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(Solved) I am relatively new to blender and I am trying to make a concave disk (or really short cylinder) and I can't find any tutorials on how to do this. Could somebody please point me in the direction of a tutorial or tell me how? The shape I am trying to get is below. Thanks.

concavedisk1

concavediskdiagram
(source: ingersolltillage.com)

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4 Answers 4

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Create a UV Sphere and delete the bottom half of it in Edit Mode. Go back into Object Mode, select the entire half-sphere and scale it only on the Z axis. (press "Z" while scaling is activated) That should give you a concave disk.

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To have a high level of control of the shape, and thickness, you can model profile of the disc and use Spin tool to create a mesh, like this:enter image description here

Don't forget to remove doubles at the end.

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You can do this with curves.

Add a Curve>Circle.

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Then add a Curve>Bezier.

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Edit the bezier curve to be the shape you need.

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Exit edit mode, select the circle and make the bezier curve the bevel object.

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Tofurhter refine the shape you can always go back and edit the bezier curve until you get what you need.

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Add a UV sphere Smooth the shading. Go to edit mode and delete the vertex how much u need the sphere curve size, add solidify modifier and edge modifier for sharp edge. U can select and press to z axis if u need little flat. enter image description here

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  • $\begingroup$ Thanks, I think I'll use this method for now. Not too difficult. Sometimes I wish blender (an other 3D modelling programs) had a larger variety shapes. $\endgroup$
    – Benji Collins
    Commented Nov 4, 2016 at 20:43
  • $\begingroup$ @BenjiCollins There are addons that you can enable in the User Settings that do add a greater variety of shapes, but of course not all. But given how quick it is to create this, it's not such a big deal. (unless you're trying to be parametric / precise) $\endgroup$
    – Kroltan
    Commented Nov 5, 2016 at 11:01

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