topic Re: Creating a Rib Question in Inventor Forum

Creating a Rib Question

PCAPUTO85 — Wed, 16 Oct 2019 18:43:15 GMT

I am trying to create a rib part I am working and I am having diffuctly creating a rib or feature that is flush with a domed surface.

Re: Creating a Rib Question

JDMather — Wed, 16 Oct 2019 19:58:21 GMT

zip (not rar) your *.ipt file and Attach it here.

Re: Creating a Rib Question

TheCADWhisperer — Wed, 16 Oct 2019 21:08:49 GMT

Going out to the very edge of the base cylinder would not make logical sense since the edge is circular while the top of the rib is planar and the bottom edge of the rib is a line, not an arc. And at the intersection with the spherical surface it would not make logical sense for it to be a line.

Once you have Attached your attempt - I can post my solution.

Re: Creating a Rib Question

IgorMir — Thu, 17 Oct 2019 02:00:51 GMT

Here is a quick version of it. But I wasn't using Rib tool for it. In this particular model it seems not working. Frankly - Rib tool has a mind of his own from the day it was conceived. Hence - the old fashion technique comes to the rescue every now and than. The attached file is in IV2020 format.

Cheers,

Igor.

@PCAPUTO85 wrote:

I am trying to create a rib part I am working and I am having diffuctly creating a rib or feature that is flush with a domed surface.

Re: Creating a Rib Question

PCAPUTO85 — Thu, 17 Oct 2019 11:28:36 GMT

I attached the file for you to look at.

Re: Creating a Rib Question

PCAPUTO85 — Thu, 17 Oct 2019 11:29:36 GMT

Thank you

Re: Creating a Rib Question

PCAPUTO85 — Thu, 17 Oct 2019 11:30:33 GMT

Here is my file

Re: Creating a Rib Question

TheCADWhisperer — Thu, 17 Oct 2019 11:36:48 GMT

Your sketches are not fully defined (especially Sketch1) and you have extraneous dimensions that are not on the original drawing (see Attached file).

Re: Creating a Rib Question

PCAPUTO85 — Thu, 17 Oct 2019 12:33:44 GMT

The drawing was missing some of the dimensions, that why some were filled in. I am still not understanding how you go the rib feature to be flush with the domed surface when I extrude it, it goes straight out, while on your it curves around.

Thanks you all your help

Re: Creating a Rib Question

JDMather — Thu, 17 Oct 2019 13:26:44 GMT

@PCAPUTO85 wrote:

The drawing was missing some of the dimensions...

The drawing was poorly done, but no missing dimensions.

You should be able to drag the red End of Part marker up to the top of the history tree and then drag it down step-by-step to reproduce the steps.

Can you ask your instructor to join this discussion?

Re: Creating a Rib Question

PCAPUTO85 — Thu, 17 Oct 2019 14:07:38 GMT

The drawing is from am old mechanical drawing textbook. Sorry for the confusion, but I am the instructor. I teach high schoolers and I am learning the program myself. I will take a look again. Thank again for your help.

Re: Creating a Rib Question

JDMather — Thu, 17 Oct 2019 14:57:55 GMT

I have been teaching for more than 25 years, so I recognized the problem.

One thing about these old textbook problems that preceded 3D CAD is that the images were done by hand on drawing board and liberties are taken with the hand-drawn geometry that is not physically possible in the real world.

If you have trouble following the steps - post back and I will create a video for this problem.

Re: Creating a Rib Question

PCAPUTO85 — Thu, 17 Oct 2019 15:57:50 GMT

That would be great and most appreciated.

Re: Creating a Rib Question

IgorMir — Thu, 17 Oct 2019 22:17:02 GMT

Hi;

Do you think that's the appropriate representation of the rib?

Cheers,

Igor.

@TheCADWhisperer wrote:

Your sketches are not fully defined (especially Sketch1) and you have extraneous dimensions that are not on the original drawing (see Attached file).

Re: Creating a Rib Question

TheCADWhisperer — Thu, 17 Oct 2019 22:21:44 GMT

Drag the EOP to the end and capture the same two images.

Re: Creating a Rib Question

IgorMir — Thu, 17 Oct 2019 22:32:59 GMT

Thanks, my bad. I was indeed looking at the rib itself and got the EOP up. But than again - the upper surface of the rib is rounded now. It is hard to tell if it is a design intent or not. But since it is just an exercise - it might do.

Cheers,

Igor.

@TheCADWhisperer wrote:

Drag the EOP to the end and capture the same two images.

Re: Creating a Rib Question

TheCADWhisperer — Thu, 17 Oct 2019 23:04:10 GMT

If modeled flat - other assumptions have to be made.