【转帖】asme standard for dimensioning cut tubing
 

asme standard for dimensioning cut tubing
is there a place int he asme standard that specifies how to dimension a stock tube cut to length with an angle on the end. i am getting different interpretations on dwgs i am seeing.
options:
1)overall length and an angle
2)length on each side of the tube
3)something else
thanks
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awidrig,
i am not aware of a specific asme procedure for dimensioning cut tubes. overall length and angle, and length on each side of the tube are interpretable by asme y14.5m-1994. i, personally, would prefer overall length and an angle.
is this process tubing, or are these precision machined parts?
if this is a precision machined part, your overall length with a ± tolerance, is ambiguous. the machinist is going to take the sharp edge off, and this will affect your as-measured length. if your length and angle are basic dimensions, you can apply profile and angle tolerances to the angled face. this makes for a precise definition of your tube end.
jhg
drawoh:
where are you envisioning the basic length dimension of the tube to terminate? at the oal of the tube? at the center of the angle (centerline of the tube)?

checkerron,
i have designed and drawn up a number of 45° mirror mounts, which present the precise dimensioning problem described above (by me, if not by the op).
i show the height to the top, sharp corner. it has never occured to me to dimension to the centre. the maximum height is more useful to a machinist. the centre height requirement is to the top face of the optic, and is shown elsewhere in my documentation. a sloppy diameter does affect the position of the angled face.
on occasion, i have drawn phantom lines off to the side, and applied a basic dimension to the vertex.
however you do it, the feature is not directly measurable. you have to specify a basic dimension, and attach an fcf to the angled face.
my drawings are to a large enough scale that there is no confusion about what i am dimensioning to. i do not see a way around this. if you want to do single-line tubing isometrics, you are going to have to cut your tubes off straight.
jhg
drawoh:
actually i would dimension it to the oal the same as you, and not to the centreline of the tube, but the question popped in my mind as i read your third paragraph.
i'm not sure why (in retrospect) since you did say straightaway that you preferred overall length and angle.
i guess i got sidetracked in that discussion about rounding off the corner.
respectfully, i am trying to use my best english english. my buddy kenat would appreciate that.