Creation sketch with VBA iLogic

[jeeva.scientist]

1) Creating a sketch with construction lines. The parameters are "circle_small" , "circle_large" and "c2c".
sketch creation with Hidden lines

 2) Now chords are drawn by using the previous sketch as the path. In the end, there will be a gap which is to be filled with the same chord. now the "c2c" dimension can be converted into a driven dimension.

chord drawin with certain dimension along the path of the sketch

 3) The gap in the previous sketch is filled with a chord by converting the "c2c" as driven dimension.

gap in the previous sketch is filled with the same chord length by changing the "c2c" as driven dimension

how to create this using iLogic VBA?

Input Dimension

circle_small

circle_large

c2c

chord

Changes

c2c can be converted into the driven dimension to adjust the gap.

Can anyone help me with the program?

I have attached my part file.

kindly find the attachments, thanks.

Inventor Version 2020

[jeeva.scientist · Accepted solution]

I have attached the Working part for future reference. I used the numerical method to solve the problem.

But Still, I want to assemble a chain with two different links this will only be possible if we could create a sketch-like this,

kindly take a look at the working model of fully parametric bucket assembly.

if anyone have any suggestion please let me know, thanks for your time. 

Attachment detail: Autodesk Inventor 2015

[Sergio.D.Suárez]

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@jeeva.scientist  ha escrito:

Hello Mr.Serigo,

Thanks for your response, I have considered your suggestion of using "linear and circular pattern". There is no issue in using the "linear pattern" but, when we use "circular pattern" while giving the distance between two instances, which in our case is the pitch. In a "circular pattern", the pitch distance is considered as an arc length, not as a chord length. so the chain link will interfere with one another it will not be accurate.

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Hi, what you said is a mistake. In a circular pattern the separation between instances is carried out through a total angle and a number of instances, you have the length of the circular rope, which in this case is your pitch, also has the radius of the circle, then you can create a triangle with the two radial lines and with the
circular rope Now you will get the searched angle by instance. Since you have an arc for your chain, you can place a reference dimension that measures your total angle inscribed in your arc. Now you must calculate how many circular instances enter this arc, dividing this total angle by the angle of the instance, this number will be decimal, you must round it down to get an integer. Then you will multiply this number of instances by your instance angle to get the real total angle encompassed by the n instances.
It is an arduous process, but it will provide the solution to your problem.
 If you can access any machine with Inventor 2018, take a look at the file that I have attached above, I think it could be very useful. Regards

[Sergio.D.Suárez]

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@jeeva.scientist  ha escrito:

Hello Mr.Serigo,

Thanks for your response, I have considered your suggestion of using "linear and circular pattern". There is no issue in using the "linear pattern" but, when we use "circular pattern" while giving the distance between two instances, which in our case is the pitch. In a "circular pattern", the pitch distance is considered as an arc length, not as a chord length. so the chain link will interfere with one another it will not be accurate.

How can I solve that problem?

I’m eager to receive your feedback, thanks.

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Hi, what you said is a mistake. In a circular pattern the separation between instances is carried out through a total angle and a number of instances, you have the length of the circular rope, which in this case is your pitch, also has the radius of the circle, then you can create a triangle with the two radial lines and with the
circular rope Now you will get the searched angle by instance. Since you have an arc for your chain, you can place a reference dimension that measures your total angle inscribed in your arc. Now you must calculate how many circular instances enter this arc, dividing this total angle by the angle of the instance, this number will be decimal, you must round it down to get an integer. Then you will multiply this number of instances by your instance angle to get the real total angle encompassed by the n instances.
It is an arduous process, but it will provide the solution to your problem.
 If you can access any machine with Inventor 2018, take a look at the file that I have attached above, I think it could be very useful. Regards

[jeeva.scientist]

There is no attachment. could you attach it again please, thanks?

[Darkforce_the_ilogic_guy]

is it possible to see the souce code that you made ? want to leard how you did that ?.. and I want to leard form other people code 🙂 

[HermJan.Otterman]

Hi,

in message 20 I posted a part.

in it is a sketch and some iLogic code.

does that help you?

[Darkforce_the_ilogic_guy]

well no.. because when I try to open it .. it does not open but create a new file.... and I can´t find the ilogic code in this new file. so can´t see your code

[Sergio.D.Suárez]

In some older comments on this thread, I shared a version of the chain project. This is the oldest version file I have found. I think it's version 2017.

It is from my beginnings in inventor, surely there will be many improvements to make it, just take an idea of the project.
I hope it gives you some way to the solution. Regards