a flat, flexible piece of plastic or silicone rubber sized for convenient holding with the palm and fingers, with a curved edge to match the curvature of the average bowl. The degree of curvature can vary from a slight curvature along one edge of a rectangle, to a complex shape composed of changing radii to adapt better to bowls of different sizes. Sometimes a hole is provided in one corner, to allow for hanging the utensil, as well as for placement of the thumb to allow for more secure grip. Prices vary from below one American dollar, to as much as $20 American.
The technique for use of either form of bowl scraper is essentially intuitive. [citation needed]
Dough scraper[edit]
Dough scrapers, or pastry scrapers, are more rigid implements, often made of a metal rectangle with a wooden, plastic, or metal handle running along one long edge not only for more comfortable grip, but also to add rigidity; some bowl scrapers, however, are designed to be stiff enough to serve a dual purpose and are sold as such. Occasionally, an implement resembling a putty knife is sold for this purpose.
This implement is used to manipulate raw dough, by scraping it from a surface on which it has been rolled, as well as to slice it. It can also be called a spatula. [citation needed]
A dough scraper is a tool used by bakers to manipulate dough and to clean surfaces on which dough has been worked. It is generally a small sheet of stainless steel (approximately 8 centimetres (3. 1 in) by 13 centimetres (5. 1 in)) with a handle of wood, plastic, or simply a roll in the steel blade along one of the long sides. [citation needed]
Bakers and pastry chefs use this tool to help pick up, turn, and portion dough. When finished, the dough scraper can be used to scrape up the little bits of dough that have dried onto the kneading surface during the forming process. It can also be used in a more generic kitchen role to transfer sliced or diced foods from cutting board to pan. Additionally, the scraper is also used by pastry chefs to give sharp and smooth edges to the cakes while decorating them. [1]
This tool is known by a variety of names, including dough scraper, dough cutter, dough knife, pastry cutter, bench scraper, board scraper, and bench knife. [citation needed]
Some modern varieties of this tool have handles of nylon or silicone and even feature both straight and curved edges. These are intended primarily for the use of scraping cutting boards and bowls rather than working dough. These uses have introduced further variants of the name, including terms such as bowl scraper or chopper, scooper, scraper. [citation needed]
Grill scraper[edit]
A grill scraper is a device used to clean cooking grills by scraping stuck particles of food from their surface. For flat surfaced grills, their design can vary from similar to a putty knife, to a more complex device with provision to protect the hands from the hot grill surface, targeted to professional cooks and chefs, to even more complex models. Varieties sold for cleaning wire grills are also available, with notches in the edge of the blade to match the wires of the grill. [citation needed]
Plate scraper[edit]
A plate scraper consists of a plastic, wooden, or metal handle attached to a flexible rubber head. Although the original use of the implement was to remove food from plates before washing, [2] its use has evolved to more of a utilitarian implement, the bowl scraper. [citation needed]
Pan scraper[edit]
A spatula may be used as a pan scraper
The pan scraper is, as the name suggests, an implement designed for the forcible removal of tightly stuck or burned food from the bottom of pots and pans before washing. They usually resemble a putty knife with a metal blade and a metal, wood, or plastic handle, sometimes with the handle mounted at an angle to the blade to allow for more vigorous scraping parallel to the surface; others, however, are a wedge shaped piece of hard plastic molded to fit the hand and with a slightly rounded sharp edge.
Shellfish scraper[edit]
A shellfish scraper is a specialized utensil used for removing meat from cooked shellfish at the dining table. It consists of a stainless steel rod about ten inches in length, with a flattened tip at one end and a forked tip at the other.
Crumb scraper[edit]
Although not a cooking utensil, a crumb scraper is used during a meal to remove crumbs and other unwanted small debris from the surface of table, for cleanliness. Although historically, when crumb scrapers were mostly used in homes, ornate designs were used, [3] the variety most often seen currently is sized and shaped for a waiter to carry in a breast pocket, and consists of a piece of sheet metal bent into a semi-cylindrical shape closely resembling a laboratory scoopula, which is dragged across the table so that the debris is dragged towards the edge, where it can be disposed of. [4]
Plastic scraper[edit]
Also known as Rubber Spatula. Because it’s flexible, you can scrape dough from the sides of the bowl without scratching it.
See also[edit]
Bottle scraper
Dough blender
Pastry blender
Spatula
References[edit]
^ “The secret to creating a showstopping cake”. The Independent. 2016-09-05. Retrieved 2019-01-28.
^ Plate Scraper, “Feeding America”
^ Crumb Scraper, “Feeding America”
^ Patent for a crumb scraper
External links[edit]
The dictionary definition of scraper at Wiktionary
Media related to scrapers at Wikimedia Commons
Frequently Asked Questions about scraper tool
What is a scraper tool used for?
A hand scraper is a single-edged tool used to scrape metal from a surface. This may be required where a surface needs to be trued, corrected for fit to a mating part, needs to retain oil (usually on a freshly ground surface), or to give a decorative finish. Surface plates were traditionally made by scraping.
What is a scraper tool called?
A kitchen scraper is a kitchen implement made of metal, plastics (such as polyethylene, nylon, or polypropylene), wood, rubber or silicone rubber. In practice, one type of scraper is often interchanged with another or with a spatula (thus scrapers are often called spatulas) for some of the various uses.
What is mean by scraping tool?
Web scraping is the process of using bots to extract content and data from a website. Unlike screen scraping, which only copies pixels displayed onscreen, web scraping extracts underlying HTML code and, with it, data stored in a database. The scraper can then replicate entire website content elsewhere.