topic Re: Creation algorithm using the frame generator in Inventor Forum

Creation algorithm using the frame generator

89198826955 — Thu, 12 Jan 2023 11:51:11 GMT

Good afternoon! I constantly encounter unusual work of the frame generator. Maybe I'm doing it wrong? And I have some questions

1. If I make an array, then I do not have the ability to change the profile using the frame generator.

2. even if I put three dependencies and the part is fully defined, the array of these parts is not fully defined

3. subject to the correct arrangement of parts, the change leads to unpredictable actions and the destruction of the connection. In the nested assembly file I put an example it has a variable parameter "height". if I change it to the big side it is rebuilt well, if the structure collapses to the small side. After reading the forum, I saw many different answers to these questions, but did not understand the "correct" construction technology. The question is how to build it most "correctly"? For example:

1. it is correct to make an array at the sketch level or vice versa to make an array at the detail level.

2 I saw this method: make micro-holes and make dependencies with them, and suppress them when printing a part As an answer, I would like to receive an algorithm for the correct solution.

Re: Creation algorithm using the frame generator

johnsonshiue — Tue, 10 Jan 2023 22:30:09 GMT

Hi! Are you talking about the alignment? The frame members may rotate around the reference sketch in 3D, leading to unpredictable behavior. To ensure proper alignment, right-click on each member -> Align -> select a piece of static planar or axial geometry in the assembly.

Many thanks!

Re: Creation algorithm using the frame generator

89198826955 — Tue, 10 Jan 2023 23:38:45 GMT

It's here?

Did I understand correctly?

Re: Creation algorithm using the frame generator

89198826955 — Wed, 11 Jan 2023 19:34:34 GMT

one element is fully defined (black dot)

array of elements not fully defined (white dot)

now if I attach a corner to the plane of the part using the frame generator, then the behavior will be unpredictable

because the part plane is not fully defined

Question: how to do it right? what algorithm?

abandon the array and arrange all the elements manually?

add dependencies to each element of the array separately?

or is there another option?

Re: Creation algorithm using the frame generator

89198826955 — Wed, 11 Jan 2023 21:04:43 GMT

If you make a dependency for array elements

there is an excessive dependency

Re: Creation algorithm using the frame generator

cadman777 — Wed, 11 Jan 2023 22:05:37 GMT

For your simple structure, I would NOT use FrameGenerator.

Instead, I would make a MasterSketch and Derive it into each part.

Then insert each part into the assembly/weldment at the WorldOrigin and make them Grounded.

Then array the parts in the assembly as desired.

When using FrameGenerator, I rarely use arrays of parts.
Mostly I do it on railing pickets b/c they are so repetitive, and sometimes on railing posts when the railing weldment is a long run with many pickets on the same ground level.

Short story: Once I had to design a drilling rig (it's a 100' high tower with trusses on 3 sides and open on one side). I tried making it in the FrameGenerator and it BOMBED! In other words, the FrameGenerator model sucked up computing resources so it slowed down the whole project. That was my lesson in NEVER USE FG TO DO COMPLEX WELDMENTS! So from that point on (that was in the early 2000's) I make simple and complex weldments with a MasterSketch which is derived into the part, and use a Block of the structural profile inside each part. Then make end treatments using WorkFeatures based on the MasterSketch. There's a LOT of flexibility when using BASIC Inventor.

So if I was making that simple frame (looks like 5 or six 'custom' parts instead of 17+ parts using FG), I would NOT us the FG.

Re: Creation algorithm using the frame generator

johnsonshiue — Thu, 12 Jan 2023 02:04:12 GMT

Hi! Yes, that is the Align command I was talking about.

Many thanks!

Re: Creation algorithm using the frame generator

89198826955 — Thu, 12 Jan 2023 06:38:57 GMT

So the best solution would be to abandon the frame generator and create a multi-body part?

Create a frame profile --- autocad blocks -- or draw it yourself?

Re: Creation algorithm using the frame generator

89198826955 — Thu, 12 Jan 2023 21:21:51 GMT

Really want to get a build file using a frame generator from professionals to analyze the build

Re: Creation algorithm using the frame generator

cadman777 — Thu, 12 Jan 2023 22:03:17 GMT

OK, I get it. So you want to do the FrameAnalysis, that's why you're using the FG.

I think you can make it yourself and use FEA Analysis on it.

Let me take time tomorrow to throw one together for an example for you to see what I mean.

Re: Creation algorithm using the frame generator

89198826955 — Thu, 12 Jan 2023 22:11:05 GMT

No, not for frame analysis

to analyze the construction method

Re: Creation algorithm using the frame generator

89198826955 — Thu, 12 Jan 2023 22:26:58 GMT

The construction algorithm is necessary for me for training

b.mccarthy showed me the algorithm for building from sheet metal

Now building this takes 15 minutes)))

Re: Creation algorithm using the frame generator

89198826955 — Thu, 12 Jan 2023 23:54:12 GMT

On the advice of Johnson Shiue, I completely defined the part (black dot) and snapped the angle to the plane of the part

everything works great

when changing the height of the structure, the assembly behaves correctly

if i add an array of details

details not fully defined (white dot)

and assembly behaves misbehaves

when i change the height of the structure only the first part is always in the right position