Below is my study on DRF establishment (for CMM inspection) of different datum options when we want to make a hole a datum feature which has an angle with primary datum plane.
Like to here thoughts from the experts if my understanding is correct.
Overall shape of my part looks like this...
Years ago, when my customer adopted MBD, its MBD construction guideline said that each MBD shall have a coordinate system and a datum reference frame as I recall, which sometimes made those useless for simple parts which do not need datum.
ASME Y14.41 Digital Product Definition Data Practice...
Symmetry is removed from Y14.5-2018. So let's talk about 1994 or 2009 version.
What I understood about the symmetry so far is:
1. symmetry controls median points of tolerance feature
2. datum feature can be either a cylindrical feature of size or a feature of size that is composed of opposed...
Below figure is captured from Y14.5-2018.
Figure (d) was not there in 1994 and 2009, but appeared in 2018.
Say I have an actual part exactly looks like figure (d). The surface is perfectly straight, but tapered as in the figure.
This figure implies that straightness of the part surface is 0.02...
Hi all,
I need your advise.
Please have a look at Y14.5 - 2009 Fig. 4-46. I will not talk about the customized DRF so let’s modify some features.
- Datum feature B is not a square cutout, it is a round hole with perpendicularity control w.r.t. Datum A
- Datum feature C is same as original...
In Y14.5-2009 Figure 7-39(a), DRF A|B in the lower segment constrains the orientation of FRTZF to datum A and B. And reference to datum C is not required since it does not give any additional meaning to the DRF.
But look at the picture below. I modified Figure 4-9(a), changed datum C to the...
Hi, gentlemen
This is my first posting.
I'm a design engineer of commercial aircraft structures for Korean aerospace company.
I took ASME GDTP Senior level exam last month and got a letter from ASME a few days ago which says I passed the assessment.
I probably have some knowledge in theory, but...
