Search results
Results from the WOW.Com Content Network
I disagree that the definition of t.p at 1.3.36 takes precedence over the statement in 5.2.1.3; 1.3.36 is only a "basic" definition, while 5.2.1.3 expands on the definition and it's application. In the example fig. 5.2, I don't see where the bolt circle is controlled; rather the holes are controlled with ordinate dimensions, and the bolt circle ...
I do prefer putting "REF, SH1,Z3G" next to a repeated basic dimension rather than turning the basic dimension into parenthetical dimension alone. Thanks, btrueblood for that thought. We too use Pro/E Wildfire, and expect it to automatically change any repeated basic dimensions (as long as they are associative), but the point is well taken that ...
Because a basic dimension can locate a tolerance zone, then the tolerance zone limits the imperfection of a feature's location and/or orientation. Like someone said here:"While Y14.5's wording doesn't support this nearly as well as I think it should, all explanations of orientation or location tolerances benefit if basic dimensions are thought ...
Where a basic dimension is repeated on a drawing, it need not be identified as reference. For information on how to indicate a reference dimension, see para 1.7.6. 1.4 FUNDAMENTAL RULES (c) Each necessary dimension of an end product shall be shown. No more dimensions than those necessary for complete definition shall be given. The use of reference
I would read that 10 basic dimension (32-22) is the length of the full formed thread. But it is just me. To complete a little bit more this figure maybe a note such as "CAD is nominal" or "refer to the CAD model for incomplete definition, basic CAD per model#####" or an equivalent note.
A basic dimension is a theoretically exact value, where as, in a sense, it could be argued that a non-basic dimension without a tolerance is theoretical exact value. The traditional "size" dimesion would have a tolerance attached to it or default to a general tolerance, while the basic dim has its tolerance in a FCF.
2.1.1.2 Basic Dimensions. Basic dimensions may be indicated on the drawing in the following ways: (a) applying the basic dimension symbol to each of the basic dimensions. See Fig. 7-1, illustrations (a) and (b). (b) specifying on the drawing (or in a document referenced on the drawing) a general note such as: UNTOLERANCED DIMENSIONS ARE BASIC. See
look in the standard. paragraph 1.3.9, the definition of 'dimension, basic' tells us that a basic dimension is toleranced by either tolerances on other dimensions, a feature control frame, or in a note. a stand-alone linear dimension cannot be basic.
One thing to note from the very beginning: DEFAULT TOLERANCE NEVER APPLIES TO BASIC DIMENSION! (I cannot over-emphasize that ) Then point-by point: Diameter 3.798 should measure 3.796 to 3.800 Creator of the drawing probably wants diameter 5.004 measure 5.000 to 5.008 but it isn't clear on the drawing Height .630 should measure .626 to .634
There are more cases of Basic Dimension use per ASME Y14.5-2009 that can be discussed. For instance, Basic Dimensions used to locate DATUM targets. Best Practice is to include those in the FAI to show the FAI approver that they were achieved by using whatever device to achieve those Basic dimensions( like Gage Blocks).