Inventor General

## Inventor General

Contributor
Posts: 25
Registered: ‎10-01-2012
Message 1 of 11 (235 Views)

# Simple Extrude Problem?

235 Views, 10 Replies
03-18-2013 05:46 AM

HI

I've been looking at this problem for too long so perhaps someone else can shed some light. I've attached a simple drawing, fully constrained consisting of 3 circles. The smaller circle is further constrained with tangent constraints with the larger two. I've also attached an image showing the area I wish to extrude into 3d. Now if if trim the drawing then the extrude is quite simple, however I want to keep the circles in place so that I can alter their dimensions at will and therefore automatically adjust the dimensions of the extrude at will....any ideas how this can be done?

Roger

Distinguished Mentor
Posts: 531
Registered: ‎11-08-2012
Message 2 of 11 (224 Views)

# Re: Simple Extrude Problem?

03-18-2013 06:05 AM in reply to: Roger456

Might be a simpler way, but make your sketch lines construction and then put 3 circles back over erach one conctraining them to each other (no dimensions) By draging the circle until it touches the other it goes on top of. Then trim those lines. This way you still have the original skecth.

Although if you trim them properly in the right order you will still have your dimensions and it will be editiable.

Steven White
Lee C. Moore, Inc.
www.lcm-wci.com
Inventor 2011
Intel Dual Xeon E31225 @ 3.1 GHz CPU
16 GB RAM
Windows 7 - 64 Bit
Contributor
Posts: 25
Registered: ‎10-01-2012
Message 3 of 11 (216 Views)

# Re: Simple Extrude Problem?

03-18-2013 06:10 AM in reply to: swhite

Thanks for that, though if possible I want to avoid trimming or any other manual operations. The end goal is to be able to parameterise the dimensions so I simply type in the parameties and the 3d part is created ready for dynamic simulation (I need to run hundreds of simulations with different sized extrudes)

Roger

Distinguished Mentor
Posts: 531
Registered: ‎11-08-2012
Message 4 of 11 (211 Views)

# Re: Simple Extrude Problem?

03-18-2013 06:16 AM in reply to: Roger456

Object resizes fine in both examples by simply changing diemnsion values.

Steven White
Lee C. Moore, Inc.
www.lcm-wci.com
Inventor 2011
Intel Dual Xeon E31225 @ 3.1 GHz CPU
16 GB RAM
Windows 7 - 64 Bit
Contributor
Posts: 25
Registered: ‎10-01-2012
Message 5 of 11 (189 Views)

# Re: Simple Extrude Problem?

03-18-2013 07:14 AM in reply to: swhite

oh, I misunderstood you, let me try this and I'll report back...

*Expert Elite*
Posts: 574
Registered: ‎11-05-2003
Message 6 of 11 (181 Views)

# Re: Simple Extrude Problem?

03-18-2013 07:33 AM in reply to: Roger456

Inventor is "seeing" 3 separate closed profiles and doesn't realized you're trying to link them together.  You can do this by using the "point" tool in the sketch (not a work point but the drawing "point" - button left of Text).  While in the sketch click "point" and then click on the 3 joints - the 2 tangents and the cross-over.  Now try extrude

no need to redraw arcs over the top or trim your sketch away to something less easy to relate to.

----------
but please understand that the solution may not be the answer you're wanting to hear...

If you have found any post to be helpful, even if it's not a direct solution, then please provide that author kudos - spread that love

Lithium - helping nntp users with mania, depression and headaches
*Expert Elite*
Posts: 2,448
Registered: ‎03-08-2006
Message 7 of 11 (178 Views)

# Re: Simple Extrude Problem?

03-18-2013 07:35 AM in reply to: Roger456

Hi Roger456,

sam_m beat me to the punch, but here is a link that illustrates his suggestion:

I hope this helps.
Best of luck to you in all of your Inventor pursuits,
Curtis
http://inventortrenches.blogspot.com

Did you find this reply helpful ? If so please use the Accept as Solution or  Kudos button below.

Contributor
Posts: 25
Registered: ‎10-01-2012
Message 8 of 11 (171 Views)

# Re: Simple Extrude Problem?

03-18-2013 07:42 AM in reply to: Curtis_Waguespack

Thanks for both of these, I won't be able to try either of them until I get home tonight. One question about the 'point' solution though - as I said I want to be able to alter the dimensions of the circles - in which case will the points at the intersentions automatically and corrently move as I do so as I'm looking at it and have the horrible feeling that they won't?

Roger

*Expert Elite*
Posts: 2,448
Registered: ‎03-08-2006
Message 9 of 11 (164 Views)

# Re: Simple Extrude Problem?

03-18-2013 07:49 AM in reply to: Roger456

Hi Roger456,

The sketch points are constrained to the intersection of the circles, so as the intersections shift, the points do to. So it should work very well for you.

I hope this helps.
Best of luck to you in all of your Inventor pursuits,
Curtis
http://inventortrenches.blogspot.com

Did you find this reply helpful ? If so please use the Accept as Solution or  Kudos button below.

Contributor
Posts: 25
Registered: ‎10-01-2012
Message 10 of 11 (159 Views)

# Re: Simple Extrude Problem?

03-18-2013 07:50 AM in reply to: Curtis_Waguespack

I'll try that at soon as I get home then....

Recently Solved

Inventor