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DIMENSIONING:
BASIC RULES
• Use enough dimensions to show the size of all
object features.
• Do not repeat dimensions if you already have them
or they can be worked out from others you have on
the drawing.
• Place dimensions in the clearest possible way.
• All dimensions will be written using the same unit.
Stand-alone numerical values mean millimeters.
• Dimensions should be read from the bottom
(horizontal lines) or right hand side (vertical lines)
• Dimension values must be placed above and parallel
to dimension line.
Dimensioning: General rules
2 mm.
7 mm.
59
Dimension line Arrows ValueExtension lines
Dimensioning: Items
Dimension line must be
kept apart at least 7 mm
from the drawing.
Extension lines must
exceed dimension line
about 2 mm.
Dimensioning: Edges
Dimension lines can not match any edge...
...nor prolong any edge...
...nor match any axis
Dimension lines do not cross each other, nor cross
any other line or item of the drawing.
Dimensioning: Edges
Dimension lines must be placed at the same level
Chain Dimensioning
Parallel Dimensioning
Dimension lines do not cross each other, nor cross any other
line or item of the drawing…
Thus, using parallel dimensioning: The smaller is a dimension
value, the closer we place it in the drawing
45 156 5035
If line is too small, place
arrows outside the extension
lines
If room is too small, place value
outside, on the right
If arrows can not be placed outside,
place a point instead......and write value using an auxiliary
line, same oriented.
Dimensioning: Small edges
35
Dimensioning: Diameters
30
30
•Dimension lines must not match
any symmetry axis.
•Use diameter values for arches
higher than 180º
•Two dimension lines sharing
same center must be placed
using different slopes.
Dimensioning: Diameters
45
65
25O
•In case you have concentric
circumferences, do not place more
than 2 dimension lines in the same
part of the drawing.
•Add the diameter symbol “Ø”
before the numeric value to clarify
an unclear diameter.
•Dimension line must not match any
symmetry axis.
•Use diameter values for arches
higher than 180º
•Two dimension lines sharing same
center must be placed using
different slopes.
Dimensioning: Radius
•Use radius values for arches
equal to or lower than 180º.
20
60
•If room is too small, place
arrow and value outside
R90
•If center is located beyond
the scope of the drawing,
add the radius symbol “R”
before the numeric value…
… and this unfinished
dimension line must follow
the same radius direction.

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Dimensioning / Acotación

  • 2. • Use enough dimensions to show the size of all object features. • Do not repeat dimensions if you already have them or they can be worked out from others you have on the drawing. • Place dimensions in the clearest possible way. • All dimensions will be written using the same unit. Stand-alone numerical values mean millimeters. • Dimensions should be read from the bottom (horizontal lines) or right hand side (vertical lines) • Dimension values must be placed above and parallel to dimension line. Dimensioning: General rules
  • 3. 2 mm. 7 mm. 59 Dimension line Arrows ValueExtension lines Dimensioning: Items Dimension line must be kept apart at least 7 mm from the drawing. Extension lines must exceed dimension line about 2 mm.
  • 4. Dimensioning: Edges Dimension lines can not match any edge... ...nor prolong any edge... ...nor match any axis
  • 5. Dimension lines do not cross each other, nor cross any other line or item of the drawing. Dimensioning: Edges
  • 6. Dimension lines must be placed at the same level Chain Dimensioning
  • 7. Parallel Dimensioning Dimension lines do not cross each other, nor cross any other line or item of the drawing… Thus, using parallel dimensioning: The smaller is a dimension value, the closer we place it in the drawing
  • 8. 45 156 5035 If line is too small, place arrows outside the extension lines If room is too small, place value outside, on the right If arrows can not be placed outside, place a point instead......and write value using an auxiliary line, same oriented. Dimensioning: Small edges
  • 9. 35 Dimensioning: Diameters 30 30 •Dimension lines must not match any symmetry axis. •Use diameter values for arches higher than 180º •Two dimension lines sharing same center must be placed using different slopes.
  • 10. Dimensioning: Diameters 45 65 25O •In case you have concentric circumferences, do not place more than 2 dimension lines in the same part of the drawing. •Add the diameter symbol “Ø” before the numeric value to clarify an unclear diameter. •Dimension line must not match any symmetry axis. •Use diameter values for arches higher than 180º •Two dimension lines sharing same center must be placed using different slopes.
  • 11. Dimensioning: Radius •Use radius values for arches equal to or lower than 180º. 20 60 •If room is too small, place arrow and value outside R90 •If center is located beyond the scope of the drawing, add the radius symbol “R” before the numeric value… … and this unfinished dimension line must follow the same radius direction.

Editor's Notes

  1. Las líneas de acotación no deben coincidir con aristas y ejes ni ser continuación de aristas
  2. Las líneas de acotación no se cruzan entre si ni con ninguna otra línea.
  3. Las líneas de acotación en serie se colocan alineadas.
  4. Las líneas de acotación no se cruzan entre si ni con ninguna otra línea. Para evitarlo en la acotación en paralelo colocaremos las cotas mayores más alejadas y las menores más cerca de la figura.
  5. Si la cifra de cota tiene poco espacio se colocará fuera, a la derecha Si las flechas quedan muy juntas se sacan fuera de las líneas auxiliares Si las flechas no se pueden sacar afuera se sustituyen por un punto... ...y las cifras se sacarán con una línea de referencia man- teniendo su dirección.
  6. Los arcos mayores de 180º se acotarán con su diámetro. La línea de cota no puede coincidir con los ejes de simetría. Las líneas de cota se colocarán en diferentes ángulos.
  7. Los arcos mayores de 180º se acotarán con su diámetro. La línea de cota no puede coincidir con los ejes de simetría. Las líneas de cota se colocarán en diferentes ángulos. No se acotarán más de dos circunferencias concéntricas. El resto se acotarán en otra vista. Se añadirá el símbolo del diámetro cuando no sea evidente que estamos acotando una circunferencia.
  8. Los arcos menores o iguales a 180º se acotarán con su radio. La flecha y la cifra de cota irán por fuera si hubiera poco espacio. Si no conocemos el centro del arco colocaremos delante de la cifra de cota el símbolo de radio “R”.