papyblaise wrote: ↑Fri Aug 09, 2019 8:49 am Hello
Do a Datum line as axe for the sphère
facing one half circle on the face of suport
do rotate of half circle around Datum ligne 180°
Do Miror for the other side
don't forget to do Refine sometime totime

Hi,

Thank you.

Best regards,

HarryGeier wrote: ↑Fri Aug 09, 2019 6:33 am HI,

you can attach the datum plane concentric to the circle and offset by 90 deg ROLL

2019-08-09 08_30_36-FreeCAD 0.18.png

i used the edge , but using the sketch lines would be safer..

Hello,

Thank you very much.

Best regards

papyblaise wrote: ↑Fri Aug 09, 2019 12:31 pm Hello
I change Datum plan by Datum Ligne facing on the support
on the same face I do one sketch of halh circle
I rotate it 180°aroud the datum ligne
I do miror for the other side

Hello,

Thank you.
I've finally done it...

Best regards

chrisb wrote: ↑Fri Aug 09, 2019 10:10 pm

Ludovic wrote: ↑Fri Aug 09, 2019 11:35 am I don't know how to attach the plan...

I would make the origin visible, double click on the plane and select YZ-plane with attachment mode XY and set z to -55.

Hello,

Thank you,

Best regards

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 p...

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. https://raw.githubusercontent.com/mwganson/FreeCAD-videos/master/revolve_semicircle....

chrisb wrote: ↑Thu Aug 08, 2019 10:27 pm 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

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,

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 Wo...

Hello, I'm quite new to FreeCad... I'm trying to do a plane (the last I have done in the project) I have done it but I think there is a better solution to do it... I want it to be like the last in my project, but I don't want to says translation -55mm. I want to say that the center of the circle is ...