Let me start over.
How can I tolerance the orientation of the edge to the dowel hole and datum c without having to use a note like this?
Hope this helps
I removed all dimensions from the drawing that I thought were not essential to my question.
The indicating edge needs to be controlled because the machine operator uses a dial indicator to square up the fixture on the cnc machine.
The critical part of this fixture is the center locating ring and...
yes, diameter symbol is missing. Thanks
Ignor the cad interface axis. It is part of the cad system, not part of the drawing.
Any suggestions on my actual question?
Is this the correct way to GD&T this?
The dowel hole must have a tight positional tolerance to the center locating ring, and that it is in this orientation to the indicating edge (-B-) of the fixture. The indicating edge has to be orientated tightly horizontally to the pattern, but can have a...
IGNORE LAST POST!!!
with the fixture bolted (4x) to a machine bed, datum -B- is indicated square (to the machine).
(So the 4x bolt pattern is not relevant to my intent at this point.)
when -B- is indicated square on a machine, the dowel hole needs to be in proper orientation (position) to...
with the fixture bolted (4x) to a machine bed, datum -c- is indicated square (to the machine).
(So the 4x bolt pattern is not relevant to my intent at this point.)
when -c- is indicated square on a machine, the dowel hole needs to be in proper orientation (position) to datum -b-.
Perp of -c-...
I am not sure how to do this.
This is a fixture to hold a part for machining.
A locating spud in the center and a dowel will locate and orientate the part being held.
My intent is to have the .250 dia dowel hole kept relative to datum -b- very close.
The distance of datum -c- to the pattern is...
Question:
If you remove all the datums and make the FCF profile of .003 (no datums), is that adequate if all one is concerned with is that the shape is good to itself along the noted length within profile of .003?
Well, i did not mean to ignor your question. The locate notes are for processing and machining. The ends get sawed off and faced after the profile is machined.
The profile IS NOT related to any cylindrical features. It has to be good to itself.
Inspection dept asked for datums in order to...
ignore the LOCATE notes.
They are for the machining center to hold the part.
They are a process note, not a inspection note.
Sorry, I should have removed them for this question or clarifoed that.
My intent is that the profile is good to itself along the designated length. I have added datums to help the inspectors, however, I'm thinking that I can achieve my intent with a profile FCF with no datums at all.
Comments?
I have a hamilton sundstand drawing with several diameters along an axis. The diameters only have feature of size tolerance.
No concentricity is listed for the multiple diameters. How is concentricity infered or controlled on such a drawing? What is the Y14.5 spec that can be used to answwr this...
Years ago I took my GD&T classes from Lowell Foster (He is one of the authors of ASME Y14.5 1994). Only recently I returned to the field, so I am rusty on my GD&T. But I definitly remember Lowell telling us that the concepts of GD&T, if understood, had much more potential as well as symbolic...
Gee, I dunno.
I guess the no datum kinda made sense to me when I thought about it.
If there is a position callout of a feature and no datum, than the relationship is to the feature itself, not something else (like a datum).
And, of course, this can only be multilple features of the same geometry...
I think I understand option#1.
The first two segments are decribed in 5-26 of 1994.
The third is in 5-51, although that is a composite example the intention can be reproduced with single segment frames due to the lack of a datum.
Right or wrong?
Hey,
great stuff. Really.
I would have never attemped option 3 because I never thought of combining a single segment feature control frame with a separate composite control frame for the same feature.
I could not find an example after browsing through my ASME or Lowell Foster books. Anything in...
I am using 1994.
Yes, I mean the holes are parallel to -A-, not perp (my bad).
Yes, the shaft should be -A-. (my bad again).
I am looking at pauljacksons solution. His suggestion may answer my problem. I thought it was possible to meet all my conditions with a composite frame. I may be asking...
I have tried several types of composite boxes, but none seem to describe what I want, or at least they dont look right to me.
My intent is to have the .375 dia have a position tolerance of .014 from datum -a- but .003 from centerline of datum -b-.
I also want an orientation tolerance of .003 for...
