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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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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.

enter image description here

Then add a Curve>Bezier.

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Edit the bezier curve to be the shape you need.

enter image description here

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

enter image description here

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

enter image description here

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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 Nov 4 '16 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 Nov 5 '16 at 11:01

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