Make into near perfect feature to use as reference. It is because flatness will minimize the instability You control the surface with flatness, that particular surface is used as Want to control and also the size of the tolerance zone. You would need to refer to the drawing or specifications to determine the projection method.Geometric tolerance value is calculated based on the size of the feature you Write "No Machining Allowed" or "NMA" next to the symbol, along with the part number A340688.Ħ) The given information does not specify the projection method used in the drawing. You would need to refer to the drawing or specifications to determine the applicable tolerance for this dimension.ĥ) To place a no machining allowed symbol on the surface, you would use a circle with a diagonal line through it. Place this symbol next to the surface and write 0.005 next to it, along with the letter A to indicate Datum A.Ĥ) The tolerance applicable for dimension 1.00 is not provided in the given information. ![]() ![]() To indicate a flatness tolerance of 0.01 on the surface, you would place the flatness symbol next to the surface and write 0.01 next to it.Ģ) The hole callout for a 0.50 diameter hole with a blind depth of 0.26 would be written as "Ø0.50 - 0.26" next to the hole on the drawing.ģ) To indicate perpendicularity of the surface within 0.005 with Datum A, you would use the perpendicularity symbol, which looks like a vertical line with a small circle at the end. 1) The GD&T symbol for flatness is a flatness symbol, which looks like a horizontal line with two parallel lines on top and bottom.
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