topic Frame using sketch with equations in Inventor Forum

Frame using sketch with equations

Anonymous — Tue, 15 May 2018 20:45:43 GMT

I have created a sketch to drive my frame geometry. I have equations that compute the number of HSS members that shall be placed. These equations determine the number of lines, these lines drive the frame. When I change the length of my structure, it automatically changes the number of HSS members needed. How can I make the frame regenerate according to the proper amount of lines?

Thanks

Alex

Inventor 2019

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Re: Frame using sketch with equations

johnsonshiue — Wed, 16 May 2018 00:59:29 GMT

Hi! This one is tricky. If I understood how Frame Gen works correctly, I don't think it is currently doable at the moment. The issue here is that Frame members are driven by skeletal part (which is driven by sketches and edges). Now you are trying to use equations to drive the members. Then you will run into multiple-driver issue. I don't think it is doable at the moment.

Do you mind elaborating the need to use an equation to drive the frame?

Many thanks!

Re: Frame using sketch with equations

doug.johnston — Wed, 16 May 2018 06:38:39 GMT

I going to take a guess that the HSS members need to be suppressed/unsupressed based on the length of the frame and the member spacing (driven by an equation) ???

If you can post a picture or your model, it would help clarify your request ....

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Re: Frame using sketch with equations

Anonymous — Thu, 17 May 2018 20:09:53 GMT

The overall length varies and the HSS members need to be at a specific spacing using equations we have established. I attach a picture of what I am talking about. The HSS cross members and HSS braces on the sidewall are centered with each other using sketches. These sketches are patterned with the number are occurrences and spacing given as equations. The spacing is roughly 5' with an offset of 2'-6" from the front edge. Therefore for a 20' structure, we should have 4 cross members/braces, 3 cross members/braces for 15', 5 cross members/braces for 25', etc. How can I make these automatically populate the part with the correct number of bracing for the structure?

kelly.young has embedded your image for clarity.

Re: Frame using sketch with equations

Frederick_Law — Wed, 16 May 2018 13:35:21 GMT

You need to use pattern for that repeating HSS.

Re: Frame using sketch with equations

kelly.young — Thu, 17 May 2018 21:00:12 GMT

@Anonymous I don't know if using Frame Generator to add the members would work best as you would have to pattern the lines and then select them automatically, I don't know if that is possible or would require complex iLogic.

Collection of iLogic Models For Beginners

An easier way would be to make the outside frame with the generator, and make one member for the support that will then be patterned based on some sort of rule/dimensional equation related to the frame size.

Here is a similar thread that has lots of great links:

Set number of parts as parameter and make assembly automatic

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