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oneloosecrank
Posts: 26
Registered: ‎08-30-2013
Message 11 of 38 (248 Views)

Re: assembly constraints and other Qs

10-06-2013 04:13 AM in reply to: oneloosecrank
I completely understand. As a regular contributor in another community, it's a real bore when we take time to assist someone who then dissapears never to be heard from again. My aim is to fabricate this very design as a prototype to a future bike. I have spent the last year coming up with a design that I have intend to build and maybe in the future sell. However, whilst I can design frames on paper, I do need to learn cad to get dimensions and part files for cncing.
Active Contributor
oneloosecrank
Posts: 26
Registered: ‎08-30-2013
Message 12 of 38 (246 Views)

Re: assembly constraints and other Qs

10-06-2013 04:15 AM in reply to: oneloosecrank
I intend to be around cad for a while and will probably be asking lots of questions until I can produce independently. Sorry for double post, phone wouldn't let me edit the first.
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JDMather
Posts: 26,246
Registered: ‎04-20-2006
Message 13 of 38 (240 Views)

Re: assembly constraints and other Qs

10-06-2013 04:27 AM in reply to: oneloosecrank

If you are persistant the users here will help you for as long as it takes.

 

You did not include the part Main triangle.ipt in this thread.

I have an earlier part with that name, but Inventor does not see it as your current assembly part and I get constraint errors. 

 

Can you attach your current Main triangle.ipt here.

 

I notice that most of your part sketches are not fully defined.

I recommend reading this

http://home.pct.edu/~jmather/SkillsUSA%20University.pdf

 

 

Please mark this response as "Accept as Solution" if it answers your question.
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Active Contributor
oneloosecrank
Posts: 26
Registered: ‎08-30-2013
Message 14 of 38 (239 Views)

Re: assembly constraints and other Qs

10-06-2013 04:31 AM in reply to: oneloosecrank
Ah OK, will do. I'll attach when I go in for lunch. I think this define sketches is causing me lots of issues - I'll need to study up on that. Cheers
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oneloosecrank
Posts: 26
Registered: ‎08-30-2013
Message 15 of 38 (225 Views)

Re: assembly constraints and other Qs

10-06-2013 06:51 AM in reply to: oneloosecrank

Triangle attached. The yoke might be needed as well now as I started on it this morning.

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JDMather
Posts: 26,246
Registered: ‎04-20-2006
Message 16 of 38 (209 Views)

Re: assembly constraints and other Qs

10-06-2013 10:03 AM in reply to: oneloosecrank

Once you learn how Inventor assigns assembly constraints - most of the work is done by Inventor for you automatically.

For example, by click, hold and drag a line off of an arc - the Tangent Constraint is added automatically.  By click, hold and drag off of a line endpoint (while still in the line command) an tangent arc can be created.

 

Zoom (way) in on the location in attached image.

What do you see?

 

Why you are fixing this - add tangents to your arcs and lines.

 

In order for me to manufacture something out on the shop floor - it should be fully defined.

So why shouldn't the designer do this work before sending to manufacturing?

 

 

Please mark this response as "Accept as Solution" if it answers your question.
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Autodesk Inventor 2014 Certified Professional
Autodesk AutoCAD 2013 Certified Professional
Certified SolidWorks Professional
Inventor Professional 2015 64-bit
http://www.autodesk.com/edcommunity
http://home.pct.edu/~jmather/content/DSG322/inventor_surface_tutorials.htm
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JDMather
Posts: 26,246
Registered: ‎04-20-2006
Message 17 of 38 (206 Views)

Re: assembly constraints and other Qs

10-06-2013 10:22 AM in reply to: JDMather

At your level of experience you should probably NOT be creating sketches at the assembly level.  (see attached image)

And probably not axis or workplanes.

 

If you want to define the locations of the tires/wheels relative to the frame, then create a sketch in the Main traingle.ipt file that you can then use in the assembly to constrain the tyre and rim.ipt.

