Help with creating Corbel

[Anonymous]

Hi,

I'm detailing a historic building which a corbel around the gable end.

I've tried it with OBJECTiVE but can't get the profile to look accurate enough, and it looks messy where each point joins together (mainly at the ridge)

I've attached a image from google street view as a reference to what I want to achieve (sorry it's not very clear)

Thank You

Image

[JaredBanks]

Other than waiting for the shell tool in the student version of 15...

You could draw this with complex profile walls in plan, save it as an object (look at the proper elevation in 3D so that it saves standing up, look around the forum for how to do that), place the object in plan, use it as an operator to cut the walls below. Probably the easiest solution.

I feel like a combination of complex profile beams and columns should work. But it'll involves some tricky operators.

You could also build the gable out of little roofs.

[Rick Thompson]

The Shell tool would not really help, or take forever:) There are rafter objects you can gain up and set at a slope, so that might be the quickest. They should join cleanly. Outside of that Smartparts has some sloping objects I use for rake trim, but you have to pay for that library. I can't really tell from the picture as it is very fuzzy. The nice thing about the Smartparts object is that you can set the ends to miter as needed.

[Ralph Wessel]

NStocks wrote:
I'm detailing a historic building which a corbel around the gable end. I've tried it with OBJECTiVE but can't get the profile to look accurate enough, and it looks messy where each point joins together (mainly at the ridge)

You should be able to create perfect junctions with OBJECTiVE without much fuss. I'll show you how would approach the problem, although it might be more complex than it seems. Referring to the attached image:

• 1. Create your profile object (with OBJECTiVE > Component > New Profile and set out the profile around the perimeter of the gable end. You can draw these directly into an elevation view if you wish (or draw them in the floor plan and tilt them up afterward with OBJECTiVE > Tools > Rotate). Draw the ends deliberately overlapped.
  
  2. Use OBJECTiVE > Tools > Split to cut the profiles where they meet. If you do this in elevation, you can snap to the profile intersection for very accurate cutting. Delete the offcuts.
  
  3. The result in 3D - all the junctions are perfect.
  
  4. You can also trim the walls under the profiles (SEO).
  
  5. An example of a model of a historic building where this technique has been extensively used.

Perhaps you could illustrate what happens when you try this? It should be very quick and easy.

[Anonymous]

Hi Ralph, thanks for your reply.

Perhaps I couldn't get the results I desired using OBJECTiVE because I tried to create the whole corbel as one piece! Your method looks much more convincing.

On a side note, referring to the attached, does the corbel simple 'sit' directly on top of the gable end, much like say architrave does on a wall? Also, if you still have the file open, could you post a screenshot of the profile for me?

Thank you very much for your help.

Image 2

[Ralph Wessel]

NStocks wrote:
On a side note, referring to the attached, does the corbel simple 'sit' directly on top of the gable end, much like say architrave does on a wall? Also, if you still have the file open, could you post a screenshot of the profile for me?

I think these elements function as a coping stone (to protect the top of the wall from the weather at the gable end) and, as such, they would sit directly on the top of the wall. I don't think the profile I drew would be much help - I just quickly mocked something up that looked roughly like the image, but the source photo was too course to interpret the coping profile correctly.