jeanpaul
Industrial
- Apr 25, 2002
- 26
Placement of the new datum feature symbol (triangle) can be critical.
If the triangle is in front of the arrow dimensionning a feature it indicate that a datum axis should be established using the feature indicated.
If the triangle is on a "leg" of a dimension, the datum may be interpreted as a line lying in a plane tangent to the feature indicated.
It is not the same meaning at all.
My question: How do you put a datum reference in front of the arrow (first case) ? - It should be linked to the position of the dimension.
I use a tip with a geometric dimensioning box whithout any symbol and draging it outside the dimension but in doing so, I got an arrow at the foot of my datum reference symbol and not a triangle as it should be according to the last standard (1994). Note: For this one it is the same in ASME and ISO.
If the triangle is in front of the arrow dimensionning a feature it indicate that a datum axis should be established using the feature indicated.
If the triangle is on a "leg" of a dimension, the datum may be interpreted as a line lying in a plane tangent to the feature indicated.
It is not the same meaning at all.
My question: How do you put a datum reference in front of the arrow (first case) ? - It should be linked to the position of the dimension.
I use a tip with a geometric dimensioning box whithout any symbol and draging it outside the dimension but in doing so, I got an arrow at the foot of my datum reference symbol and not a triangle as it should be according to the last standard (1994). Note: For this one it is the same in ASME and ISO.