Single-Segment tolerance for single hole
Single-Segment tolerance for single hole
(OP)
This is a simple question that I'm embarrassed I can't find an answer for. Given a simple hole in a part where I'm interested in more tightly controlling deviation in the 'x' direction than the 'y' direction can I simply do a single segment position tolerance where the first segment one establishes overall deviation in the x-y plane and then a tighter tolerance while omitting the datum corresponding to y?
e.g. ( Datum corresponds to a normal plane of the same direction)
| Pos | Dia .010 | X | Y | Z |
| Pos | .004 | X | Z |
Alternatively, is it permissible to establish the X and Y seperately (effectively creating a linear X/Y tolerance) e.g.
| Pos | .010 | Y | Z |
| Pos | .004 | X | Z |
I can't seem to find references to single segment or composite tolerancing when it relates to a single feature. Linear tolerancing isn't desired as the location is on two centerlines.
Thanks.
e.g. ( Datum corresponds to a normal plane of the same direction)
| Pos | Dia .010 | X | Y | Z |
| Pos | .004 | X | Z |
Alternatively, is it permissible to establish the X and Y seperately (effectively creating a linear X/Y tolerance) e.g.
| Pos | .010 | Y | Z |
| Pos | .004 | X | Z |
I can't seem to find references to single segment or composite tolerancing when it relates to a single feature. Linear tolerancing isn't desired as the location is on two centerlines.
Thanks.





RE: Single-Segment tolerance for single hole
This will give you a rectangular zone when arguably function by justify an obround zone but I'll leave that up to you to consider.
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Single-Segment tolerance for single hole
IOW, the datum references given in the positional tolerance don't have to correspond on a one-to-one basis with the tolerance you are after. They merely tell everyone how to hold the part.
John-Paul Belanger
Certified Sr. GD&T Professional
Geometric Learning Systems
RE: Single-Segment tolerance for single hole