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trumpy81
Posts: 317
Registered: ‎10-22-2006
Message 11 of 19 (258 Views)

Re: Sweep problem - can't select sketch

04-24-2012 02:44 AM in reply to: rhasell

Reg, thanks for the reply.

 

FYI, I'm not the OP, I'm simply interested in how things are labelled as being self intersecting when I can see no evidence of it in Inventor.

 

In the example part, the geometry to my mind does not show any self intersecting even in the solid state. Granted, the part as drawn could not be manufactured easily, unless it were machined from solid, which would be of no advantage at all and would certainly not be cost effective, but it is possible!

 

So the question remains where and how does this geometry self intersect, according to Inventor at least?

 

Is Inventor seeing the 0.6mm bend radius as being impossible and then declaring self intersection or is there something else that I'm not seeing/understanding?

 

I too, try to follow standard manufacturing processes when designing my own parts, but every now and then I strike this error and I can not understand why. I'm well aware of minimum bend radius, modulus of elasticity etc... for given materials so it would seem unlikely that I would break those rules, yet Inventor tells me otherwise. Of course, I have made some pretty obvious errors, but a lot of the time they are not so obvious and they're the ones that bug me ... lol

Regards
Andy M
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rhasell
Posts: 287
Registered: ‎05-23-2007
Message 12 of 19 (252 Views)

Re: Sweep problem - can't select sketch

04-24-2012 04:16 AM in reply to: mbus0013
Have to agree on Inventor not doing what I ask it to do, or a part breaking a few months down the line, but nine times out of ten, its my fault. Occasionally I dump it and try another route with the same/better results.

This forum is great, I have learnt so much from it, thanks everyo, though I still have unanswered questions with the forum and Autodesk.
Reg.

Reg
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Please accept as a solution if it fixes your problem.
*Expert Elite*
Posts: 25,237
Registered: ‎04-20-2006
Message 13 of 19 (244 Views)

Re: Sweep problem - can't select sketch

04-24-2012 05:07 AM in reply to: trumpy81

trumpy81 wrote:

Next point, you cannot use a 2D sketch and a 3D sketch for the sweep command (as far as I know anyhow).


 

Of course you can.  You might go through the tutorials in my signature (Knot comes to mind).

 

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*Expert Elite*
Posts: 25,237
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Message 14 of 19 (244 Views)

Re: Sweep problem - can't select sketch

04-24-2012 05:08 AM in reply to: trumpy81

trumpy81 wrote:

 I have had some errors reporting self intersecting lines etc... but I could not see any evidence anywhere that a line or other geometry was intersecting itself. 

Attach file here that exhibits this behavior.

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mbus0013
Posts: 12
Registered: ‎02-09-2012
Message 15 of 19 (223 Views)

Re: Sweep problem - can't select sketch

04-25-2012 02:38 AM in reply to: trumpy81

I have edited the holes on the rim, thanks for pointing that out

I have increased the radius of the curve

But no matter what circle I sketch, when I click sweep and try to select is as profile it just won't select it! I can't understand why

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Posts: 25,237
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Message 16 of 19 (217 Views)

Re: Sweep problem - can't select sketch

04-25-2012 04:28 AM in reply to: mbus0013

mbus0013 wrote:

I have edited the holes on the rim, thanks for pointing that out

I have increased the radius of the curve

But no matter what circle I sketch, when I click sweep and try to select is as profile it just won't select it! I can't understand why


Attach the new file here.

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mbus0013
Posts: 12
Registered: ‎02-09-2012
Message 17 of 19 (192 Views)

Re: Sweep problem - can't select sketch

04-30-2012 05:57 AM in reply to: JDMather

In the end I started the wheel from scratch, used a similar method and had no problems with the sweep.

I still don't know why I kept getting this problem but at least I don't have to solve it anymore.

Thanks everyone for trying to help.

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Posts: 25,237
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Message 18 of 19 (189 Views)

Re: Sweep problem - can't select sketch

04-30-2012 06:27 AM in reply to: mbus0013

mbus0013 wrote:

I still don't know why I kept getting this problem but at least I don't have to solve it anymore.


Your sweep would have created a self-intersecting body.  It could have been fixed.

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GlennChun
Posts: 112
Registered: ‎06-10-2004
Message 19 of 19 (167 Views)

Re: Sweep problem - can't select sketch

04-30-2012 11:13 PM in reply to: mbus0013

Back to the original question using your wheel 24.ipt, the reason why you couldn't easily select the circle in Sketch13 as a sweep profile is that there are too many visible sketches that can be a sweep profile.  Especially, the huge circles in Sketch6 get highlighted first as a sweep profile.  If you turn off the visibility of Sketch6, the small circle in Sketch13 can be easily selected.  Otherwise, you could zoom in the small circle and right-click > Select Other > 2. Profile Body.

 

HTH,

Glenn

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