Help - How to create a custom 3D curved surface

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Lukeyson
Posts: 9
Joined: Thu May 20, 2021 9:36 am

Help - How to create a custom 3D curved surface

Post by Lukeyson »

Hi all

I am hoping to get some pointers on how to do a custom 3D curved surface. I am only a basic enthusiast user of Freecad, currently using version 0.20 on windows 10 (base build).

Would anyone have any suggestions on how I should go about this?

Description:

My application is to replace a Driveway Bollard Light Base Plate that has been inadvertently dismembered by an inattentive learner driver. I have generated the basic top-down shape easy enough and have 3D printed a test piece to validate fitment to existing bolt locations and the curve of the bollard itself. I am ready to expand this now and attempt to prototype the final item.

I was thinking that I could just increase the heights of my various extrusions, add some internal cuts, and get the volume and strength needed. My nemesis though is the custom slanted curved surfaces on either side. I was hoping there might be a way to create solids with the custom curved surfaces needed, and cut away that curve from the base body? Or could there be a way to do it during the extrusion?

I'd thought at first a top and bottom sketch with a loft might do it, but that bottom curve is itself not on a flat plane so I don't yet have the skill to know how to draw it. I also thought perhaps a large Tube could be used, and slanted such that the inner surface of the tube cuts it away - but placing that would seem to be hit and miss and lacking in accuracy. Are there any Gui based approaches for creating custom curved surfaces as described? I am no Python-ista I'm afraid. I have attached some images to show my rudimentary efforts and the reconstituted (thanks super glue) base plate that I am trying to replicate.

Image

Image




Luke
demonlibra
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Joined: Tue Jan 21, 2020 1:11 pm

Re: Help - How to create a custom 3D curved surface

Post by demonlibra »

The same way is possible in Part workbench.
Peek 2022-09-28 08-12.gif
Peek 2022-09-28 08-12.gif (598.29 KiB) Viewed 1389 times
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papyblaise
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Re: Help - How to create a custom 3D curved surface

Post by papyblaise »

one idea without dim :?:
Attachments
base.JPG
base.JPG (26.5 KiB) Viewed 1299 times
base.FCStd
(196.79 KiB) Downloaded 17 times
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Shalmeneser
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Re: Help - How to create a custom 3D curved surface

Post by Shalmeneser »

I think the round face is just a part of a sphere :
You need to give us some dimension and a picture where WE will be able to find the radius and the center (orientation like in my picture).
Attachments
Capture du 2022-09-28 17-22-03.png
Capture du 2022-09-28 17-22-03.png (4.39 KiB) Viewed 1272 times
BadDriver_SHALM.FCStd
(55.68 KiB) Downloaded 20 times
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Bernard19
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Re: Help - How to create a custom 3D curved surface

Post by Bernard19 »

Hello,
@demonlibra How do you finish this item?
demonlibra
Posts: 79
Joined: Tue Jan 21, 2020 1:11 pm

Re: Help - How to create a custom 3D curved surface

Post by demonlibra »

Bernard19 wrote: Wed Sep 28, 2022 4:55 pm Hello,
@demonlibra How do you finish this item?
Sorry, do not understand your question.
domad
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Re: Help - How to create a custom 3D curved surface

Post by domad »

Lukeyson wrote: Wed Sep 28, 2022 2:27 am ....
Hi Lukeyson, hello to the Community!
One of the many modeling flows, the attached example (obviously always improvable and can also be modeled with the wb "Part") was created using the wb "Part design", "Sketcher" with the "collaboration" of the wb " Draft ", regardless of the measures but simply to show the modeling phases.
Attachments
Driveway_Bollard_Light_Base_Plate.FCStd
(920.03 KiB) Downloaded 32 times
Driveway_Bollard_Light_Base_Plate.gif
Driveway_Bollard_Light_Base_Plate.gif (668.96 KiB) Viewed 1132 times
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Bernard19
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Re: Help - How to create a custom 3D curved surface

Post by Bernard19 »

Hello,
@domad Very nice achievement.
I'm going to do this exercise again following your method.
Cordially
domad
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Re: Help - How to create a custom 3D curved surface

Post by domad »

Bernard19 wrote: Thu Sep 29, 2022 6:05 am ....
Hi Bernard19, greetings to the Community!
Thanks, I'm glad you appreciated even more for wanting to try to reproduce the modeling, however, I warn you of possible problems with the "Create Thickness" function, depending on the thickness chosen, intersections are created that will inevitably lead FreeCad to failure, in this case it could be possible to opt for an internal subtractive modeling, then create the conformed seats for the screws.
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papyblaise
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Re: Help - How to create a custom 3D curved surface

Post by papyblaise »

A bit faster to do the half moon in one chot
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base2.FCStd
(554.46 KiB) Downloaded 20 times
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