David,

Revolve with a trim on the bottom would also have been my first approach.

Your object is not a precise machined part, so we can try a non-precise method.

Create a solid sphere. Select Show Points. Select groups of points with your mouse and move. Use the bounding box handles to spread points symmetrically. Select all points below the "horizon" and use the horizontal alignment tool to make the flat bottom with rounded edges.

This took about one minute to make.

Ed Ferguson

Hi David, I don't think there is anything specific in v3 that would help with this in particular.

Sometimes it can be difficult in general to form something that's kind of asymmetrical with only a couple of profile curves.

Does the control point sculpting method shown by Ed above give you a good way to get a better result?

Is your current model with the trimmed revolve relatively close to what you want with just some tuning needed for removing the dimple or is it not really capturing the shape very well? The control point sculpting type method can probably give you more control over your shaping.

- Michael

thanks ed, I have tried that and haven't got the same result as you yet. I'll keep trying

the one I drew is probably not close.
the pic is a fishing lure that weighs 3/16 oz. I need to draw one that weighs 1/2 oz. what i usually do is draw the 3/16 and then scale it up to the 1/2 oz.
It needs to be close in size because lead is very dense and it doesn't take much to change the weight.
Next I think I will try to draw this as slices from front to back and then loft. I always have trouble with the ends when drawing these kinds of parts.

David -

I've attached the 3dm file if that helps.

Is this drawing for rendering purposes, or will it be used to machine a mold? The answer may dictate the best approach to take.

Ed Ferguson

it is for a mold.

hey thanks for the help.

David -

I'm not the machining expert here, but I think Rail Revolve is going to give you the simplest geometry.

1) Draw profile curve. 2) Rail Revolve. 3) Boolean diff with straight line. 4) Fillet to create rounded bottom edges.

The trick to prevent the pinching shown in your example is to insure the end points of the profile curve are tangent. If you want to be sure, Show Points, select a pair of points, and use the Horizontal Alignment tool to line them up as shown in red. File is attached.

Ed Ferguson