Koether
Mechanical
- Jun 20, 2007
- 10
Looking some of our old drawings I keep seeing surfaces with a parellel requirement along with a flatnessness requirement of the same magnitude.
I was under the impression that parallelism already requires flatness to within the parallelism requirement, majking an additional flatness requirement (equal or greater to the parallelism) completely meaningless.
I did search for this but I didn't find anything (that I agreed with) that adresses this exact question.
from y14.5 Sec 6.3.3:
"Parallelism is the condition of a surface or feature’s
center plane, equidistant at all points from a datum plane;
or a feature’s axis, equidistant along its length from one
or more datum planes or datum axis."
A datum plane is perectly flat so I don't see how this doesn't require flatness.
I was under the impression that parallelism already requires flatness to within the parallelism requirement, majking an additional flatness requirement (equal or greater to the parallelism) completely meaningless.
I did search for this but I didn't find anything (that I agreed with) that adresses this exact question.
from y14.5 Sec 6.3.3:
"Parallelism is the condition of a surface or feature’s
center plane, equidistant at all points from a datum plane;
or a feature’s axis, equidistant along its length from one
or more datum planes or datum axis."
A datum plane is perectly flat so I don't see how this doesn't require flatness.
