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I appreciate your attempt and time spent. It's an amazing showcase how simple things could be easily expressed in OpenSCAD. But the part in question sadly is no

by bvrmn 2y ago

I appreciate your attempt and time spent. It's an amazing showcase how simple things could be easily expressed in OpenSCAD. But the part in question sadly is not that simple. All tangents are wrong.

WillAdams 2y ago
Getting the tangents right is a hull() operation. The balance is a bit more involved --- I'll see if I can find time to model this in a couple of ways....
timonoko 2y ago
Erh? Are you complaining about some minor adjustment, so that lines are not meeting the curves smoothly? I did not even understand what TANGENT means, cause I know much nothing about CAD.
- throwgfgfd25 2y ago
  I have been exactly where you are right now :-) You are right on a precipice between what you know, and falling into a deep, deep trough of CAD knowledge! https://en.wikipedia.org/wiki/Tangent_lines_to_circles https://en.wikipedia.org/wiki/Tangent_lines_to_circles You absolutely don't need to get into the maths to get value from this idea. The maths terrifies me. Just know this core concept: a tangent line meets a circle only once and is at right angles to the radius when it does. Here's why this is valuable in CAD environments that properly support it: once you know how a tangent line works, and see how a constraint-based modeller represents them, it is possible to understand how to model a whole set of smoothly rounded features that the CAD package can automatically adjust to changes made to core measurements, retaining this perfect "join". Rounded slots, curved rounded slots, fillets, all sorts of interesting motion components, etc.
- bvrmn 2y ago
  Yes. Lines should touch circles in a smooth way. There could be many arguments why it's kinda important. Like fit to other parts in a final assembly or production complexity. But even for DIY purposes this minor adjustments would suck a lot of blood in prototype phase, it's a way more simpler to constraint it to be smooth (tangent) and forget about all tweaks needed after dimension changes.
- LiamPowell 2y ago
  I've overlaid your part on the correct part (as best I can when working with the mesh files that come out of OpenSCAD). Your part is drawn in red: https://i.imgur.com/12y5q1t.png https://i.imgur.com/12y5q1t.png

by bvrmn 2y ago

I appreciate your attempt and time spent. It's an amazing showcase how simple things could be easily expressed in OpenSCAD. But the part in question sadly is not that simple. All tangents are wrong.

WillAdams 2y ago

Getting the tangents right is a hull() operation. The balance is a bit more involved --- I'll see if I can find time to model this in a couple of ways....

timonoko 2y ago

Erh? Are you complaining about some minor adjustment, so that lines are not meeting the curves smoothly? I did not even understand what TANGENT means, cause I know much nothing about CAD.

throwgfgfd25 2y ago
I have been exactly where you are right now :-) You are right on a precipice between what you know, and falling into a deep, deep trough of CAD knowledge! https://en.wikipedia.org/wiki/Tangent_lines_to_circles https://en.wikipedia.org/wiki/Tangent_lines_to_circles You absolutely don't need to get into the maths to get value from this idea. The maths terrifies me. Just know this core concept: a tangent line meets a circle only once and is at right angles to the radius when it does. Here's why this is valuable in CAD environments that properly support it: once you know how a tangent line works, and see how a constraint-based modeller represents them, it is possible to understand how to model a whole set of smoothly rounded features that the CAD package can automatically adjust to changes made to core measurements, retaining this perfect "join". Rounded slots, curved rounded slots, fillets, all sorts of interesting motion components, etc.
bvrmn 2y ago
Yes. Lines should touch circles in a smooth way. There could be many arguments why it's kinda important. Like fit to other parts in a final assembly or production complexity. But even for DIY purposes this minor adjustments would suck a lot of blood in prototype phase, it's a way more simpler to constraint it to be smooth (tangent) and forget about all tweaks needed after dimension changes.
LiamPowell 2y ago
I've overlaid your part on the correct part (as best I can when working with the mesh files that come out of OpenSCAD). Your part is drawn in red: https://i.imgur.com/12y5q1t.png https://i.imgur.com/12y5q1t.png