Phantom Datum on a Product Design Drawing
Phantom Datum on a Product Design Drawing
(OP)
Hi,
We are using ASME Y14.5-2009. This is a MIM part (mold). Our Design department's final checker is a Manufacturing Enginneer. He has REDLINED a part that I don't fully agree with, but I could be wrong. Please HELP.
The base of this part is critical to fit. Two opposite sides are angled with a long "bump" on each side for an interference fit. The "final checker" has chosen to add another phantom dia gage pin on each side, just up from the bumps, to create the angle. So, each phantom pin (.100 dia.) is about 2 inches apart measured at each center. He has a dimension from inside tangent to inside tangent of 1.900 ±.0015 and that dim. is Datum G. The inside tangent is inside the molded part which is filled with material. In true position FCFs on other areas of the part, he does reference DATUM G.
Is this possible or even legal to do? DATUM G is not a feature on the part and is also inside material. Not making sense to me.
PLEASE HELP. Thank you.
We are using ASME Y14.5-2009. This is a MIM part (mold). Our Design department's final checker is a Manufacturing Enginneer. He has REDLINED a part that I don't fully agree with, but I could be wrong. Please HELP.
The base of this part is critical to fit. Two opposite sides are angled with a long "bump" on each side for an interference fit. The "final checker" has chosen to add another phantom dia gage pin on each side, just up from the bumps, to create the angle. So, each phantom pin (.100 dia.) is about 2 inches apart measured at each center. He has a dimension from inside tangent to inside tangent of 1.900 ±.0015 and that dim. is Datum G. The inside tangent is inside the molded part which is filled with material. In true position FCFs on other areas of the part, he does reference DATUM G.
Is this possible or even legal to do? DATUM G is not a feature on the part and is also inside material. Not making sense to me.
PLEASE HELP. Thank you.





RE: Phantom Datum on a Product Design Drawing
Can you post a picture that represents what you have and also what you want?
RE: Phantom Datum on a Product Design Drawing
RE: Phantom Datum on a Product Design Drawing
I hesitate to send an attachment because of propriety reasons because I'm a contractor.
RE: Phantom Datum on a Product Design Drawing
RE: Phantom Datum on a Product Design Drawing
I've learned it's OK to care, but it's not worth it to worry.
RE: Phantom Datum on a Product Design Drawing
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Phantom Datum on a Product Design Drawing
RE: Phantom Datum on a Product Design Drawing
If I can make the time and the comfort level, I'll send in a picture.
RE: Phantom Datum on a Product Design Drawing
RE: Phantom Datum on a Product Design Drawing
“Know the rules well, so you can break them effectively.”
-Dalai Lama XIV
RE: Phantom Datum on a Product Design Drawing
Thanks everyone.
RE: Phantom Datum on a Product Design Drawing
RE: Phantom Datum on a Product Design Drawing