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WHY WONT THIS SHAPE EXTRUDE

14 REPLIES 14
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Message 1 of 15
Forumhelp2012
1619 Views, 14 Replies

WHY WONT THIS SHAPE EXTRUDE

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.

14 REPLIES 14
Message 2 of 15
JDMather
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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Message 3 of 15
Cadmanto
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
(Colossians 3:23-25)


Message 4 of 15
JDMather
in reply to: Cadmanto

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


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Message 5 of 15
JDMather
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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Message 6 of 15
JDMather
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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Message 7 of 15
JDMather
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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Message 8 of 15
JDMather
in reply to: JDMather

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

 

Step3.png


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Message 9 of 15
JDMather
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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Message 10 of 15
JDMather
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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Message 11 of 15
JDMather
in reply to: JDMather

The profile should now extrude fine.

 

Very rarely do I use Mirror tool in Sketch environment.

If you count the number of mouse clicks I will wager my technique was fewer clicks that that on the YouTube video.

 

In any case, Inventor often has trouble combining coincident points when using Mirror.

If I need a Symmetry constraint - I will add it myself rather than doing Mirror.

 

Extrude.PNG


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Message 12 of 15
JDMather
in reply to: JDMather

If we assume (which I think is a safe assumption) that the design intent was really  for those arcs to be tangent - the curve is just slightly different.

(both curves shown)

 

tangent.PNG


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Message 13 of 15
Squawk
in reply to: JDMather

Hi JD,

 

Mm.. I would have expected a "thank you" or similar sort of reply to your posting from him..

 

Anyway, I hope you'll still read this old thread..

 

How did you make that arc feature tangent to the the filet?

Did that depend on where you put the first 2 points of the arc?

Or did you constrain that?

Message 14 of 15
JDMather
in reply to: Squawk

Click the points for the arc anywhere except for the endpoints of the existing arcs.

Then add the Tangents yourself.


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Message 15 of 15
Squawk
in reply to: JDMather

Ah, just got it. Was doing something wrong while trying this earlier..

 

Thanks JD!

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