Behavior of Angled Tubing

Discussion created by Chris Dolejska on Dec 23, 2008
Latest reply on Dec 23, 2008 by Chris Dolejska

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Wondering if this is normal

Drawing a medium complex tubing frame structure of 1.5" x 1.5" x .083 wall steel.

the bottom, 2 sides and, 2 ends of the structure are normal to the top, front, and right planes. But the 2 front corners have a diagonal structure connecting the sides and ends. The tubing sides in these corners are supposed to be perpendicular to the top plane. But the tubing created in these diagonal corners won't stay perpendicular to the top plane, it's off like 2 degrees. Double checked the sketch and it's all perpendicular.

In the pic the highlighted faces are the ones that aren't perp. the compete top rail was created with one "structural member". You can see the center front were the top rail is mirrored, there's a kink in the middle of the tube because the faces are off 2 degrees.

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Roy Potter Dec 23, 2008 12:58 PM

Is the structure symmetrical at the front?
If so is the opposite side working?

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1-GFEX8U Dec 23, 2008 1:13 PM

Odd, you may try the locate profile settings or try to make seperate features instaed of one full of sections.

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Chris Dolejska Dec 23, 2008 3:01 PM

Roy Potter wrote:

Is the structure symmetrical at the front?

If so is the opposite side working?

It's symmetrical and mirrored. That's what showed that the faces weren't perpendicular to the top plane. The kink in the middle of the front top tube.

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Chris Dolejska Dec 23, 2008 3:25 PM

mike chez wrote:

Odd, you may try the locate profile settings or try to make seperate features instaed of one full of sections.

That was it, separate the sections into more separate features.

Of the two tubing sections hi-lighted the one on the left, it's path sketch is not regular to any of the normal planes.

I had made one long feature starting with the longest top side tube first then the left hi-lighted one then the right hi-lighted one. It twisted the left hi-lighted one, and subsequently the right one.

To get it to work, had to make just a two piece section, picking the right hi-lighted one first, then the left. When the left one was picked first it twisted the same way.

If just the left is picked by itself then you have to align it under feature settings.

Apparently all the issues arise from the fact that the path sketch line has to be parallel to at least one of the 3 origin planes, otherwise the feature has to be aligned. It can align if the first section picked is parallel to an origin plane and the second non-normal section has any plane in common with the first.

The right hi-lighted section is parallel to the top plane, so picking that one first aligned the feature because the two hi-lighted sections are in the same vertical plane. Picking the long tube first didn't work because the long tube and the left hi-lighted tube don't have any planes in common.

This was a difficult problem to even see at first because the angle was just barely off, like 2.5 degrees. It showed visually when mirroring the front tube, it left a kink which didn't go away when the mirrored halves were combined. The bad tube sections were found with "measure" which showed the side faces were not parallel but had a 177.5 degree angle between them.

I hope this is clearer than mud

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4 Replies

Roy Potter Dec 23, 2008 12:58 PM
Is the structure symmetrical at the front?
If so is the opposite side working?
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1-GFEX8U Dec 23, 2008 1:13 PM
Odd, you may try the locate profile settings or try to make seperate features instaed of one full of sections.
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Chris Dolejska Dec 23, 2008 3:01 PM
Roy Potter wrote:

Is the structure symmetrical at the front?

If so is the opposite side working?
It's symmetrical and mirrored. That's what showed that the faces weren't perpendicular to the top plane. The kink in the middle of the front top tube.
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Chris Dolejska Dec 23, 2008 3:25 PM
mike chez wrote:

Odd, you may try the locate profile settings or try to make seperate features instaed of one full of sections.
That was it, separate the sections into more separate features.

Of the two tubing sections hi-lighted the one on the left, it's path sketch is not regular to any of the normal planes.

I had made one long feature starting with the longest top side tube first then the left hi-lighted one then the right hi-lighted one. It twisted the left hi-lighted one, and subsequently the right one.

To get it to work, had to make just a two piece section, picking the right hi-lighted one first, then the left. When the left one was picked first it twisted the same way.

If just the left is picked by itself then you have to align it under feature settings.

Apparently all the issues arise from the fact that the path sketch line has to be parallel to at least one of the 3 origin planes, otherwise the feature has to be aligned. It can align if the first section picked is parallel to an origin plane and the second non-normal section has any plane in common with the first.

The right hi-lighted section is parallel to the top plane, so picking that one first aligned the feature because the two hi-lighted sections are in the same vertical plane. Picking the long tube first didn't work because the long tube and the left hi-lighted tube don't have any planes in common.

This was a difficult problem to even see at first because the angle was just barely off, like 2.5 degrees. It showed visually when mirroring the front tube, it left a kink which didn't go away when the mirrored halves were combined. The bad tube sections were found with "measure" which showed the side faces were not parallel but had a 177.5 degree angle between them.

I hope this is clearer than mud
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Behavior of Angled Tubing

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