topic Re: Angle an entire disk 15 degrees to the center in AutoCAD Forum

Angle an entire disk 15 degrees to the center

Anonymous — Tue, 21 Sep 2021 23:45:03 GMT

I've gotten to this point, but now I need to angle this entire face towards a specific point, by 15 degrees. My idea in my head is like shifting it to a line of a cone, but I wouldn't know how to go about doing that. Any suggestions?

I'll include the dwg file.

Re: Angle an entire disk 15 degrees to the center

leeminardi — Wed, 22 Sep 2021 01:34:28 GMT

Its not clear what you want to rotate not about what axis.

Create a line that defines the axis you want to use. For example, if you want to rotate the shape by an angle about a line parallel to the Y axis passing through the center then create a line in the Y direction. Use the rotate3d command (not 3drotate) and specify the Y axis and then any point on the axis line. Input the desired angle.

If the axis for the rotation is not parallel to one of the principal axes then used the 2 point option of rotate3d to define the axis.

Re: Angle an entire disk 15 degrees to the center

Patchy — Wed, 22 Sep 2021 02:29:49 GMT

Do you want to bevel that surface 15 degrees?

Re: Angle an entire disk 15 degrees to the center

Anonymous — Wed, 22 Sep 2021 05:05:31 GMT

Yes, that's more what I meant...but will beveling it keep the indents I have on the shape?

Re: Angle an entire disk 15 degrees to the center

Patchy — Wed, 22 Sep 2021 12:59:44 GMT

I can't open it with my Autocad.

No, it doesn't look like it's deep enough.

Re: Angle an entire disk 15 degrees to the center

Kent1Cooper — Wed, 22 Sep 2021 14:00:24 GMT

@Anonymous wrote:

....but will beveling it keep the indents I have on the shape?

Unfortunately, no. I Extruded a Circle at the outside edge, downward with a 75° taper angle, and Subtracted it from the original Solid. Some of your source shapes for the indentations are there, but the indentations have all been cut off by the Subtracting.

I suspect you would need to rotate those source shapes downward by the same 15° from the nearest point on the outer edge, and do the same process you did before to make the indentations in the canted surface.

Re: Angle an entire disk 15 degrees to the center

Anonymous — Wed, 22 Sep 2021 16:10:56 GMT

@Kent1Cooper That was the original plan...I can rotate the objects around the x and z or y and z axis, and the xz yz axis for 45°, but between 0° and 45°, I have no idea what the math would be to make the rotation even towards the same point.

Re: Angle an entire disk 15 degrees to the center

Kent1Cooper — Wed, 22 Sep 2021 16:49:59 GMT

I would, for the Omega shape that you have the outline of in the drawing, use UCS with the ZAxis option, give it the QUAdrant point of the outer-rim Circle as the base, and pull downward in the Y direction to tell it the new Z axis direction. Then you can Rotate the Omega about 0,0 by 15° [the yellow here]:

For the other outlines you need a different origin and Z-axis direction, or you could Rotate them in the WCS to that same position, do the same Z-axis change and Rotate with them, and back in the WCS, Rotate them back to where they were.

I would suggest doing the Lofting or PressPulling or whatever to get the Solids to cut away, first, then do this operation with one of those of each shape, and Array them once all set.

To be nit-picky, the surface you're carving the indentations out of will be conical, not flat, so if the shapes are made with something like PressPull, the depth of indentation will vary slightly across the width of each shape.

Re: Angle an entire disk 15 degrees to the center

Valentin_CAD — Wed, 22 Sep 2021 16:59:21 GMT

@Anonymous ,

Are you trying to make it look like this?

Re: Angle an entire disk 15 degrees to the center

Patchy — Wed, 22 Sep 2021 17:18:30 GMT

Why not slice the top, copy a bunch of them, UNION them and then slice 15 degrees. Then add the solid bottom that got cut off? There are a bunch of ways.

Re: Angle an entire disk 15 degrees to the center

Anonymous — Wed, 22 Sep 2021 23:38:53 GMT

Yes, exactly like that! 🙂

Re: Angle an entire disk 15 degrees to the center

SEANT61 — Thu, 23 Sep 2021 08:20:16 GMT

Another alternative. Here, I've managed to keep the engravings as perpendicular cuts. See attached drawing for steps.

Re: Angle an entire disk 15 degrees to the center

Valentin_CAD — Thu, 23 Sep 2021 11:23:44 GMT

@Anonymous ,

@Anonymous wrote:
... I need to angle this entire face towards a specific point, by 15 degrees. My idea in my head is like shifting it to a line of a cone ...

Here is a brief explanation.

First:

Make a COPY of the object and EXPLODE. ERASE everything except the engraving portion and then EXTRUDE.

A 15 degree cone will be use to SUBTRACT from the top. Then COPY those objects down and SUBTRACT - to make the bottom also 15 degree.

Second:

Just like you said, create a "cone" at 15 degrees. Adjust your UCS before creating the triangle within the object by drawing a line from the QUADRANT snap to CENTER, then ROTATE line 15 degrees (Trim or Extend). JOIN the lines and use REVOLVE to create the coned object (REVOLVE 360). Now SUBTRACT the cone from the circular ring to obtain a beveled edge.

Third:

Move the engraving objects down to the circle and SUBTRACT.

Re: Angle an entire disk 15 degrees to the center

Kent1Cooper — Thu, 23 Sep 2021 13:16:00 GMT

@Valentin_CAD wrote:

... create a "cone" at 15 degrees. Adjust your UCS before creating the triangle within the object by drawing a line from the QUADRANT snap to CENTER, then ROTATE line 15 degrees (Trim or Extend). JOIN the lines and use REVOLVE to create the coned object (REVOLVE 360). ....

You can make the cone with a single command, without the Lines/Trim/Extend/Join/Revolve steps. See the beginning of Message 6.

Re: Angle an entire disk 15 degrees to the center

Kent1Cooper — Thu, 23 Sep 2021 13:27:09 GMT

@SEANT61 wrote:

... to keep the engravings as perpendicular cuts. ....

That's an important question in my mind, @Anonymous : does the difference between indentations that are perpendicular to the conical surface and those that are vertical projections from the flat original matter? The vertical-projection ones will be about 3.5% longer in their radial-direction extent on the surface, the round ones won't be quite circular, the "horizontal" parts of the Omega and O and [whatever that other shape is] will be wider than the "vertical" parts if those were of equal width in the flat originals, etc.