How to get a box corner rounded ?

[POPRivet]

Hello Everyone !

 

First of all let me give you my congratulations for the great work you develop here !

 

This is my first post, and I arrived here because I was searching the Internet for a solution to a problem about modelling a solid in AutoCAD 2008, and I found this site with fantastic tips and tutorials for people like me.

 

I am a " good enough " user of AutoCAD in 2D ( at least for what I need ) but almost a beginner at 3D modelling.

 

My problem is...

 

I can't get a cube corner rounded.

The portion of the corner that is to be subtracted from the box is defined by three arcs, each one at a different face, you can see more clearly what I mean if you see the attached file:

 

BOX_ROUNDED_CORNER.dwg

 

 

I would appreciate very much any suggestions or solutions to this problem, I use AutoCAD 2008.

 

Thank You Very Much for your time and attention !!!

BOX_ROUNDED_CORNER.dwg

[MSasu]

Are those arcs of different radiuses?

[Dadgad]

Welcome to the forum.

 

A couple of ways to go.

One would be to draw the TOP view including the radii on the corners in the XY plane.

Using the PRESSPULL command pull it up the Z axis to give it depth and transform it into a 3D solid, which already has four radiused edges.

 

Watch the EXTRUDE & PRESSPULL video tutorial on this site (http://www.cadtutor.net/tutorials/autocad/extrude-and-press-pull/) for clarification.

Pay extra attention to the PRESSPULL command as it is much more powerful and faster than the EXTRUDE command.

 

Then you can use the FILLETEDGE command to put the radii on the top and bottom corners of your 3D solid. :wink:

 

In order to better see what is going on in modelspace when you are modeling I would suggest that you use an ISOMETRIC

perspective chosen from your VIEWS toolbar.

Look at the commandline history I have attached in the image of the box which now has radiused edges with radius of 3, all the way around.

I didn't PRESSPULL this one from scratch as described above, just slapped some radii on the edges of your existing box.

Edited July 18, 2012 by Dadgad

[hoss]

If you look carefully you see all arces have different radiuces, front one 22.8454, top one 45.647, and side one is 35.486

not sure if its a mistake , or they are ment to be different, specially on top and side

[Dadgad]

If you look carefully you see all arces have different radiuces, front one 22.8454, top one 45.647, and side one is 35.486

not sure if its a mistake , or they are ment to be different, specially on top and side

 

Yes, right you & Mircea are, they are quite different.

I took this to be a rather entry level question about filleting, may be wrong.

The rectangular block is called a cube, and the arcs are not all tangential too, which seems a bit counter intuitive.

I was hoping to hear back from POPRivet with some feedback, we'll see what the verdict is when we do.

[JD Mather]

The rectangular block is called a cube, and the arcs are not all tangential

 

A cube has equal sides.

I didn't check all of the arcs for tangency - but at least one of them is wayyyyy off.

I suspect this was not the design intent and due to inexperience.

 

The solution is Loft surface and then Slice with surface.

Oops, loft won't work with this in AutoCAD.

Let me see how a boundary Patch is made in AutoCAD.

Back in a minute.

 

OK, looks like Patch will only work with surfaces in AutoCAD.

Explode the box into surfaces.

Trim the surfaces with the arcs (will need to fix these).

Create the Patch surface.

Sculpt

or something along these lines (I didn't finish the problem as it is so much easier in Inventor, but I'm sure I could get it in AutoCAD if motivated).

[POPRivet]

Dear Sirs

 

Thank you very much for your answers, I feel they are getting me in the right direction to the solution.

 

Unfortunately I wasn't clear about what I was asking, but now I am attaching a picture which shows what I'm trying to model.

 

The drawing file I sent in my first post was just an example, and yes, all three arcs have different radii, they are not tangential to the faces edges because... it was my mistake...

 

I want to model an watch case bracelet horn like the one shown in the picture below, is it possible with AutoCAD 2008 ?

 

 

 

Once again Thank You Very much for your time and patience !

 

Best Regards

[SLW210]

I would use LOFT.

[Dadgad]

Dear Sirs

 

Thank you very much for your answers, I feel they are getting me in the right direction to the solution.

 

Unfortunately I wasn't clear about what I was asking, but now I am attaching a picture which shows what I'm trying to model.

