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> How to model spiral gate

bmckelvie
post Jul 8 2017, 11:02 PM
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I have been racking my head trying to figure out how to do this in IronCad

I am trying to model a spiral that starts flat and ends up vertical 270 degrees away.

Think of a thread or auger flute but without the shaft in the middle and that only makes one 270 Degree rotation. I am using it as a gate to control flow, on the flat full flow will be allowed through then if I rotate 270 degrees, no flow will occur.
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bmckelvie
post Jul 9 2017, 10:49 PM
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I found a way but I am not overly happy with the results and found a lot of bugs an limitations in the process.

Using loft I created 2 rectangles 270 degrees apart from each other, and the second one higher than the first. Then I created spiral 3d sketches that went from corner to corner of the rectangles. See Gate_3.png

Then in the loft command I used the important point feature to correct IronCads bizarre default choices for where to loft too.

Ironcad unfortunately leaves weird artifacts around the loft, I sort of got around them by making my loft a larger diameter than it needed to be and then using a hollow pipe to trim the outsides neat.

I also had to work around the fact that Ironcad can not loft to the second rectangle if its bottom corner is the same point and the first rectangles top corner. I got around this by leaving a space, then duplicating the loft lower to fill in the open area left by the workaround.

There are still a few artifacts I need to get rid of, but it is getting close to what I wanted

I attached a few pictures to try to make more sense of this.





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Robert Andersson
post Jul 12 2017, 05:58 AM
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I am not sure exactly what you need but I think you should involve sweep. Loft is a bit to free form.
Maybe this shape can help:


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bmckelvie
post Jul 18 2017, 11:06 PM
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QUOTE(Robert Andersson @ Jul 12 2017, 05:58 AM)
I am not sure exactly what you need but I think you should involve sweep. Loft is a bit to free form.
Maybe this shape can help:
*




Thanks, that is a lot closer to what I was looking for.

This post has been edited by bmckelvie: Jul 18 2017, 11:07 PM
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