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Anonymous users2024-02-11The architectural drawings stipulate that except for the building elevation in m, all other dimensions are in mm.
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Anonymous users2024-02-10Basic rules for drawing dimensioning.
1. The real size of the parts should be based on the size value noted on the drawing, and has nothing to do with the size of the drawing and the accuracy of the drawing.
2. The dimensions in the drawings (including technical requirements and other instructions) are generally in millimeters. When the unit is millimeters, the code or name of the unit of measurement is not noted, and if other units are used, the code or name of the corresponding unit of measurement must be indicated.
3. The size marked in the drawing is the final finished size of the machine represented in the drawing, otherwise it should be explained separately.
4. Each size of the machine is generally only marked once, and should be marked on the graphic that reflects the structure most clearly. In order to facilitate the drawing, use and storage of drawings, drawings should be drawn in the specified format and grid dimensions are usually composed of the following basic elements.
5 Size Text: Indicates the actual measured value. The measured values are automatically calculated and appended with tolerances, prefixes, suffixes, etc. The user can customize the text or text.
6. Dimension line: indicates the range of annotation. The start and stop characters at each end of the dimension line indicate the start and end points of the dimension. The dimension line is parallel to the noted line segment, and the ends point to the witness line.
7 start and stop characters: indicate the start and end positions of the measurement. A variety of symbols are available, and users can create custom start and stop characters.
8Witness Line: Extends from the dimensioned object to the dimension line. The start point is offset by one distance from the point of interest.
The three elements of dimensioning.
Witness Lines—Used to limit the range of dimensions to be inscribed. Draw with a thin solid line. Generally, the contour line, axis line, and symmetry line are drawn out as the dimension boundary, and the above line type can also be directly used as the dimension boundary. 2-3mm beyond the end of the size line.
Dimension line (with arrows) – drawn with a thin solid line. It should be parallel to the line segment you are betting on.
Size figures. The diameter of the dimensioned symbol is represented by "", and the ball is represented by "s" and "sr". The radius is denoted by "r", the square structure is denoted by " ", and the reference size is numbered with "(
1. When marking linear dimensions: the horizontal direction of the number prefix is facing upward; Vertically, the numeric prefix faces left. 2. When marking the angle size:
Numbers are always written horizontally, and are noted at the break, outside or out of the dimension line, which is an arc line. In fact, this is not the case at all, the numbers do not have to be written horizontally. 3. When marking circles and arcs:
The circle is preceded by the number "" arc is preceded by the number "r" sphere is preceded by the number "s" or "sr" when the circle and arc are labeled, the dimension line should pass through the center of the circle. Dimension numbers cannot be crossed by any drawing lines; The large size is on the outside, and the small size is on the inside.
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Anonymous users2024-02-09There are three elements of dimensioning: dimension lines, dimension lines, and dimension numbers.
1. Size number.
The number of linear dimensions should usually be written above the dimension line. It is also possible to write on the polyline of the dimension line.
2. Dimension line.
Dimension lines are drawn as thin solid lines that indicate the direction of the marked dimensions.
3. Dimension boundary.
1) Dimension boundaries are drawn with thin solid lines, and must be drawn from the contour lines, axes, and centers of symmetry in the drawing. Contour lines, axes, and symmetry centerlines can also be used as dimension boundaries.
2) The size border should usually be perpendicular to the size line and slightly above the size line (usually 3-4 mm is appropriate). In special cases, it may not be perpendicular, but the two boundaries should be parallel to each other.
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Anonymous users2024-02-081. When marking the diameter, the symbol "r" should be added before the size number "When the radius is marked, the symbol "r" should be added before the ruler and the inch number; When marking the diameter or radius of a sphere, it should be marked with a slippery mark".
or "r" before the symbol "s".
For the head of screws and rivets, the ends of shafts (including screws), and the ends of handles, the symbol "s" may be omitted so as not to cause misunderstanding.
2. When marking the arc length, the symbol should be added above the size number".
3. When marking the reference size, the size number should be added with parentheses.
4. When marking the size of the cross-section as a square structure, the symbol can be added before the number of the length of the square side
or with b b".
5. When marking the thickness of the plate-shaped parts, the symbol "t" can be added before the size number
6. When it is necessary to indicate that the radius size is determined by other dimensions, the dimension line and the symbol "r" should be marked, but do not indicate the size number.
7. When marking the slope or taper, the line width of the symbol is h
10。The direction of the symbol should be consistent with the direction of the slope and taper.
If necessary, the taper can be marked at the same time, and the angle value of the wheel can be assigned in parentheses.
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Anonymous users2024-02-07There are usually three forms of dimensioning:
1.Direct annotation method: The dimension value is directly annotated on the drawing, which is often used for simple drawings and drawings with fewer dimensions.
2.Datum annotation method: take a certain datum or datum axis as the reference, and use symbols and numerical values to represent the distance or difference between other dimensions and the base height.
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