Undesirable results (fuselage drawing-construction)

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 From:  Marv (MSWRITES)
6853.1 
Hello,
I have some undesirable results. The Moi3d entire file fuse.3dm included is the source. I am using F2r, F3r, & F4r as examples.
I'm copying each component to be cut via export dxf to a folder then to VCarve pro. Attached see dxf exported files F2, F3 & F4
After accessing the dxf files in Vcarve they seem Ok. See attached sample F2-Vcarve.
After cutting the pieces look like this as seen in moi3d-vcarve. Notice the unacceptable areas noted in red.

Question: How do I solve this problem?

Next question: How do I get rid of the unwanted line in picture?

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 From:  bemfarmer
6853.2 In reply to 6853.1 
Hello Marv.

To get rid of the line at the rear, delete the surface there. The edge then goes away.

I'll look at the rest later, unless others answer first :-)

I've used Moi with Aspire, the relative of vcarve pro, with excellent results. I think I used Moi PDF.
So a question is, is it DXF "difficulty," or vcarve pro setup "difficulty?"

Or a CNC difficulty?

Do your parts usually cut out correctly?

- Brian
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 From:  Marv (MSWRITES)
6853.3 In reply to 6853.2 
I've tried deleting the surface. Cannot find any portion to delete

Yes, parts cut normally using Turbocad 18 or Coral Cad.

I'll try the pdf routine

thanks
marv
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 From:  bemfarmer
6853.4 In reply to 6853.2 
It appears that the 3 cross sections are not planar.
There is an align command.


Is the CNC z axis getting involved? The "divits" and miscuts are considerable


I just drag the mouse to select the vertical looking object and hit delete.

Still looking, I'll try an aspire import.

Brian

Also, there is a vectric forum to ask questions on VCpro...
http://forum.vectric.com/

EDITED: 10 Aug 2014 by BEMFARMER

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 From:  Michael Gibson
6853.5 In reply to 6853.3 
Hi Marv for the deleting part it can be a little difficult to click select a surface that is a very very thin sliver. For a case like that you may want to use window select instead, see here for an example:




- Michael
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 From:  bemfarmer
6853.6 In reply to 6853.4 
Each of the 3 sections are not flat. I placed a plane at the origin, and projected F2 onto it.
This will slightly change the sizes.
The right side did not quite mirror the left side either.

I suspect the the additional y dimension values are what is messing up the Vcarve Pro cut???

- Brian
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 From:  bemfarmer
6853.7 In reply to 6853.6 
After projecting flat, all three sections are not mirror symmetrical.
F2 and F3 just needed part of right hand adjusted.
F4 is then very non-symmetrical. I did cleanups of the three, but they will
vary in dimensions, so no point in uploading them...

- Brian
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 From:  Michael Gibson
6853.8 In reply to 6853.6 
Hi Brian, the DXF files though seem to be all flattened so they're probably projected down to no z values already in those ones.

@Marv - I don't really have any idea why the cuts are not going properly, you will probably need to contact VCarve tech support to find out why the cuts are getting clipped in some areas. I would have thought that if there was some problem with the DXF import itself you would probably see the problem right on screen in VCarve Pro...

- Michael
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 From:  Marv (MSWRITES)
6853.9 In reply to 6853.5 
Thank you Michael. That worked. The pesky line is now gone.

Marv

EDITED: 10 Aug 2014 by MSWRITES

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 From:  bemfarmer
6853.10 In reply to 6853.8 
Good point Michael.

(Moi PDF save also can do projected flat...)

Hi Marv.

I imported your F2dxf into Moi, adjusted and closed the right hand side, and joined. I did not worry about symmetry.
I suggest joining the lines and curves in Moi before the dxf save.


Re-Saved from Moi as dxf.
Opened F2Joined.dxf in Aspire, thicknes 0.125. (I do not have Vcarve Pro.)
Created outside toolpath, for the perimeter.

For the very slender top slot, had to use a virtual end mill of .06 inches. (very tiny).
Shift selected all of the remaining inside toolpath cuts, and created toolpath with the .06 endmill.

Virtual cuts look good.

Your cuts look like the material moved around during CNC cutting. Or... (?)
I would say that Moi is not the problem. A little cleanup and joining before dxf save would be beneficial.

- Brian

What are you using to cut with? Laser?





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 From:  bemfarmer
6853.11 In reply to 6853.10 
Maybe the tiny endmill is bending?
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 From:  Marv (MSWRITES)
6853.12 In reply to 6853.11 
Hi Brian,
You are right on the planes. I went back in and fixed them in moi3d also closed up the polylines. I usually close all the lines in TurboCad as It has the provision of selecting duplicate lines. I wish moi3d did. I then exported via pdf file, checked it and opened it in Vcarve. That came in clean and cut really nice.

The only problem I have exporting pdf is I can only import to Vcarve. That puts my CoralCad and TurboCad out of use. so I have to re-orient to 0,0 using Vcarve. That's ok as there i can clean up duplicate lines

I think the big culprit was as you said " not planar " Is there a way to align without re-drawing? I'm presently on F8 with 3 to go.

I'm doing this fast so I might not be clear. I'm thinking faster than I tyoe.

Here's a couple attachments to help clear it up.

You sure have been a big help. I'm new so I need it.

Thanks again.

Marv
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 From:  Michael Gibson
6853.13 In reply to 6853.12 
Hi Marv,

> Is there a way to align without re-drawing?

Yeah one way is to switch to a view where you're viewing the curves edge-on to their plane, and then use the corner sizing grips to squish it down until you get "flat snap" engaged. There's an animated example here: http://moi3d.com/forum/index.php?webtag=MOI&msg=3378.4

You can also draw a plane surface and use Construct > Curve > Project to project curves onto that plane surface.

- Michael
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 From:  bemfarmer
6853.14 In reply to 6853.12 
Hi Marv

Very cool fuselage you are modeling!
Please update us down the road.

- Brian

I think the Moi dxf file export is excellent also.
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