How to draw small L shaped ribs in this model.

[hemal]

I tried a lot. But I could not succeed to draw L shaped ribs shown in the model. I drew  big solid and L shaped rib. Then did union. But could not fillet later. I also tried fillet first. But could not subtract Lshaped rib from the big solid. Kindly help me.

 

[CyberAngel]

Have you tried to create the lower surface first, then add an array of rib objects across it?

[ReMark]

Every now and then a question such as this comes up that makes me wish I still had access to full AutoCAD... but I don't anymore.  One option would be to create the bulk of the object in a 3D solid.  As for the ribs I would create, off to one side, the side profile of one rib and extrude it.  I would move this to the location of the first rib then create the remaining ribs using the 3D Array command.  Finally, I would subtract all the ribs from the main body.  That should give you the desired result you are looking for.

[zaphod]

here is a possible method.

Ribs-Slots.dwg

[hemal]

On 4/29/2026 at 11:21 PM, zaphod said:

here is a possible method.

Ribs-Slots.dwg 216.4 kB · 1 download

On 4/29/2026 at 11:21 PM, zaphod said:

here is a possible method.

Ribs-Slots.dwg 216.4 kB · 1 download

Hello, You have done great job.can you describe the procedure how y

ou did this? It would be great help for me. Because I am unable to open the drawing as I have older version of ઑટોકેસ.

 

[hemal]

1 minute ago, hemal said:

 

I have older version of autocad. I can"t open your file. Please describe the procedure. How did you draw it? Thanks.

[SLW210]

10 minutes ago, hemal said:

I have older version of autocad. I can"t open your file. Please describe the procedure. How did you draw it? Thanks.

Download the FREE Autodesk DWG TrueView | DWG Viewer.

 

Then you can convert newer version .dwg to older version yourself.

[lrm]

Here's one method similar to @hemal

both side

1. Use section to create the green section cut as shown below.
2. Set the UCS to the plane of the setion.
3. Offset to both sides of the section and trim shape. Note, offsetting to both sides ensures that the resulting solids will penetrate the surface and not be just flush with it.
4. Convert to polyline.
5. Extrude.

 

   6. Array

  7. Subtract.

[hemal]

Thank you @irm.Your method works perfrctly fine. I did it accordingly, and perfectly done. Once again Thank you very much.