As a former driver of the machine, you have countless images and countless treatments. When we talk about “formal tolerance”, it is theoretical and practical professional knowledge. In production, if we understand the tolerance of the drawing of the drawing, it will deviate from the treatment analysis, the treatment of results and requirements, and even will bring serious consequences. Today, let’s systematically understand 14 tolerances.
First show the key points.
01 Straight
The right degree, which is generally called the right degree, means that the actual shape of the straight line on the parts maintains the ideal straight line. The tolerance of the straight lines is the maximum volume authorized by the actual line to the ideal straight line.
Example 1: In a given plan, the tolerance area must be in the area where the two lines of lines with a distance of 0.1 mm must be 0.1 mm.
02 degree by plane
The degree of plan, which is generally called flatness, means the real shape of the parts plan elements and maintains the state of the ideal plane. The flat degree tolerance is the maximum variable authorized by the real surface for the ideal plane.
Example: the tolerance area is an area between two parallel planes between 0.08 mm.
03 Roundté
The circularity, which is generally called exhaustiveness, means that the real shape of the elements on the parts of the part maintains the distance between the center. The tolerance to the roundness is the maximum volume authorized by the real circle towards the ideal circle on the same surface.
Example: the tolerance area must be on the same positive cross section, and the radius difference is the area between the two concentric circles with a tolerance value of 0.03 mm.
04 cylindricality
The cylindrical means that the surface of the column is on the outline of the surface of the column, which maintains the equivalent of its axis. Cylindrical tolerance is the maximum volume authorized by the real cylinder to cope with the ideal cylindrical surface.
Example: the tolerance area is the area between the two coaxial cylinders with a radius tolerance of 0.1 mm.
05 Overview of the line
The contour of the wire is the curve of any form given of the room to maintain the condition of its ideal shape. The line around tolerance refers to the eligible variable of the real outline line of the unlimited curve.
06 Face Overview
The surface area is the surface of all shape of the room to maintain the condition of its ideal shape. Tolerance to the facial outline refers to the real outline line of the unlimited surface, which allows the amount of modifications to the ideal outline surface.
Example: the tolerance area is between two packaging lines with a series of balls with a diameter of 0.02 mm.
07 parallel
The parallelism, which is generally said in parallel, indicates that the real factors on the parts on the parts maintain the equivalence in relation to the reference. Parallel tolerance is the real direction of the measured elements, and the maximum variable quantity authorized between the ideal direction of the parallel and the reference.
Example: If you add a brand before the tolerance value, the tolerance area is the cylindrical surface with a parallel reference diameter φ0.03 mm.
08 Verticality
Verticality, which generally maintains the degree of orthogonal, indicates that the elements measured on the parts are relating to the reference elements and maintain the correct angle of 90 °. Vertical tolerance is the actual direction of the measured factor and the maximum variable volume authorized between the ideal direction of the reference.
09 inclination
The inclined means that the two factors on the parts in the relative direction of the pieces arbitrarily maintain an arbitrary angle. The tolerance for inclination is the real direction of the measured elements and the maximum variable allowances authorized between the ideal direction of the reference to be given arbitrarily.
Example 1: The tolerance area of the measured axis is the area between the two parallel planes with a theoretical angle of 60 ° with a theoretical angle of 60 ° of the reference surface A.
10 position
Positioning is elements such as points, lines and faces on the parts, and the precise condition of its ideal position. The position tolerance is the maximum volume of the actual position of the test element compared to the ideal position.
Example: When the band is added with the brand S φ, the tolerance area is an internal area with a diameter of 0.3 mm. The position of the central point of the ball difference is the correct size of the theoretical of reference A, B and C.
11 Coaxial degree (concentric)
The same axis, which is generally called the degree of common axis, indicates that the axis measured on the parts is relating to the reference axis and is preserved on the same line. The tolerance of the coaxial axis is a variable volume authorized by the real axis compared to the reference axis.
12 symmetry
The degree of symmetry is the state that the symmetrical central element of the two in the room is kept in the same central plane. Symmetrical tolerance is the symmetrical central surface (or central line, axis) of the real element.
Example: the tolerance zone is a two parallel plan or a straight line or between the two parallel planes or between the central reference plane or the symmetrical configuration of the central line.
13 round jumps
Round threshing means that the rotary surface of the part is in a limited measurement surface, which maintains a fixed position compared to the reference axis. The round jump tolerance is the almost axis of the real element of the test.
Example 1: The tolerance zone is perpendicular to any measurement plan, with a radius difference of 0.1 mm and the region between the two concentric circles on the same reference axis.
14 full jump
The completely beaten refers to the volume of the surface surface when the parts run continuously, and the volume of the study on the surface is turned continuously. Complete jump tolerance is a continuous rotation of the real element of the real element measured.
Example 1: The tolerance area is the area between the two circles of the 0.1 mm radius and the two round columns with the reference coaxial.
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