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Constrains are not working correctly, new to inventor.

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Message 1 of 11
learn001
798 Views, 10 Replies

Constrains are not working correctly, new to inventor.

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?

10 REPLIES 10
Message 2 of 11
SBix26
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

Please click "Accept as Solution" if this response answers your question.
-------------------------------------------------------------------------------------
Inventor Professional 2013 SP1.1 Update 1
Windows XP Pro 32-bit, SP3
HP EliteBook 8730w; 4 GB RAM; Core™ 2 Duo T9400 2.53 GHz; Quadro FX2700M
SpaceExplorer/SpaceNavigator NB, driver 3.7.18
still waiting for a foreshortened radius dimensioning tool in Drawing Manager

Message 3 of 11
learn001
in reply to: SBix26

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

Message 4 of 11
SBix26
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

Please click "Accept as Solution" if this response answers your question.
-------------------------------------------------------------------------------------
Inventor Professional 2013 SP1.1 Update 1
Windows XP Pro 32-bit, SP3
HP EliteBook 8730w; 4 GB RAM; Core™ 2 Duo T9400 2.53 GHz; Quadro FX2700M
SpaceExplorer/SpaceNavigator NB, driver 3.7.18
still waiting for a foreshortened radius dimensioning tool in Drawing Manager

Message 5 of 11
JDMather
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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Message 6 of 11
learn001
in reply to: SBix26

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"

Message 7 of 11
SBix26
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.
-------------------------------------------------------------------------------------
Inventor Professional 2013 SP1.1 Update 1
Windows XP Pro 32-bit, SP3
HP EliteBook 8730w; 4 GB RAM; Core™ 2 Duo T9400 2.53 GHz; Quadro FX2700M
SpaceExplorer/SpaceNavigator NB, driver 3.7.18
still waiting for a foreshortened radius dimensioning tool in Drawing Manager

Message 8 of 11
Paul-Mason
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.

==============
Inventor 2023 Pro
HP Z420 workstation
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64bit (The Garbage known as) Windows 10 Pro
AMD FirePro V3900 (ATI FireGL) (1GB RAM)
=================
Ashington Northumberland (UK) ~ Home to the WORLD FAMOUS Pitman Painters Group
Message 9 of 11
learn001
in reply to: Paul-Mason

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

Message 10 of 11
learn001
in reply to: SBix26

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

 

Message 11 of 11
SBix26
in reply to: learn001

Feature 1: plain disk, 90 mm diameter, thickness as you please.

Feature 2: one tooth profile cut through the disk

Feature 3: circular pattern of Feature 2, 26 copies, axis = origin Z axis

 

See attached image.  Inventor is quite capable in the mathematics field, so if you just ask it to work out 1/26th of a circle it will be happy to do so.  If you create user parameters for the number of teeth and the tooth height, and incorporate these in feature parameters, you can have a very flexible and robust part.

Sam B
Inventor 2012 Certified Professional

Please click "Accept as Solution" if this response answers your question.
-------------------------------------------------------------------------------------
Inventor Professional 2013 SP1.1 Update 1
Windows XP Pro 32-bit, SP3
HP EliteBook 8730w; 4 GB RAM; Core™ 2 Duo T9400 2.53 GHz; Quadro FX2700M
SpaceExplorer/SpaceNavigator NB, driver 3.7.18
still waiting for a foreshortened radius dimensioning tool in Drawing Manager

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