What is geometric dimension, mathematical geometry to find the dimension

Geometric tolerances, abbreviated as GTOL, provide a comprehensive way to specify the important surfaces of a part and how they relate to each other, as well as how to inspect the part to decide whether or not to accept it.

They provide a way to control positional tolerances, geometric tolerances, profiles, tolerance directions, and feature deficiencies. Stored in a solid model"Pro Engineer geometric tolerances", contains parametric references to the controlled geometry or feature (its reference entities), as well as parametric references to reference datums and axes. As a result, the system updates the display of geometric tolerances when the reference datum is renamed.

In assembly mode, you can create a geometric tolerance in a subassembly or part. GTOLs created in part or assembly mode automatically belong to the part or assembly that occupies the window; However, it can reference only datums that have been set to belong to the model itself or to the components within it. It does not refer to a datum outside the model in some of the surrounding components, and not to the features created by the assembly.

GTOLs can be added in part or drawing mode, but they can be reflected in all other modes. They are considered annotations in the system, and they are often associated with the model. Although geometric tolerances are different from dimensional tolerances, they do not affect part geometry.

When you add a GTOL to a model, you can attach it to an edge, an existing dimension, or an existing GTOL, or you can display it as an annotation without a guide. However, before you can place geometric tolerances, you must set the datum and basic dimensions.

Dimensional tolerance, referred to as tolerance, refers to the difference between the maximum limit size and the minimum limit size, or the difference between the upper deviation and the lower deviation. It is the amount of permissible dimensional variation. A dimensional tolerance is an absolute value with no sign.

Geometric tolerances – Strictly speaking, shape tolerances and position tolerances, referred to as geometric tolerances.

Shape tolerance: The allowable variation between the actual shape of the points, lines, and polygon elements that make up the geometric features of the part and the ideal shape.

Position Tolerance: The amount of allowable variation of the actual position of the point, line, or polygon feature on the part relative to the ideal position.

Dimensional tolerance – refers to the amount of variation allowed in size.

The geometric tolerance content is represented by a box, and the first grid from left to right is always the geometric tolerance bullet, the second box is the tolerance value, and the third grid is the datum, even if the guide line is drawn from the right end of the frame.

The dimension tolerance is made up of dimension lines, witness lines, and numerical values. The values are placed on the dimension line.

It should be the length, width and height. The most basic geometry is a matter of size. What a strange question.

Let the radius of the minor circle be r, the radius of the great circle be r, the center of the circle be o, and the angle aod be x, then: r=r+, three-formula solution, x=, then r=, r=, and then use the triangle theorem to find bc=, ad=

In fact, it is to divide the L-shaped plane figure into the sum (or difference) of the area of two rectangles, and use any straight line at the intersection of the diagonal lines of the rectangle to divide the area of the rectangle to solve the problem