 

The drawing file I sent in my first post was just an example, and yes, all three arcs have different radii, they are not tangential to the faces edges because... it was my mistake...

 

I want to model an watch case bracelet horn like the one shown in the picture below, is it possible with AutoCAD 2008 ?

 

[ATTACH=CONFIG]36017[/ATTACH]

 

 

Once again Thank You Very much for your time and patience !

 

Best Regards

 

Well that certainly explains it a bit better.

Nice picture, and watch.

I am sure that it can be done with recent versions

and suspect that it can be done with 2008 also, though I am sure it will

be more difficult than with some MODERN software.

INVENTOR anyone?

Still I will be interested to see what is the best solution for the swooping chamfer

along that one edge, the rest of it is a slam dunk.

Slice with a surface perhaps?

OK all you surface meisters let's see what you come up with.

It needs to be pretty!

[Dadgad]

I would use LOFT.

 

Yeah that's what I thought too, tried that first,

but I wound up using PRESSPULL, SLICE (surface option) & FILLETEDGE.

Lots of room for improvement, but the basic concept holds water.

Edited July 19, 2012 by Dadgad

[SLW210]

Where is the CHROME?

[POPRivet]

Dear Mr Dadgad and Mr SLW210

 

Thank you for sharing your ideas, especially to Mr Dadgad that even took the time to model a watch case !

 

I have been experimenting with your ideas and have achieved partial success.

 

I successfully used LOFT to produce the bevelled corner, it was interesting to see that the results vary with the order by each arc is chosen.

 

The results obtained by Mr Dadgad with the PRESSPULL command are very encouraging.

 

I tried to use PRESSPULL, but after the modification of the original solid by enlargement of the area defined by the three arcs, I could not remove it from the original solid box.

It wasn't possible to subtract the new " presspulled " solid nor select the interface surface between the " presspuled "solid and the original box to use it as a slicing plane to achieve the bevelling.

 

I am attaching a drawing file showing what I am trying to say, maybe you can give me some hints about what I'm doing wrong.

PRESSPULL.DWG

Thank You Very Much for your help and keep spreading your wisdom, I'm sure thousands of persons around the world are absorbing it every day with great satisfaction.

 

Best regards

[Dadgad]

Dear Mr Dadgad and Mr SLW210

 

Thank you for sharing your ideas, especially to Mr Dadgad that even took the time to model a watch case !

 

I have been experimenting with your ideas and have achieved partial success.

 

I successfully used LOFT to produce the bevelled corner, it was interesting to see that the results vary with the order by each arc is chosen.

 

The results obtained by Mr Dadgad with the PRESSPULL command are very encouraging.

 

I tried to use PRESSPULL, but after the modification of the original solid by enlargement of the area defined by the three arcs, I could not remove it from the original solid box.

It wasn't possible to subtract the new " presspulled " solid nor select the interface surface between the " presspuled "solid and the original box to use it as a slicing plane to achieve the bevelling.

 

I am attaching a drawing file showing what I am trying to say, maybe you can give me some hints about what I'm doing wrong.

[ATTACH]36047[/ATTACH]

Thank You Very Much for your help and keep spreading your wisdom, I'm sure thousands of persons around the world are absorbing it every day with great satisfaction.

 

Best regards

 

Playing around with this will probably help you understand how I did what I did.

I drew the shape of the watch in TOP view, then used PRESSPULL to give it depth along the Z axis.

I then defined the area where the bezel has that nice chamfer and created a SURFACE.

I then used the SLICE command and selected the SURFACE option so that I could use that SURFACE to cut off the little bits which are pulled out to the sides.

You will also see the surfaces which I used in the SLICE operation between the cut off pieces and the bezel.

Then I used the FILLETEDGES command.

You will see 2 different details where the strap horns meet the bezel, I prefer the left hand one, as the additional inside radius cheapens the rest of the watches subtle design (not mine, but the one in your picture).

It is very late where I live, and am going to hit the hay now.

I hope this will help you a bit. It can be done, but it is pretty demanding and I should think reasonably daunting for an early modeling study.

Good luck with it, I look forward to seeing and hearing how you do with it.

I would suggest you use the MODELING, SOLID EDITING, DRAW & MODIFY toolbars while working with this.

 

If I knew anything about working with SURFACES and MESHES I might have done this a different way.

There are lots of great tools for working in those mediums too.

Bezel 3.dwg