I have a dilemma. This dilemma is almost 2 decades old now. In fact this dilemma is probably at least 6,000 yrs old. Long story short, make a truncated cone approximately 6 inches in size, with a side angle of say 45 degrees; shelled out to a wall thickness of a ratio of about 1.5% of its overall…

Depending on how you create the cone, you can use push/pull… [image]

[image] CAD CAM CNC: Now, “scale” said object X,Y and not Z. And do this “scaling” without the shell walls changing angle and thickness. Well, you can’t scale a truncated cone in XY and not Z without changing its angle - try it on a non-thicknessed cone surface. Basically you need to Offset …

Hi @lander , [image] CAD CAM CNC: And do this “scaling” without the shell walls changing angle and thickness. Rhino’s Scale commands use affine transformations to modify geometry. So, these commands on their own will not help you achieve your goal. – Dale

[image] Helvetosaur: Well, you can’t scale a truncated cone in XY and not Z without changing its angle - try it on a non-thicknessed cone surface. Basically you need to Offset the truncated cone edges in XY by the same linear amount top and bottom to keep the same angle. Not the same thing as sc…

Hello- it’s hard to tell but sounds like maybe what you want is features - a cone that knows it is a cone - an offset or wall thickness that knows its value and matains it whatever you do with the cone. Rhino touches on this stuff in GH and slightly, here and there, in plain Rhino, and cerainly it…

[image] CAD CAM CNC: Now, “scale” said object X,Y and not Z. And do this “scaling” without the shell walls changing angle and thickness. If you want to do that just explode the truncated cone and scale3d just the cone part and then createsolid to turn it back into a truncated cone. truncated…

I appreciate your ponderings. And the ponderings of others on this matter. It’s understandable that no one should have to struggle on this type of dilemma for 19yrs or more. Yes it seems to be a matter of ‘parametric features’ etc., so I’m grateful to look forward to spending more time with Grass…

Of course if you plan stuff like this in advance, you don’t even need GH. Of course this only works with simple examples like a cone… [image] 2023-08-15_22-48-42 World's leading screen capture + recorder from Snagit + Screencast by Techsmith. Capture, edit and share professional-qualit…

No push-pull, this is V7, just a simple revolve of a closed profile with history on.

Proposal for Expansion(Grow) tools rather than Scaling(Stretch) tools

Rhino Rhino for Windows

lander (CAD CAM CNC) August 15, 2023, 11:35pm 10

That’s pretty cool though, you must be using history and push pull

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Proposal for Expansion(Grow) tools rather than Scaling(Stretch) tools

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