(n) A form control for geometric dimensioning and tolerancing Flatness indicates that all points on the surface must lie in a plane Flatness for a planar surface is comparable to straightness for a line
Flatness, as defined by Federal Specification GGG-P-463c is: All points on the surface lie between two parallel planes, separated by 'X' distance, where 'X' is the overall flatness tolerance (paraphrased from para 3 3 4) This is a unilateral tolerance, not a plus/minus tolerance Occasionally, flatness will be defined as: deviation from a mean plane Tolerances stated in this way are plus & minus, as opposed to unilateral GGG-P-463c(USA): see: Specifications and Standards
For rolled products, a distortion of the surface of sheet such as a bulge or a wave, usually transverse to the direction of rolling Often described by location across width, i e , edge buckle, quarter buckle, center buckle, etc For extrusions, flatness (off contour) pertains to the deviation of a cross-section surface intended to be flat Flatness can be affected by conditions such as die performance, thermal effects and stretching
That property of a web which describes its ability to maintain a planar shape under no stress
A setting in PostScript illustration software Flatness controls the allowable laser beam error artwork is printed (A six sided STOP sign would be a good example of a circle with very high flatness ) To decrease output times increase the flatness setting A flatness setting of 3 will not be visible in the output but will shorten output time (Significantly!)
the peak-to-peak deviation from the nominal voltage in the passband of an amplifier Flatness is typically measured in dB For example, if an amplifier has a passband "ripple" of + 0 5dB, it is said to have a "flatness" of + 0 5dB
Flatness is a measure of a cut length sheet's ability to conform to a flat horizontal surface Maximum deviation from that surface is the degree to which the sheet is out of flat Flatness is often expressed quantitatively in either Steepness or I-Units
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