Inventor General Discussion

Inventor General Discussion

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Forumhelp2012
Posts: 18
Registered: ‎10-02-2012
Message 1 of 15 (498 Views)

WHY WONT THIS SHAPE EXTRUDE

498 Views, 14 Replies
10-24-2012 07:39 AM

Hello

I am following U-Tube tutorial called "Table plastic video tutorial Autodesk Inventor 2010"

I am up to time stamp 4 minutes. I should be extruding the shape by 1.5 inch.

Although there are lines under lines they are construction lines underneath.

I could do with some help here I can't figure it out why it wont find the part closed to do the extrude.

 

 

http://www.youtube.com/watch?v=HV7XZVY94o4&feature=relmfu

 

I have attached the part too.

Kind regards

A CAD Student.

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JDMather
Posts: 26,545
Registered: ‎04-20-2006
Message 2 of 15 (488 Views)

Re: WHY WONT THIS SHAPE EXTRUDE

10-24-2012 07:59 AM in reply to: Forumhelp2012

You are doing pretty good so far.  But there are a couple of problems.

When I see repeated dimensions like this - I suspect something wrong.

 

Repeated Dimensions.PNG

 

Also, I haven't watched the video yet, but I suspect those arcs and lines are supposed to be tangent.

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Cadmanto
Posts: 3,240
Registered: ‎12-07-2011
Message 3 of 15 (486 Views)

Re: WHY WONT THIS SHAPE EXTRUDE

10-24-2012 08:00 AM in reply to: Forumhelp2012

Typically when things don't extrude it is because the sketch is not completely enclosed.

Even though you are saying the lines under the lines are construction lines I would sugest deleting them

and getting a clean enclosed sketch.

Best Regards,
Scott McFadden
Inventor Professional 2013
(Colossians 3:23-25)

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JDMather
Posts: 26,545
Registered: ‎04-20-2006
Message 4 of 15 (484 Views)

Re: WHY WONT THIS SHAPE EXTRUDE

10-24-2012 08:05 AM in reply to: Cadmanto

OK, just watched the video - that person has not particularly experienced.

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JDMather
Posts: 26,545
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Message 5 of 15 (471 Views)

Re: WHY WONT THIS SHAPE EXTRUDE

10-24-2012 08:17 AM in reply to: JDMather

If I take the time to show you the steps to do this correctly, are you going to stick around to follow the instructions?

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JDMather
Posts: 26,545
Registered: ‎04-20-2006
Message 6 of 15 (465 Views)

Re: WHY WONT THIS SHAPE EXTRUDE

10-24-2012 08:26 AM in reply to: JDMather

Step 1 create rectangle and then diagonal line as shown.

Then add coincident costraint between midpoint an origin (don't use the horizontal and vertical constraint as shown in the video, it would work and doesn't really matter in this case, but develop a better technique.  In 2013 there is a centerpoint rectangle to do this for you.  For 2012 there is a centerpoint rectangle Add-in avialable somewhere (a Google search should turn up the download link.))

 

Step1.png

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JDMather
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Message 7 of 15 (454 Views)

Re: WHY WONT THIS SHAPE EXTRUDE

10-24-2012 08:41 AM in reply to: JDMather

Dimension the rectangle with the dimensions as shown.

Add R.75 fillet to the four corners.

Add vertical 7.75 line as shown.

 

Step2.png

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JDMather
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Message 8 of 15 (452 Views)

Re: WHY WONT THIS SHAPE EXTRUDE

10-24-2012 08:44 AM in reply to: JDMather

Using crossing window (right to left) select these lines and change to construction.

 

Step3.png

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JDMather
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Message 9 of 15 (449 Views)

Re: WHY WONT THIS SHAPE EXTRUDE

10-24-2012 08:48 AM in reply to: JDMather

On the next step the YouTube shows this arc as NOT tanget, so we'll assume that is the design intent.

Create a 3-point arc at the endpoints of the fillets as beginning and ending point and the the end of the 7.75 construction line as the third point.

 

Step4.png

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JDMather
Posts: 26,545
Registered: ‎04-20-2006
Message 10 of 15 (433 Views)

Re: WHY WONT THIS SHAPE EXTRUDE

10-24-2012 09:22 AM in reply to: JDMather

Now just fun - dimension this arc (it should already be fully constrained).  See where the YouTube got that silly dimension.

 

silly dimension.png

 

Much easier to type 7.75

 

Create  the same arc at bottom but just click in space for the third point and then make the two arc Equal (=) constraint/.

(don't dimension, don't mirror)

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