Is loft the right tool for this?
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- Posts: 125
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Is loft the right tool for this?
Hi,
I am using FreeCAD 0.21 (also have Link Daily version installed, if needed) on Linux Mint (Ubuntu) 21. The relevant FC file is attached and here are screenshots of the parts and the issue: What I am trying to do is smoothly join the corners of the rectangles so that I have four surfaces defined. I had thought the PartDesign -> Loft tool would get me what I want, but as you can see, there is interpolation between points that I don't want.
In OpenSCAD I had been able to accomplish this by creating paths and using a spline/bezier type tool. But it was clunky and I'd like to accomplish the same thing in FC.
I tried playing around with the Curves and Surface workbenches, as well as looked through other downloadable macros/workbenches. But I don't seem to be finding the right tool or workflow.
Can anyone point out how to accomplish this? Ultimately, I am trying to create a piece that looks like this Thanks in advance for any help.
mconsidine
I am using FreeCAD 0.21 (also have Link Daily version installed, if needed) on Linux Mint (Ubuntu) 21. The relevant FC file is attached and here are screenshots of the parts and the issue: What I am trying to do is smoothly join the corners of the rectangles so that I have four surfaces defined. I had thought the PartDesign -> Loft tool would get me what I want, but as you can see, there is interpolation between points that I don't want.
In OpenSCAD I had been able to accomplish this by creating paths and using a spline/bezier type tool. But it was clunky and I'd like to accomplish the same thing in FC.
I tried playing around with the Curves and Surface workbenches, as well as looked through other downloadable macros/workbenches. But I don't seem to be finding the right tool or workflow.
Can anyone point out how to accomplish this? Ultimately, I am trying to create a piece that looks like this Thanks in advance for any help.
mconsidine
- Attachments
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- a_test.FCStd
- (23.07 KiB) Downloaded 44 times
Re: Is loft the right tool for this?
When using the Part->Loft tool, you can decrease the Max Degree to 2 to reduce oscillation.
Re: Is loft the right tool for this?
Try doing one section at a time.
Re: Is loft the right tool for this?
... Loft in another way:
- Attachments
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- a_test_2.FCStd
- (60.51 KiB) Downloaded 39 times
- papyblaise
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Re: Is loft the right tool for this?
uses the intersection of 2 profiles
- Attachments
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- pied de meule.FCStd
- (264.52 KiB) Downloaded 39 times
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- pied de meule.JPG (18.29 KiB) Viewed 1063 times
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- Posts: 125
- Joined: Wed Jan 18, 2023 10:41 pm
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Re: Is loft the right tool for this?
@hammax: Wow, elegant. Thank you for posting all that. Can you point me to how you got the profile for "Sketch009" or "Sketch010" from the segments? I get that you then used Part_Extrude on each and then Part_Common to get half the pier. And then basically mirrored that for the other half.
I infer you set up two new sketches, one in the XZ plane and the other in the YZ plane and then {here's the magic I don't about}, with the result being two profiles that were constrained to the edges of the sections and connected via a spline???
Thank you again for the help,
mconsidine
I infer you set up two new sketches, one in the XZ plane and the other in the YZ plane and then {here's the magic I don't about}, with the result being two profiles that were constrained to the edges of the sections and connected via a spline???
Thank you again for the help,
mconsidine
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- Posts: 125
- Joined: Wed Jan 18, 2023 10:41 pm
- Location: Randolph, VT USA
Re: Is loft the right tool for this?
@papyblaise :Thank you as well. You went further than I did by adding the plates and holes. I might need to come back to you on that as well
Thanks again,
mconsidine
Thanks again,
mconsidine
Re: Is loft the right tool for this?
I have here used a B-spline with 3 control points, which makes it very smooth. I used the brand new possibility of 0.21 in Sketcher to use point-on-object constraints on a B-spline.
It doesn't quite meet all the intermediate sections, though. If that is a requirement, you woul need a B-Spline with more control points. It could be completed "à la papyblaise".
It doesn't quite meet all the intermediate sections, though. If that is a requirement, you woul need a B-Spline with more control points. It could be completed "à la papyblaise".
- Attachments
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- tower_cb.FCStd
- (15.29 KiB) Downloaded 37 times
A Sketcher Lecture with in-depth information is available in English, auf Deutsch, en français, en español.
Re: Is loft the right tool for this?
I had an issue with the B-Spline on the left side, but the other side worked with a 3-control-points-Bspline surprisingly well too, see https://forum.freecadweb.org/viewtopic. ... 31#p655831.
A Sketcher Lecture with in-depth information is available in English, auf Deutsch, en français, en español.
Re: Is loft the right tool for this?
... I only used 4-Control_Point BSplines with adapted weight radius
snapped to external references on bottom and top - rest by eye.
snapped to external references on bottom and top - rest by eye.
- Attachments
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- a_test_3.FCStd
- FC.20.1
- (59.4 KiB) Downloaded 37 times