Drawing a sketch on a curved surface
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Drawing a sketch on a curved surface
I am trying to design and print a ring with a 19.1 mm ID and 6.35 mm wall thickness that has four oval-shaped tongues sticking out at 90 degrees apart from one another, on the outside of the ring. One pair of the tongues are oriented parallel to the plane (z is coming through the ring hole) and the other is perpendicular. My problem is drawing on the OD of the object I have created so far. Sketch requires a planar surface. The tongue would only have to stick out by 4 mm, a long axis of 5mm, and a short axis of 3 mm. I am attaching both the CAD file and a pic of the tongue as I envision it. The idea is that the tongues would slide into grooves holding the ring in one of two orthogonal positions (perpendicular to the ground or parallel).
OS: Win7
FreeCAD ver: .17
OS: Win7
FreeCAD ver: .17
- Attachments
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- IMC TT Mount.FCStd
- (15.32 KiB) Downloaded 35 times
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- Tongue.PNG (15.97 KiB) Viewed 3561 times
Re: Drawing a sketch on a curved surface
Hi Mtrprks, welcome to the forum.
Can you provide an image of what you try to achieve? A link to an image or an uploaded doodle would be fine.
Concerning your model: You can delete both pockets and Pad001. Then use the sketch directly for the pocket.
Can you provide an image of what you try to achieve? A link to an image or an uploaded doodle would be fine.
Concerning your model: You can delete both pockets and Pad001. Then use the sketch directly for the pocket.
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Re: Drawing a sketch on a curved surface
Like this?
- Attachments
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- IMC TT Mount2.FCStd
- (47.32 KiB) Downloaded 57 times
Re: Drawing a sketch on a curved surface
I appreciate you guys taking the time to answer. I doodled something up in paint to best convey what I am trying to get it to look like. The previous comment was close
- Attachments
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- Perpendicular tongue side
- Perp tongue side view.png (22.76 KiB) Viewed 3500 times
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- Perpendicular tongue front
- Perp tongue front view.png (24.71 KiB) Viewed 3500 times
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- Parallel tongue side
- Para tongue side view.png (57.12 KiB) Viewed 3500 times
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- Parallel tongue front
- Para tongue front view.png (25.51 KiB) Viewed 3500 times
Re: Drawing a sketch on a curved surface
One way of doing this is to make the lugs first, another would be to sketch the lugs on a std plane and use attachment offset to position them as required..
See attached.
HTH Steve.
See attached.
HTH Steve.
Re: Drawing a sketch on a curved surface
Thank you very much for your help.
Re: Drawing a sketch on a curved surface
As an update to the gizmo (there is a word I have not used in a while, I'll now refer to all designs-in-progress as gizmos), thanks to everyone's help, I have it looking and dimensioned just how I want it and I'm ready to generate an STL file. Now when I originally pieced this together, I started with a new design in the "Part Design" workbench and created it with four separate "Parts", a padded cylinder with a circular pocket for the central piece, four parts for the lugs, and switched to "Part" workbench to fashion a cylinder that would give me the hole in the ring (for a set screw). When it came time to export an STL i was trying to decide how best to do so. I thought I should combine them into a single entity and then export. Combing them was a curious process because depending how I did it, seemed to leave various artifacts behind. For example: trying to Boolean combine individual parts caused the "Cut" to not appear and other weird figments. Eventually I arrived at the successful output (I think?) shown in "....Mount 5". "...Mount 3" is the original form.
My questions are these: Did I use the most effective means in designing this object? Did I use the best way in combining the parts? I feel there are many, many ways to skin this cat but I'd like to hear from the more experienced users on their advice. I also feel I am causing much of my own confusions misunderstanding the hierarchy and dependency of the project tree
Thanks!
My questions are these: Did I use the most effective means in designing this object? Did I use the best way in combining the parts? I feel there are many, many ways to skin this cat but I'd like to hear from the more experienced users on their advice. I also feel I am causing much of my own confusions misunderstanding the hierarchy and dependency of the project tree
Thanks!
- Attachments
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- Project Tree
- tree.PNG (38.8 KiB) Viewed 3384 times
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- Gizmo
- gizmo.png (89.85 KiB) Viewed 3384 times
Re: Drawing a sketch on a curved surface
As a rule when designing in PD workbench it's best to stay there.
You could quite easily have used a subtractive feature to create the set screw hole, or a sketch on a datum plane, or a sketch on a std plane with appropriate positioning. This keeps the History tree nice and clean, and provides a single active(visible) body for export.
See enclosed.
There will be other views I'm sure someone else will chip in!
HTH Steve.
You could quite easily have used a subtractive feature to create the set screw hole, or a sketch on a datum plane, or a sketch on a std plane with appropriate positioning. This keeps the History tree nice and clean, and provides a single active(visible) body for export.
See enclosed.
There will be other views I'm sure someone else will chip in!
HTH Steve.
Re: Drawing a sketch on a curved surface
Part design bodies are meant to be single contiguous solids, such as are printed by 3D printers.
There is no need to create a separate body for each feature of the object, unless it is to be fabricated separately.
So designing a wooden chair for example would require separate bodies for each piece, because they are made singularly and joined to form the whole. Whereas a casting mold would be a single object in a single body. Does that make sense?
Steve.
There is no need to create a separate body for each feature of the object, unless it is to be fabricated separately.
So designing a wooden chair for example would require separate bodies for each piece, because they are made singularly and joined to form the whole. Whereas a casting mold would be a single object in a single body. Does that make sense?
Steve.
Re: Drawing a sketch on a curved surface
Thanks for your time in clarifying for me. It helped very much!