 

I recommend that you start investigating multi-body solids (master modeling) techniques were you model all of the parts in a single part file (probably want to investigate Sketch Blocks as well - since you have relative motion) and then push out the individual parts and assembly when completed (or nearly completed).

 

I will try to post an example tomorrow if I get a chance.  In the meantime - you should concentrate on getting correct fully defined sketches.

 

For the 35t chainring - do you want a true sprocket?  If so - I can walk you through an interesting proceedure that will give you a rock-solid understanding of parametric constraints and dimensions.

Please mark this response as "Accept as Solution" if it answers your question.
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Autodesk Inventor 2014 Certified Professional
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Certified SolidWorks Professional
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Active Contributor
oneloosecrank
Posts: 26
Registered: ‎08-30-2013
Message 18 of 38 (180 Views)

Re: assembly constraints and other Qs

10-07-2013 09:54 AM in reply to: oneloosecrank

JDMather: 

In order for me to manufacture something out on the shop floor - it should be fully defined.

So why shouldn't the designer do this work before sending to manufacturing?

 

I agree, the designer should be creating designs fully useable by the manufacturer. Do you mean that, the sketch I've created isn't fully defined, and by this, the nodes aren't properly intersecting so it's just a birds nest of lines? I've noticed that sometimes when I'm placing lines they aren't connecting properly. I'll have to be careful with that.

 

JDMather:

For the 35t chainring - do you want a true sprocket?  If so - I can walk you through an interesting proceedure that will give you a rock-solid understanding of parametric constraints and dimensions.

 

Thanks, but the chainring is only there as a dimensional tool. The aim of this project is to create the yoke which you have used in your attached image. It has to connect to the lower linkages and spread around the tyre without contacting the chainring. Everything else is merely there for my own learning or to dimension the yoke. My short term goal is to have the lower linkages and the yoke CNCed to build a new rear end for a test mule. My long term aims are to understand Inventor enough to be able to CAD from the groud up my own prototype frame (twhich has already been designed). The future prototype depends on the success of the suspension kinematics of this test mule. Unfortunarely, it's the yoke is the one darn thing I can't get right at the moment! I'll go back through your post and seek out tutorials and further learning on the areas you have mentioned, in the meantime, have you any ideas why when I try to extrude that part (see attached) I can only make a cut, and not a solid?

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JDMather
Posts: 26,246
Registered: ‎04-20-2006
Message 19 of 38 (176 Views)

Re: assembly constraints and other Qs

10-07-2013 10:05 AM in reply to: oneloosecrank

oneloosecrank wrote:
..I can only make a cut, and not a solid?

Walk out to the shop floor (figuratively - in your mind).

You have an assembly before you.  You can only cut existing parts.  You cannot magically add material.

 

Your sketch is at the assembly level - therefore it will only allow you to cut.

 

You need to create parts at the part level.

 

For your design - the easiest way to do this would be multi-body solids techniques.

 

Are you willing to start this one over from scratch?
Right from the beginning?

If so, I can walk you through how I would do the design.

Please mark this response as "Accept as Solution" if it answers your question.
-----------------------------------------------------------------------------------------
Autodesk Inventor 2014 Certified Professional
Autodesk AutoCAD 2013 Certified Professional
Certified SolidWorks Professional
Inventor Professional 2015 64-bit
http://www.autodesk.com/edcommunity
http://home.pct.edu/~jmather/content/DSG322/inventor_surface_tutorials.htm
Active Contributor
oneloosecrank
Posts: 26
Registered: ‎08-30-2013
Message 20 of 38 (165 Views)

Re: assembly constraints and other Qs

10-07-2013 10:18 AM in reply to: JDMather

I see, if you are unable to add material in assembly then that explains a few things. I assumed that a new sketch would just start a new part - I did wonder why no new file was being created to go with that part...

 

And yes, I'm very willing to start over. There's a few dimensional short comings that I want to re-do as well. Advice on how better to approach project this is extremely welcome :smileyhappy:

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