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NASA ENGINEERING DRAWING STANDARDS MANUAL said:4.7. Installation Assembly Drawing
An installation assembly drawing shows where and how parts and/or assemblies
are installed relative to supporting structure or associated items. It shows
locating dimensions, tolerancing, specifies attaching parts (such as rivets, bolts,
or screws) and specific adjustments, assembly instructions, and processes
required for completing and inspecting the installation.
a. That portion of the structure into which the installation is being installed shall
be shown in phantom and identified by its part number. Such identifications
shall be indicated as reference information by enclosure of the part number in
parentheses or by use of the symbol “REF.”
b. Applicable datum points or planes, such as center lines of structure, plane of
symmetry, station planes, etc., shall be shown and identified.
c. Parts may be detailed in place on installation drawings when convenient.
Dumbutz said:“…how can the gage equipment be physically located in the actual assembly?”
Dumbutz said:“Wouldn't the features that are chosen for a DRF be based on part functionality and mating interfaces?”
Dumbutz said:Wouldn't those DRF features be inaccessible to gage equipment once the parts are assembled?”
dtmbiz said:...
drawOh just posted and doesn’t see a problem with dimensions on an "assembly" drawing.
Well then the concept of simulating a datum thru the use of gage equipment is out the door.
If the mating production part surfaces which all have been produced at varying tolerances,
and varying form; and those surfaces are used to establish datums... IMO you might as
well just forget about primary Y14.5 concepts. IMO