ASME standard for dimensioning cut tubing

[blitz97]

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

 

[drawoh]

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

 

[CheckerRon]

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)?

 

[drawoh]

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

 

[CheckerRon]

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.