What is a profile line?
[¦prō‚fīl ‚līn] (geology) The top line of a profile section, representing the intersection of a vertical plane with the surface of the ground.
What is a profile line definition?
Profile of a line describes a tolerance zone around any line in any feature, usually of a curved shape. Profile of a line is a 2-Dimensional tolerance range that can be applied to any linear tolerance.
What is profile measurement?
Overview. Profile measurement systems measure and record the profile of a target by tracing the surface of the target using a stylus. Some instruments can even be used as surface roughness meters. These instruments are ideal for measuring minute shapes such as screw threads and thin films in the order of micrometers.
How do you measure a profile?
Profile is usually measured using a CMM due to the complexity of some of the surfaces that are called out. The CMM would compare the 3D scan of the profile to the dimensions called out on the drawing to see if it was in spec.
What does U mean in GD?
unequally disposed profile
How is flatness measured?
In application, one way to physically measure flatness is to use a height gage, as we can see in Figure 2. To use the height gage correctly, the part to be measured is first placed upon 3 columns with adjustable heights. Then, the height gage is run across the surface while looking at the amplitude of the needle.
What is the flatness symbol?
GD Flatness is a common symbol that references how flat a surface is regardless of any other datum’s or features. The flatness tolerance references two parallel planes (parallel to the surface that it is called out on) that define a zone where the entire reference surface must lie.
What are the two ways straightness is applied?
Straightness can apply to either a flat feature such as the surface of a block, or it can apply to the surface of a cylinder along the axial direction.
How do you calculate straightness?
Using a Height Gauge Secure the target so that the height is evenly matched on the left and right, using small jacks in order to prevent the target from tilting. Move the target or the height gauge straight to measure the straightness. The difference between the maximum and minimum values (△H) is the straightness.
What does straightness mean?
1. Extending continuously in the same direction without curving: a straight line. 2. Having no waves or bends: straight hair.
What is the tolerance of straightness of a line?
The straightness tolerance is the maximum acceptable linear dimension, t, of the tolerance zone where the line location must be considered. The tolerance zone, in the considered plane, is limited by two parallel straight lines at a distance t from each other, only in the specified direction, at any distance a.
What is straightness error?
Straightness Error – A lateral translation error (for a point from a line) as a carriage is moved along it’s axis. The error along the nominal line of motion is referred to as linear displacement error. See also straightness, geometric errors, machine tool metrology, degree-of-freedom.
Which of the following is true for testing flatness with optical flats?
Which of the following is true for testing flatness with optical flats? Explanation: Due to very great angle between work and flats, bands will be close together and are nearly invisible. Number of bands appear is not an indication of the surface flatness but relates only to the wedge steepness. 11.
How do you call flatness on a drawing?
Flatness on Drawings Use of Flatness in a drawing is straightforward. Simply callout the Flatness allowance in a feature control frame with an arrow leader designating the surface being controlled. The Flatness feature control frame may also rest on an extension line for a dimension of the surface.