[0.17] Align plane to cone wall
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[0.17] Align plane to cone wall
I'm practicing by following the Reddit cad challenge https://www.reddit.com/r/cad/comments/6 ... llenge_23/ and I'm stuck creating the "B" Moderate exercise.
I created the cone and I don't seem to be able to align a plane to the sloped wall.
Up to now I've only created cylinders and I have been following the example of the "FC v0.17dev: Part Design Next Usecases and Best practices" of attaching the plane to the top and then moving it to the appropriate location. With the cone is it possible to attach the plane directly to the cone wall?
Thanks
Sal
I created the cone and I don't seem to be able to align a plane to the sloped wall.
Up to now I've only created cylinders and I have been following the example of the "FC v0.17dev: Part Design Next Usecases and Best practices" of attaching the plane to the top and then moving it to the appropriate location. With the cone is it possible to attach the plane directly to the cone wall?
Thanks
Sal
- Attachments
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- N23_Moderate.fcstd
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Last edited by jmaustpc on Fri Apr 28, 2017 3:00 pm, edited 1 time in total.
Reason: Add [0.17] to subject
Reason: Add [0.17] to subject
Re: Align plane to cone wall
Hi salp,
Those challenges seem fun.
In FreeCAD, cylindrical, conical and spherical faces have a split line, or "seam". So one of the cone wall seam vertices can be used. But I couldn't find how to make it work with the conical face. I could only make it work by selecting both vertices. I have no idea if this is a bug, or if it works as intended, but the help text is wrong.
Now I thought that the Extra placement properties would allow to rotate the Datum plane on the Body's Z Axis, but it doesn't, or I didn't find how.
So you got a datum plane tangent to the conical face, but based on the blueprint, it's on the other side of where you want it (should be to the right of the YZ plane). So you got three options:
Next problem is how to figure out the offset value from the conical face: in section D-D, where the heck is that 21.32 dimension attached to?!? The 11 dim makes just a little more sense but is not really useful either. It's a stupid way of dimensioning if you ask me...
Good luck!
Those challenges seem fun.
Yes it is, with some limitations. When creating a Datum plane with no pre-selection, all the existing attachment modes are listed. There's a Tangent to Surface mode, its help tool tip mentions that a vertex and a face are needed.salp wrote:With the cone is it possible to attach the plane directly to the cone wall?
In FreeCAD, cylindrical, conical and spherical faces have a split line, or "seam". So one of the cone wall seam vertices can be used. But I couldn't find how to make it work with the conical face. I could only make it work by selecting both vertices. I have no idea if this is a bug, or if it works as intended, but the help text is wrong.
Now I thought that the Extra placement properties would allow to rotate the Datum plane on the Body's Z Axis, but it doesn't, or I didn't find how.
So you got a datum plane tangent to the conical face, but based on the blueprint, it's on the other side of where you want it (should be to the right of the YZ plane). So you got three options:
- Leave it there, and work as if the part was rotated 180 degrees on its Z axis in reference to the blueprint;
- Create somehow a datum line or a sketch on the XZ plane lying on the face of the conical face, so you have vertices to create your datum plane; I found no parametric way of doing that without resorting to expressions (too convoluted)
- Realign the Revolution sketch so it starts on the other side of the YZ plane, so the conical seam will be on the right side. This is really simple: under the Sketch properties, toggle the Map Reverse property to true.
Next problem is how to figure out the offset value from the conical face: in section D-D, where the heck is that 21.32 dimension attached to?!? The 11 dim makes just a little more sense but is not really useful either. It's a stupid way of dimensioning if you ask me...
Good luck!
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Re: Align plane to cone wall
It is a bug, another variant of it was reported recently for plane on three points mode.NormandC wrote:In FreeCAD, cylindrical, conical and spherical faces have a split line, or "seam". So one of the cone wall seam vertices can be used. But I couldn't find how to make it work with the conical face. I could only make it work by selecting both vertices. I have no idea if this is a bug, or if it works as intended, but the help text is wrong.
Re: Align plane to cone wall
Well I was only looking at the projected view at the right and just now noticed that the whatchamacallit at 45 degrees from top view isn't a polar pattern of the other feature.
And with the revolution having created the cone empty, a tangent plane rotated 45 degrees is going to be required, with no obvious way of creating the necessary vertices.
I'll think about it...
And with the revolution having created the cone empty, a tangent plane rotated 45 degrees is going to be required, with no obvious way of creating the necessary vertices.
I'll think about it...
Re: Align plane to cone wall
Cool, if it was reported for the 3-point mode, should I create a separate ticket?DeepSOIC wrote:It is a bug
- DeepSOIC
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Re: Align plane to cone wall
Up to you. I don't remember if that bug was added to tracker...
- DeepSOIC
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Re: Align plane to cone wall
https://forum.freecadweb.org/viewtopic.php?t=21738
Looks like there's no tracker ticket for it.
Looks like there's no tracker ticket for it.
Re: Align plane to cone wall
NormandC thanks for the reply.
Your helpful as always.
Sal
Your helpful as always.
Sal
Re: Align plane to cone wall
Found it.NormandC wrote:And with the revolution having created the cone empty, a tangent plane rotated 45 degrees is going to be required, with no obvious way of creating the necessary vertices.
Datum point with "On edge" attachment mode. Just select a circular edge of the cone. By default the datum point is created at the start of the edge, which aligns with the seam. The datum point has a Map Path Parameter property that can have a value between 0 and 1, which corresponds to a ratio of the relative length along the edge. So to locate the datum at 225 degrees counterclockwise from the XY plane, I entered a simple expression (225/360) because I'm lazy.
Because of the mentioned bug, I had to create two datum points, one for each circular edge of the cone, I was then able to create a datum plane where I wanted it.
I'll try to record one over the weekend.DeepSOIC wrote:Looks like there's no tracker ticket for it.
Glad to help. Could you do me a favour, and edit your first post to add [0.17] to the start of your Subject? This way it's clear from the list of topics this is about the development version. Thanks.salp wrote:NormandC thanks for the reply.
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- N23_Moderate_normandc1.fcstd
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Re: [0.17] Align plane to cone wall
hi
with my Macro Plane (not finished) select the "couture" and click
mario
with my Macro Plane (not finished) select the "couture" and click
mario
Maybe you need a special feature, go into Macros_recipes and Code_snippets, Topological_data_scripting.
My macros on Gist.github here complete macros Wiki and forum.
My macros on Gist.github here complete macros Wiki and forum.