Unfortunately the ”purpose” for the need to define certain and specific terms and concepts", which would be helpful in determining the “intent” of the standard’s definition regarding inclusion and /or exclusion for features considered in respect to those definitions and concepts. More...
The company standard requires a minimum surface length (along axis) of 2.5MM (.098") in order to apply a Runout control. No one here seems to know why?
1) Does this have anything to do with inspection capability, for instance minimum diameters for dial indicator tips that are available ?
2)...
Yea's and nay's ?
A diametrical contour is rotated about an axis and is defined with basic dimensions and a geometric Profile control.
Is applying a Circular Runout control to one or more of the contour's cylindrical surfaces which are defined with basic dimensions
(vs. "limits of size"), in...
The part is a complex surface DLD (Direct Laser Disposition" with machining similar to material removal from a casting.
I have heard of "best-fit" in the past for castings. Recently I had access to ASME Y14.8 standard for castings .
Word search did not find this term defined in the standard as...
Looking for input as to which of the two notes below show the most promise for Basic Dimension measurements in Model Based Definition files
1 ALL UNSPECIFIED DIMENSIONS SHALL BE QUERIED FROM THE MODEL AND CONSIDERED BASIC.
QUERIED DIMENSIONS MUST BE TAKEN BETWEEN THE MEASURED SURFACE...
The "GDT Question" thread was a bit long for me to advance with some side bar questions, so I started this thread because there are some concepts and premises presented in that thread that I do not understand where they originate from: Self-Referencing datums and tolerance halving.
Axym, Your...
Does anyone know of supporting documentation in: ASME Y14.5 or other professional training material for the orientation of this type tolerance zone other than "parallel to line element direction" in the view of the FCF as defined in ASME Y14.5 ?
Referencing a previous thread where the answer to...
This forum is a curiosity to me. Over the years it seems as if there are a number of comments that indicate the use of GD&T is only for certain situations . Besides the forum I have encountered many who believe that if the design involves; a “simple part, or a “one off”, or precision tolerances...
ASME Y14.5 vs. ISO
I was recently informed that the philosophy of applying dimension according to ASME Y14.4m is completely opposite from the ISO version.
In ASME dimensions are applied to component features to define function and mating requirements, with “noted” process and mfg information...
Its been a month or so that I have been able to look at forum threads. I notice that the "start thread" and "reply" are different in format.
I am at a new facility however it appears Eng Tips has a new look. I noticed in a thread that Jieve was having trouble uploading a pdf.
I too am having...
Often we have parts that are partial diameters that fit over cylindrical surfaces.
I believe that the DRF defined by a partial cylindrical surface with target lines
is a way to define a primary datum plane related to a radius. With a hole as
the secondary datum I believe that a DRF exists which...
Input please....
(See attached drawing)
A drawing uses a position tolerance control for centering a flat by using 2 edges identified as a Feature of Size.
Do straight line edges constitute “opposing elements” as mentioned in the 1994 version’s definition of feature of size?
Would anyone like to comment on the following?
Would the following be accurate in understanding the potential surface effects for a cylindrical feature as a result of only a circular runout control?
1. A circular runout tolerance does not need to be less than the dimensional size limits...
For tolerance stack purposes , is it accurate to say;
“One half of the runout tolerance is the maximum that the cylindrical feature’s axis can be displaced from the cylindrical datum axis that the runout control references”?
True for Total runout?
True for Circular runout?
Single or Compound Datum?
1) If I have a block with 2 flanges (mounting features) on either side of a cutout. And those flanges had mounting holes in them, I would/could use the single planar datum from two surface features and call them e.g. A-B to establish a datum plane.
2) If I have a...
NX6
I recently tried to instance a series hole using a circular array.
The hole doesnt even show up in the feature list. (NX6)I "grouped"
the hole and it shows up in the feature list, preforms the array; at least it shows up in Part Navigator, however the holes do not show up in the solids...
The attached jpg has 3 questions regarding a clocking feature.
In another thread Pmarc was trying to convince me that the DRF origin was the center axis of that secondary feature. I argued it was not based on the Rule that a DRF is 3 mutually perpendicular planes, and that the tertiary datum...
(Pls see attached drawing)
Balloon 1:
Datum B is the pattern of 4 bosses
(delineated in this way for illustration only)
Balloon 2:
Dimensions originate from Datum pattern axis
Balloon 3:
Dimensions originate from “features” of pattern Datum B
Balloon 4:
Dimension is interpreted as equal...
