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According to "ASME Y14.36M-1996 Surface Texture Symbols" (only since I don't have a copy of the better reference, "ASME B46.1-2009 Surface Texture" handy), surface roughness (commonly called "surface finish" or "surface texture") is specified and measured either in micrometers (or microns) or microinches depending on the primary dimensional units of the drawing (which are typically specified in millimeters or inches). You may also see surface finish listed as "Ra" for average roughness.
A micrometer (or micron) is one millionth (1/1,000,000) of a meter, and a microinch is one millionth of an inch. A value of 3.2 micrometers is considered equivalent to 125 microinches. More precisely, 1 microinch equals 0.0254 micrometers, or 1 micrometer equals 10.07874 microinches.
Some examples, of typical roughness (or surface finish) values in microinches, with micrometer equivalents in brackets [], are 125 [3.2] (typical for milled or drilled surfaces), 63 [1.6] (typical for turned or reamed surfaces), 32 [0.80] (typical for ground surfaces), 16 [0.40] (typical for honed surfaces), or 8 [0.20] (typical for polished surfaces).
All common average roughness (Ra) specifications, from roughest to smoothest, are listed below.
2000 [50]
1000 [25]
500 [12.5]
250 [6.3]
125 [3.2]
63 [1.6]
32 [0.80]
16 [0.40]
8 [0.20]
4 [0.10]
2 [0.05]
1 [0.025]
.5 [0.012]
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Why micrometer is a commonly used unit of surface roughness?
Micrometer is commonly used as a unit of surface roughness because it is a small unit of measurement that is well-suited for describing fine variations in surface texture. The micrometer provides a precise measurement that is useful in industries such as manufacturing and engineering where surface roughness is important for quality control and product performance.
What does Mft in a unit of weight?
Mft typically stands for "metric tonne force." It is a unit of force equal to the weight of one metric tonne (1000 kilograms) on Earth's surface. This unit is commonly used in engineering and physics to measure forces.
What resin is used for doming?
Epoxy resin is commonly used for doming to create a clear, bubble-like effect on surfaces like stickers, labels, or prints. The resin is poured onto the surface, then self-levels and cures to create a smooth and glossy finish.
Gram is the basic unit of what?
Gram is the basic unit of mass in the metric system. It is commonly used to measure the weight of objects and substances.
Is The horsepower unit is commonly used to indicate the power rating of household appliances?
false
Why micrometer is a commonly used unit of surface roughness?
Micrometer is commonly used as a unit of surface roughness because it is a small unit of measurement that is well-suited for describing fine variations in surface texture. The micrometer provides a precise measurement that is useful in industries such as manufacturing and engineering where surface roughness is important for quality control and product performance.
What tool is used for removing the rough or excess surface from a board?
A plane tool is used for removing the rough or excess surface from a board. This tool shaves off thin layers of wood to smoothen the surface. It is commonly used in woodworking to achieve a flat and even finish.
What are the differences between a trowel finish and a float finish when it comes to concrete work?
A trowel finish involves using a trowel to smooth and level the surface of the concrete, creating a glossy and polished look. A float finish, on the other hand, uses a float tool to create a slightly rougher texture on the surface of the concrete. Trowel finishes are typically used for indoor surfaces, while float finishes are more commonly used for outdoor surfaces.
What does Mft in a unit of weight?
Mft typically stands for "metric tonne force." It is a unit of force equal to the weight of one metric tonne (1000 kilograms) on Earth's surface. This unit is commonly used in engineering and physics to measure forces.
Does bevel finish gives a dull and rough effect?
A bevel finish typically provides a smooth and rounded edge to a surface, rather than a dull and rough effect. This type of finish is commonly used to soften the sharpness of edges and create a visually appealing look with a slight angle.
What is the name of a unit commonly used to measure time?
Minutes
Is the smallest commonly used linear unit?
Math and arithmetic
What is the basic unit of money?
The Tugrug is the most commonly used in Mongolia. Or it is the basic unit of money.
What monetary unit is used in China?
Renminbi The basic unit is the yuan, commonly called kwai.
What unit is used to measure surface temperatures of planets?
Kelvin
What is the unit of measurement most commonly used to compare masses?
grams
Unit used to measure volume of sound?
That is commonly measured in decibels.
