Whatever given outside the brackets is applicable for the whole drawing except the surfaces where surface finish mentioned particularly (those are mentioned within brackets). If you look at the drawing,whatever given within brackets(Ra 3.2,Ra 6.3) will be mentioned in the drawings surfaces also..Other than those surfaces,entire surface of the part's finish will be Ra50
Roughness is Ra Value.the smallest closely spaced irregular variation occuring in surface texture. Flatness is the variation allowed on surface with respect to a datum surface. More or less,they both mean the same only difference is datum....the point of measurement. Roughness is magnified version of flatness
Roughness is the assessment of irregularities present on a test surface or the extent of surface finish achieved through a particular type of machining operation. It is usually measured in samples of 0.025mm, 0.08mm, 0.25mm, 0.5mm and so on. It is found to study about the aesthetic appearance of a surface, retentivity of the surface for lubrication, adhesion, dyeing of ink(pen marks on papers.. you call it as quality of the paper), how go a paint can stick to a surface like metal surface, wall, canvas, paper etc. Roughness studies in automobile parts are very important to assess the performance of an engine. Say the cylinder bore surface, should have considerable roughness in the form of peaks and valleys(assume in 3D) inorder to retain the sprayed lubricants for good lubrication of the surface for the piston movement. Slope of the Peaks help the lubricant to get washed and fill the valleys, valleys serve as the compartment for the lubricant to be retained... infact all these happens in fraction of a second. Please go in this direction to know more about roughness. flatness is for a area of larger size... say for example a cylinder head, granite table, straigh edges and other surfaces in broader context. It is an extension of straightness measurement.. Straighness measurement is along a straight line.. and flatness measurement is for a rectangular, square and other polygonal areas... Flatness tells us how flat a surface is....in other words whether the surface deviates from being flat.. viz concavity, convexity, obligue, rounded surfaces, contour surface, etc... To give u a quick idea about roughness. Roughess is quantifying what you feel when u run your pad of the finger on a surface like a brick. Flatness is like how good your floor or wall of a room in your house or elsewhere is finished.... Hope you get a glimpse of the idea. best of luck
Watch in 1.25x
Watched it at 1.75 x bro
@@wayneedgaralphonso6675 2X
great
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Thank you.
Is the surface roughness results in reduction in the magnitude of reflection coefficitiont ??
Where we apply Surface roughness value given in brackets in title block of drawing like this Ra50 ( Ra6.3, Ra 3.2 ). Explain it plz
Whatever given outside the brackets is applicable for the whole drawing except the surfaces where surface finish mentioned particularly (those are mentioned within brackets).
If you look at the drawing,whatever given within brackets(Ra 3.2,Ra 6.3) will be mentioned in the drawings surfaces also..Other than those surfaces,entire surface of the part's finish will be Ra50
Explain primary and secondary texture??
Is it possible to get the content/transcript of this lecture?
what is difference between roughness and flatness
Roughness if rough, flatness is flat! :p
@@notyourdad361 roughness means Ra value and flatness relation?
Roughness is Ra Value.the smallest closely spaced irregular variation occuring in surface texture.
Flatness is the variation allowed on surface with respect to a datum surface.
More or less,they both mean the same only difference is datum....the point of measurement.
Roughness is magnified version of flatness
Roughness is the assessment of irregularities present on a test surface or the extent of surface finish achieved through a particular type of machining operation. It is usually measured in samples of 0.025mm, 0.08mm, 0.25mm, 0.5mm and so on. It is found to study about the aesthetic appearance of a surface, retentivity of the surface for lubrication, adhesion, dyeing of ink(pen marks on papers.. you call it as quality of the paper), how go a paint can stick to a surface like metal surface, wall, canvas, paper etc. Roughness studies in automobile parts are very important to assess the performance of an engine. Say the cylinder bore surface, should have considerable roughness in the form of peaks and valleys(assume in 3D) inorder to retain the sprayed lubricants for good lubrication of the surface for the piston movement. Slope of the Peaks help the lubricant to get washed and fill the valleys, valleys serve as the compartment for the lubricant to be retained... infact all these happens in fraction of a second. Please go in this direction to know more about roughness.
flatness is for a area of larger size... say for example a cylinder head, granite table, straigh edges and other surfaces in broader context. It is an extension of straightness measurement.. Straighness measurement is along a straight line.. and flatness measurement is for a rectangular, square and other polygonal areas... Flatness tells us how flat a surface is....in other words whether the surface deviates from being flat.. viz concavity, convexity, obligue, rounded surfaces, contour surface, etc...
To give u a quick idea about roughness. Roughess is quantifying what you feel when u run your pad of the finger on a surface like a brick. Flatness is like how good your floor or wall of a room in your house or elsewhere is finished.... Hope you get a glimpse of the idea. best of luck
flatness is at macro level... deviation in third dimensions, where as rouhness is mircro level ... irregularities on surface
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