control of cylindrical features with intersecting axes
control of cylindrical features with intersecting axes
(OP)
I have a part with two cylindrical surfaces. The axes of the two cylinders are designed to be intersecting at an 8 degree angle, with the point of intersection dimensioned from the end of one of the cylinders. What is the correct way to control this so the axes actually intersect within a specified tolerance?





RE: control of cylindrical features with intersecting axes
RE: control of cylindrical features with intersecting axes
RE: control of cylindrical features with intersecting axes
If that is the case, assign dia. A as datum feature A, make inclined surface as datum feature B, switch dimension C to basic, put basic angular dimension between axes A and B and apply positional feature control frame |pos|dia. .0003|A|B| or |pos|dia. .0003|B|A| (depending on function) to dia. B. Define angular relationship between datum features A & B by applying proper angularity tolerance and that will do the thing.
RE: control of cylindrical features with intersecting axes
Will annotation be equal to position tolerance from point of GD&T according to both ASME and ISO?
Is it correct applied where design intent is mutual axes intersect within tolerance to cross holes?
RE: control of cylindrical features with intersecting axes
Regardless of your answer, I would say the note needs improvement - like adding diameter symbol in front of 0.1 value (just as an example), if the zones are going to be cylinders - and even with that, this will merely control relationship between each 3-step bore and corresponding dia. 30 cylinders, but will not control mutual angular relationship of bores. If we assume for a moment that the goal is to have the bores inclined at approximately 30 degrees, your note will not control this at all - there might as well be actual 40 or 50 degrees angle between bores and the note will not have any control over it.
Therefore I would strongly recommend use of symbols with the remark though that probably it will not be easy to cover both ASME & ISO interpretations of positional tolerances simultaneously. These are, by defintion, different geometrical requirements.
RE: control of cylindrical features with intersecting axes