Sphere creation

[Ludovic]

Hello,

I'm quite new to FreeCad...
I'm trying to do a sphere (on the last sketch) and it doesn't work.

I want to do half a revolution (on the vertical axis by the center of the circle) of my last sketch...

I think I don't know how to give it the right axis...

OS: Windows 7
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.18.16117 (Git)
Build type: Release
Branch: releases/FreeCAD-0-18
Hash: dbb4cc6415bac848a294f03b80f65e888d531742
Python version: 3.6.6
Qt version: 5.6.2
Coin version: 4.0.0a
OCC version: 7.3.0
Locale: French/France (fr_FR)

If you can help, thank you.

Best regards,

[dcapeletti]

Hey, I've been going over your sketch. You have a line that does not produce a body. I frame it in the image. You can pass that line in build mode.

To create a revolution, you take the sketch and select the axis in which you want the revolution to be made. I attach the new file.

Greetings

[chrisb]

If you want to create a sphere by a revolution you have to model only half a circle. Otherwise you have so called self intersections.

[Ludovic]

Hello,

Thank you very much.
I'm sorry, I didn't explain very well what I'm trying to do.
Let's see the "manual" document.

Best regards,

[Ludovic]

If you want to create a sphere by a revolution you have to model only half a circle. Otherwise you have so called self intersections.

Hello,

Thank you.
I'm sorry, I tried to cut the circle... but it seems it doesn't work.

Best regards

[chrisb]

I can have a look at this tomorrow - if nobody else replies.

[TheMarkster]

You need to use an arc instead of a circle if you only want half the sphere. In the video I put the circle into construction mode, then make an arc. The revolve axis is the construction line that was already there.

phpBB [video]

[chrisb]

There are two more things to say about your model:
- The DatumPlane is unattached, which can make things attached to it unreliable or unpredictable
- The sketch for the sphere contains a 0mm horizontal distance constraint. Use vertical alignment constraint instead. It is in general recommended to prefer geometric constraints over dimensions.

[Ludovic]

You need to use an arc instead of a circle if you only want half the sphere. In the video I put the circle into construction mode, then make an arc. The revolve axis is the construction line that was already there.

phpBB [video]

Hello,

Thank you very much.

Best regards

[Ludovic]

There are two more things to say about your model:
- The DatumPlane is unattached, which can make things attached to it unreliable or unpredictable
- The sketch for the sphere contains a 0mm horizontal distance constraint. Use vertical alignment constraint instead. It is in general recommended to prefer geometric constraints over dimensions.

Hello,

Thank you, I change the constraint to vertical. I was searching for a better solution, and you gave it to me

I don't know how to attach the plan...

Best regards,