Morgama
Aerospace
- Feb 19, 2018
- 4
Hello Everyone,
I have at least two questions about a drawing that is coming my way soon, possibly more depending on what comes from this. A little background on myself, I've been working as an inspector for about two years now and I think that I have a basic understanding of GD&T, but I'm always learning and trying to understanding things more. A drawing very similar to this came across my desk a few days ago with a question on the GD&T as applied.
I have a couple of questions about what I thought that I knew, one being about the all-around modifier to the profile FCF. Would the modifier, in this case, work to include the cylinders that are protruding from the side of the part. I thought that the profile applied to everything in that view of the drawing, especially with the all around modifier, but am not sure because they are separate features. I look to Y14.5-2009 and see that a profile is an outline made up of one or more features.
8.2 PROFILE
A profile is an outline of a surface, a shape made up
of one or more features, or a two-dimensional element
of one or more features. Profile tolerances are used to
define a tolerance zone to control form or combinations
of size, form, orientation, and location of a feature(s)
relative to a true profile.
I have a colleague who says that the profile would only apply to the block and not to the cylinders.
The second question that I have is regarding the position FCF on the cylinders. It seems to me that they are missing a full 6 DOF constraint, because there is nothing to stop the rotation around the Datum B axis. Is this a compliant callout per Y14.5-2009?
I do have to say that I'm glad to be here, I've lurked for quite awhile and have read many awesome posts relating to questions that I have had in the past. Thanks to anyone wishing to chime in.
~Matt
I have at least two questions about a drawing that is coming my way soon, possibly more depending on what comes from this. A little background on myself, I've been working as an inspector for about two years now and I think that I have a basic understanding of GD&T, but I'm always learning and trying to understanding things more. A drawing very similar to this came across my desk a few days ago with a question on the GD&T as applied.
I have a couple of questions about what I thought that I knew, one being about the all-around modifier to the profile FCF. Would the modifier, in this case, work to include the cylinders that are protruding from the side of the part. I thought that the profile applied to everything in that view of the drawing, especially with the all around modifier, but am not sure because they are separate features. I look to Y14.5-2009 and see that a profile is an outline made up of one or more features.
8.2 PROFILE
A profile is an outline of a surface, a shape made up
of one or more features, or a two-dimensional element
of one or more features. Profile tolerances are used to
define a tolerance zone to control form or combinations
of size, form, orientation, and location of a feature(s)
relative to a true profile.
I have a colleague who says that the profile would only apply to the block and not to the cylinders.
The second question that I have is regarding the position FCF on the cylinders. It seems to me that they are missing a full 6 DOF constraint, because there is nothing to stop the rotation around the Datum B axis. Is this a compliant callout per Y14.5-2009?
I do have to say that I'm glad to be here, I've lurked for quite awhile and have read many awesome posts relating to questions that I have had in the past. Thanks to anyone wishing to chime in.
~Matt
