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learn001
Posts: 10
Registered: ‎02-17-2013
Message 1 of 11 (265 Views)
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Constrains are not working correctly, new to inventor.

265 Views, 10 Replies
02-18-2013 02:04 AM

http://www.youtube.com/watch?v=l6bdGYldFPw

In the video, it says the sketch is fully constrained, yet http://puu.sh/24tJX shows there are still degree's of freedom.

 

I'm really confused and very new to inventor, just tried it out coming from solidworks.

What do the green lines mean, if not unconstrained lines?

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sbixler
Posts: 1,869
Registered: ‎09-15-2003
Message 2 of 11 (245 Views)

Re: Constrains are not working correctly, new to inventor.

02-18-2013 03:43 AM in reply to: learn001

Looks as if you found a way to fool Inventor's sketcher.  But since you wouldn't actually model something that way, it's just for fun, right?

Sam B
Inventor 2012 Certified Professional

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Active Member
learn001
Posts: 10
Registered: ‎02-17-2013
Message 3 of 11 (241 Views)

Re: Constrains are not working correctly, new to inventor.

02-18-2013 03:50 AM in reply to: sbixler

no, this was for an actual model? what would you do differently, this exact thing has worked for me in the past.

Im trying to mock up an enigma machine rotor.

http://en.wikipedia.org/wiki/File:Enigma-rotor-pin-contacts.jpg

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sbixler
Posts: 1,869
Registered: ‎09-15-2003
Message 4 of 11 (233 Views)

Re: Constrains are not working correctly, new to inventor.

02-18-2013 04:03 AM in reply to: learn001

You would normally create the basic disk and sketch one "tooth" and then make a polar array of the tooth.  Much more robust, much easier to control.  You will also find that Inventor won't like your sketch as it currently is, because arraying sketch elements doesn't connect them reliably.  You'll have to place sketch points at each intersection, which could get a little tedious.

 

Post your next attempt here if you're getting stuck.  Changing systems can be challenging, but plenty of expertise here to help out, including many who have made the same transition that you're making.

Sam B
Inventor 2012 Certified Professional

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still waiting for a foreshortened radius dimensioning tool in Drawing Manager

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JDMather
Posts: 26,181
Registered: ‎04-20-2006
Message 5 of 11 (217 Views)

Re: Constrains are not working correctly, new to inventor.

02-18-2013 04:22 AM in reply to: learn001

learn001 wrote:

 

I'm really confused and very new to inventor, just tried it out coming from solidworks.

 


That is not the correct way to model in SolidWorks either.
Pattern Features, not sketches (where appropriate).
In SolidWorks View>Show Sketch Relations.

What do you see?

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Active Member
learn001
Posts: 10
Registered: ‎02-17-2013
Message 6 of 11 (196 Views)

Re: Constrains are not working correctly, new to inventor.

02-18-2013 05:59 AM in reply to: sbixler

Finally worked it out, unsure what a polar array was, but a friend of mine had a go, and worked out it works correctly if you dont have the circle as a construction, draw a tooth, trim it, then circular pattern the tooth.

Then you can add the construction circles back on for dimensioning.

 

One of the reasons that I wanted the teeth drawn on the sketch, is I was hoping to use the teeth in a top down or skeleton model of my assembly, so I can work out the mechanism for driving it from the keyboard.

Would the this work, or am I still just stubbonly trying to make inventor do things "incorrectly"

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sbixler
Posts: 1,869
Registered: ‎09-15-2003
Message 7 of 11 (185 Views)

Re: Constrains are not working correctly, new to inventor.

02-18-2013 06:24 AM in reply to: learn001

What we're suggesting is that you wait to circular (polar) pattern the tooth until you've created one as a feature or set of features, not in your sketch.

Sam B
Inventor 2012 Certified Professional

Please click "Accept as Solution" if this response answers your question.
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still waiting for a foreshortened radius dimensioning tool in Drawing Manager

Valued Mentor
Mason-Paul
Posts: 296
Registered: ‎04-04-2012
Message 8 of 11 (145 Views)

Re: Constrains are not working correctly, new to inventor.

02-18-2013 06:35 PM in reply to: learn001

GOOD LUCK with figuring out how the key link in an Ingma works. It took the boffins at Bletcly Park quite some time.

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Active Member
learn001
Posts: 10
Registered: ‎02-17-2013
Message 9 of 11 (138 Views)

Re: Constrains are not working correctly, new to inventor.

02-18-2013 07:44 PM in reply to: Mason-Paul

Unsure what you mean by key link, but the whole machine is well documented as long as you can find the resources.

Active Member
learn001
Posts: 10
Registered: ‎02-17-2013
Message 10 of 11 (128 Views)

Re: Constrains are not working correctly, new to inventor.

02-19-2013 12:48 AM in reply to: sbixler

so using a simple disc

http://puu.sh/24ZUP

 

a tooth

http://puu.sh/24ZVc

 

and a circular pattern

http://puu.sh/24ZVx

Is this what you mean? if so, how can I dimension it so its driven by the outer diameter, the tooth height, and the angle  based on the fact that there are 26 teeth, and they link to the next one?

http://puu.sh/24ZXa

 

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