topic Re: Parameter driven sketch in Inventor Forum

Parameter driven sketch

edgars8VUKG — Sat, 24 Dec 2022 14:51:43 GMT

Hi Everyone!

I am trying to make parameter driven sketch for music instrument.

What I control via parameters is string count, spacing between them in middle and at the end.

I want to place a points on blue line in order to be on line with two other points. Point placement depends on string count. Spacing on blue line between points are not equal. String count needs to be changeable . So Question is how to place point on blue line depending on string count and they need to be on the line?

Re: Parameter driven sketch

Alexander_Chernikov — Sat, 24 Dec 2022 18:25:05 GMT

Hi, if possible, attach a part file with a parametric sketch

Re: Parameter driven sketch

johnsonshiue — Wed, 04 Jan 2023 22:44:11 GMT

Hi! This might be a bit tricky to do in a sketch (still doable using sketch pattern). But, I would create a work point and create a rectangular pattern of the point. Use parameter expression to drive the number of points.

Many thanks!

Re: Parameter driven sketch

kacper.suchomski — Fri, 13 Jan 2023 01:30:04 GMT

Hi @edgars8VUKG

Here's how to break a line segment into points using a sketch pattern:

(view in My Videos)

If you don't have a dimension for this line segment, you can either create one or create a driven (read only) dimension.
In addition, the number of points can be controlled using user parameters (and more advanced - through the configurator), so as not to search for these parameters in the list or in operations every time.

I also created a cental point to show you an important thing - as the number of points changes, Inventor does not remember their character.

That means you can easily change it manually.
But if you also want to automate further modeling operations (based on this pattern) so that the model construction updates, you will have to use more complex methods and tools like iCopy or iLogc.

Does this answer your question?

Re: Parameter driven sketch

kacper.suchomski — Mon, 16 Jan 2023 23:38:03 GMT

Hi @edgars8VUKG

Did you manage to solve the problem?

Re: Parameter driven sketch

edgars8VUKG — Tue, 17 Jan 2023 06:04:48 GMT

Thank you for your all time. The proposed solutions do not work for my situation because of unequal point displacement. The proposed solutions gave me an Idea that each point separately must be placed on model as individual features. One unified sketch controlling mechanism is not suitable for this situation. I have planned that using model states I can control which points are actives ones. Since this is for my hobby project it will took some time to show some results in here. Thank You all again!

Re: Parameter driven sketch

kacper.suchomski — Tue, 17 Jan 2023 11:32:39 GMT

You can also read this material:

https://www.youtube.com/watch?v=BBVTb1ucqZ4

In fact, why shouldn't the spacing be equal?

Re: Parameter driven sketch

edgars8VUKG — Tue, 17 Jan 2023 12:11:03 GMT

Cant Be equal spacing because spacing marked re areas must be equal like other music instruments, but in this case strings are not parallel but with equal angle between them. If spacing is un equal then it is not comfortable to play it. That's why it is Super difficult to determine spacing between marked rec circle points. I want to make this model as tool for searching good and ergonomic designs for traditional music instrument. I have made abut twelve model types in 2d cad (not parametric) for searching good design. One thing is ergonomic and design buts most super important thing is physics which is applied to instrument. every string thickness ,frequency, forces is calculated and those determent precise string lengths.

Re: Parameter driven sketch

kacper.suchomski — Tue, 17 Jan 2023 12:17:42 GMT

I understand that the points on the yellow are evenly spaced.

What is the blue line for?

Re: Parameter driven sketch

edgars8VUKG — Tue, 17 Jan 2023 12:36:53 GMT

That line were for easier equal spacing purposes. That line is perpendicular to longest line and I can control angle between blue line and line with pacing points. This is made in this way because of players playing hand placement on instruments.