I do not have a drawing, this is an initial concept without a print. They would be three individual bearings that would be in a single assembly and not attached to the same part in that assembly. They are not coaxial, but two of the three would be coplanar (if the bearings did swivel).
Is there any reason two coaxial holes with a composite positional tolerance can't be used as a Datum? To be clear, the holes are located to a DRF with one tolerance and tighter to each other with another in the composite FCF. With these two coaxial holes established, a second DFR will be...
Indeed to all you said. I have both those books. I have done many tolerance stack ups to identify and correct problems created by poor drawing definition. I have made all the pitches and cited many specific examples, but the bottom line is we are too busy to implement training. I now review...
This is really god conversation. The problem is our company as a whole lacks adequate GD&T knowledge. We have adapted 1994, used it poorly and paid the price. 7 of 10 know nothing of any standard. Less than 1 in 10 understand how to use it correctly. If the company were to have...
Please advise.
The attachment shows three callouts of a surface profile.
The top picture is simple enough. A bi-lateral tolerance with the limited length is called out with a center line (one small lines between longer lines, reference Figure 1.1 of 1994).
The middle picture depicts a...
When using datum targets on a flexible part with a complex shape, there is no limit to the number of primary target points. Can the secondary have more than two target points?
I have an Assembly that has both a ridged, relatively small part and a larger, flexible part each bolted and riveted together thru a series of other parts. In regards to selection of a datum scheme, the primary datum could be a feature on either of the parts as they both equally represent...
drawoh,
Thanks for your help. The part width is well controlled. Background to clarify: I am using 3 target points on the OML for primary. I have another part to center in the opening and the important thing is to have equal gaps on all four sides between the parts. This is not a tough...
I have part with complex surface with 4 target points for primary and 4 edges, no two opposing edges.
I want to use two target points on each of two opposite, but non-opposing edges to create a compound secondary datum to use as a center plane. Is this acceptable?
Checker Hater. I was mistaken in that statement and stand corrected. It is still two segment in 2009. I am not as familiar with 2009 as I use 1994. I am learning 2009 and appreciate that correction. )I thought I had seen it in one of my reference text books). If you please, and just so I am...
Unless I am missing it, multi single segment profiles are not mentioned in 1994. Supplemental books of 1994 standard do discuss it, but they are but clear to me. I need to understand refinement of upper segment edge profiles. I think for both composite and multi single segment profiles it is...
I have seen some drawings for parts that have surface profile call outs of a lofted surface. The FCFs have profiles with no Datum references in the FCFs. It has been suggested that the datum references in the FCF of the profile are not required since, for surface profile of .020, the surface...
