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Cutting Tangent Holes (Image Heavy)

Question asked by Kim Panattoni on Jun 18, 2014
Latest reply on Jun 20, 2014 by Kim Panattoni

Hello everyone,

 

I realize that this is my first post, so I'll try to keep this as to the point as possible.

 

I have a model that is basically a flying saucer. It is round, and it has an edge that tapers inward from the top to the bottom. I have to cut windows in it, and they need to be tangent with the surface, and cut through it at a level. The two problems I am having with this are as follows.

 

According to the design:
1. The holes sometimes have to be cut in places that are not at cardinal points, like 12, 6, and 9 o'clock.

2. All of the tools I've tried, having searched here, and through various videos and the help files, do not seem to help me. Here are some graphic examples.

 

 

First, the part:

 

Screen Shot 2014-06-17 at 11.59.47 PM.png Screen Shot 2014-06-18 at 12.18.05 AM.png

 

Next, setting up a tangent surface on a cardinal point:

 

Screen Shot 2014-06-18 at 12.02.41 AM.png Screen Shot 2014-06-18 at 12.02.52 AM.png

 

Next, the sketch:

 

Screen Shot 2014-06-18 at 12.22.34 AM.png

 

Now, with Cut-Extrude:

 

Screen Shot 2014-06-18 at 12.23.09 AM.png Screen Shot 2014-06-18 at 12.23.38 AM.pngScreen Shot 2014-06-18 at 12.23.16 AM.png

Screen Shot 2014-06-18 at 12.24.30 AM.png Screen Shot 2014-06-18 at 12.24.51 AM.png

 

Note that no matter what option I choose, the cuts start out parallel to the sketch, but begin to curve up as more of them are added. This is undesirable. They need to stay parallel.

 

So I tried a different tool:

 

Screen Shot 2014-06-18 at 12.26.11 AM.png Screen Shot 2014-06-18 at 12.26.19 AM.png

 

Ok, so debossing through the surface, which is 1/8" thick, is not working.

 

Then I tried to create a Surface-Extrude:
Screen Shot 2014-06-18 at 12.29.06 AM.png Screen Shot 2014-06-18 at 12.29.14 AM.png

 

Now, I realize that it is going the wrong direction, but the cut is still not remaining parallel to the sketch. How do I fix this?

 

 

On to problem 2.

 

I mentioned that at times, I have to cut from different points on the model, so I create a tangent surface in the same way, but I get this:
Screen Shot 2014-06-18 at 12.15.48 AM.png Screen Shot 2014-06-18 at 12.17.20 AM.png

 

This is horrible, because I need to sketch according to the global coordinate system, not according to what the plane defines as horizontal and vertical. I've been able to set up a ton of references in order to establish true horizontal/vertical, but I'd really rather not. Is there a way to create a plane on a surface such as this that will be parallel like when I set it up at 12, 6, or 9 o'clock?

 

Please tell me what I am missing, I feel I've tried everything.

 

Thanks in advance!

 

-David Andrews

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