Inventor General Discussion

Inventor General Discussion

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*Expert Elite*
mrattray
Posts: 2,473
Registered: ‎09-13-2011
Message 11 of 23 (241 Views)

Re: Question regarding IV2013 improvements

05-30-2012 12:19 PM in reply to: acad-caveman

Ahhhh, I see, I thought you meant the profile of the cylinder edge where the hole's cylinder intersects. And a quick test verifies that you are indeed correct that IV is turning a perectly good circle into a spline.

Unfortunately, I don't know of any way around this offhand. I'll think about it and post back if I have any ideas.

 

Mike (not Matt) Rattray

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bobvdd
Posts: 549
Registered: ‎11-23-2005
Message 12 of 23 (205 Views)

Re: Question regarding IV2013 improvements

06-11-2012 06:10 PM in reply to: mrattray

I don't see either how you can avoid the splines on a cylinder-cylinder intersection after exporting the IDW to AutoCAD.

A possible (although painful) remedy is to use the FLATTEN command from the AutoCAD bonus tools to convert splines back to arcs (but you will probably get a lot of arcs instead of the expected single circle).

 

Bob

Distinguished Contributor
acad-caveman
Posts: 165
Registered: ‎08-21-2009
Message 13 of 23 (192 Views)

Re: Question regarding IV2013 improvements

06-11-2012 10:23 PM in reply to: bobvdd

Please note that IT IS NOT !!! a cylinder-cylinder intersection!!!

It is a view from a plane that is normal to the axis of the through hole.

Regardless of what solid body the hole goes through - cylinder, angled surface or any other irregular nonplanar surface, it is a hole.

IOW If I created it as a hole feature or a circular cut from a plane, it should always be a full circle when viewed from the same plane, no matter what.

 

This problem has existed in Inventor 2010, 2011, 2012 and now in 2013 as well. It was incorrect in 2010 and it remains to be incorrect in 2013. I cannot think of any reasonable explanation for this to be so.

 

*Expert Elite*
mrattray
Posts: 2,473
Registered: ‎09-13-2011
Message 14 of 23 (177 Views)

Re: Question regarding IV2013 improvements

06-12-2012 05:24 AM in reply to: acad-caveman

Well I don't see it as inexplicable, it makes sense if you think about it from a program's point of view. Even though in the 2D world that shape is a true circle, in the 3D world that edge is not. As we know IV looks to the 3D model for all of it's information, so it's not surprising to me that it would translate that geometery to a spline. Incorrect, but not inexplicable.

 

I made this to test a theory I had for you. It didn't work but the image might save you some typing explaining the problem.

capture.jpg

Mike (not Matt) Rattray

Product Support
bobvdd
Posts: 549
Registered: ‎11-23-2005
Message 15 of 23 (168 Views)

Re: Question regarding IV2013 improvements

06-12-2012 08:35 AM in reply to: mrattray

I don't expect we will change this behavior anytime soon.

 

If it holds you back in your AutoCAD work, what I would suggest is to work with a drawing sketch that is "associated" to the view (= select the view first and then use the "Create sketch" command)  and project all geometry from the view into that sketch and then use this sketch block in AutoCAD to do your CNC work.

 

It looks like the projection operation restores the circles or arcs as long as your view direction is parallel to the hole direction.

 

Bob

*Expert Elite*
blair
Posts: 4,021
Registered: ‎11-13-2006
Message 16 of 23 (157 Views)

Re: Question regarding IV2013 improvements

06-12-2012 09:32 AM in reply to: bobvdd

This might give a better understanding of how Inventor displays your model in a IDW. The first capture I used my SpacePilot to rotate the drawing 90 The large verticle line to the very left is the drawing sheet. The second capture is the normal view.

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IV2015 up2 PDSU / Sim Mech 2015 /
Win7-64
EVGA X79 - Classified, iCore7 3930k 32Gb Quad-Channel
950Gb (2 x 500Gb Sata III SSD RAID0 Adaptec 6805E Controller)
Nvidia GTX-690 Classified - 335.23
SpacePilot Pro 3.17.7, 6.17., 4.11
Distinguished Contributor
acad-caveman
Posts: 165
Registered: ‎08-21-2009
Message 17 of 23 (152 Views)

Re: Question regarding IV2013 improvements

06-12-2012 09:36 AM in reply to: mrattray

With the risk of sounding like an absolute jerk, that is quite disappointing. Specially the fact that you've called it

a "behavior" instead of a "mis-behavior".

This, coming from the company that is arguably one of the strongest pillars of the CAD industry, is truly disappointing.

 

Really, I should project edges in Inventor (Adesk) and export them into AutoCAD (Adesk) to get usable geometry?

Is that really the best that Autodesk can and will do?

 

Believe it or not, I do have another workaround as well.

I can take my Inventor solid and export it as STEP. I then take the STEP file in Solidworks 2007, create the drawing views, save them as DWG and use that in my further work.

Would you recommend that Inventor subscription cutomers go out and purchase a copy of Solidworks if they want their solid models transferred properly into an AutoCAD DWG?

 

 

mrattray:

 

Thank you for your replies. In response to your theory, please look at the attached drawing.

You'll see that the cylinder-cylinder transition of the two extrusions produce a true line when viewed from a normal plane, yet the very same view produces a spline for the hole.

Note that neither of those entities are actually intersecting the plane, but are at a varyiung distance from it, yet the line comes out correct, while the hole does not.

 

 

 

 

Distinguished Contributor
acad-caveman
Posts: 165
Registered: ‎08-21-2009
Message 18 of 23 (99 Views)

Re: Question regarding IV2013 improvements

06-18-2012 01:36 PM in reply to: mrattray

"""

If it holds you back in your AutoCAD work, what I would suggest is to work with a drawing sketch that is "associated" to the view (= select the view first and then use the "Create sketch" command)  and project all geometry from the view into that sketch and then use this sketch block in AutoCAD to do your CNC work.

 

It looks like the projection operation restores the circles or arcs as long as your view direction is parallel to the hole direction.

"""

 

 

  Ok, there must be something I'm missing.

I've tried just about everything, and no matter what, none of the projected edges show up in AutoCAD.

I can draw a circle in the sketch and it will transfer just fine, but projected edges do not.

I can "trace" the projected linear edges by drawing lines from endpoints to endpoints and they will show, but I cannot "trace" the projected circle because it is apparently a spline in Inventor DWG as well. IOW if I want to create a circle to overlay the projected edge, I cannot snap to it's center point because it does not have one.

 

Can someone please suggest what I might be doing wrong???

 

 

Thank You

 

 

Product Support
bobvdd
Posts: 549
Registered: ‎11-23-2005
Message 19 of 23 (94 Views)

Re: Question regarding IV2013 improvements

06-18-2012 01:49 PM in reply to: acad-caveman

Use "Break link" command on the projected edges and remove the "Sketch only" property from those projected edges.

You will of course also have to make the edges in the drawing view invisible to avoid displaying duplicates.

 

Bob

Distinguished Contributor
acad-caveman
Posts: 165
Registered: ‎08-21-2009
Message 20 of 23 (82 Views)

Re: Question regarding IV2013 improvements

06-18-2012 02:45 PM in reply to: mrattray

Bob Thank You, that worked .... to show the projected edges that is.

Unfortunately the projected edge in the sketch is still a spline.

As soon as the link is broken, the control points of the spline become visible and ... well it isn't a circle any more, not even in Inventor.

 

 

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