The example with the cube and the subtractive loft using face anchored sketches was brilliantly simple and insightful for me. Another important level of understanding attained so Thank you!
Not sure whether you covered it allready, but a tutorial to make a "plastic" thread - both screw and nut - for 3D printing would be great. I guess I need to use also a loft and a profil for the plastic thread.
I made some as experiments in older versions of Freecad. I used holes for female threads, and for the threads I used SubtractiveHelix. It works quite nice in 1.0. Draw a rectangle 3mm wide and 30 mm tall aligned to the origin. Draw another sketch with a triangle that will be used to cut out the thread. Make it overlap the rectangle a bit. Then, a 360 degree revolution in the first sketch. And a SubtractiveHelix on the second sketch.
Have I misunderstood something, or is this a viewing / presentation software bug? At 2:52 you adjusted the Z-Attachment-Offset to move it to the right. But according to a small axis map (bottom right) the adjustment should be on the Y-axis (green) and not on the Z-axis (blue).
This is something I noticed as well. The Z position was changed but the sketch moved in the global Y direction. I thought sketch coordinates shared the same orientation as the global. Is this not so?
When I saw the Sketch being changed in Z-position, but moving in Y, I directly wanted to ask the same question as well, because I do not see any logical rule or reason behind this move in "Z". This drives me nuts since years, and I place my sketches so far simply by try and error. It's the same for rotation.. Lets's hope that Darren finds some minutes to explain this mystery. Edit: at 17:30, all of a sudden, the position to be changed is in the Y direction, not any longer in Z as before. Confusing.
I stumbled in this problem too, so maybe I can add some information. How to identify, whether the inner and outer walls cross from profile to profile: * Change the view from "Original" to "wireframe" -> here you can see much better, whether the inner and outer wall cross and change their properties * whether wall lines cross, doesn't depend on the sketch (or userinput) so much, but in what direction the Normale of the sketch is pointing to (and this is not up in the hand of the user). This is really hard to correct/debug, if you got multiple sketches and datum planes in relation to each other. So the standard tools for this (extrude, additive/subtractive loft, additive/subtractive pipe) only can do (very limited) standards. For more control, it is better to separate these steps: Construct a solid outer and a solid inner and subtract them (the inner form the outer) later. If you got a COMPLEX outer object/body and a COMPLEX inner object/body, it is better to construct these one by one and cut it later from each other. Problem here is, that you can't set the values regarding the properties inner/outer object/body in relation to each other ...directly. As an example, you can not set the thickness of the wall as a constraint. Solution is to go for a "Master", which is managing the regarding constraints and fix-points/fix-lines/fix-surfaces and an "Inner" and "Outer", which takes these constraints and works with them to provide the inner and outer form. PS.: This should cover all use cases. You can't have a filled inner in and empty outer surrounded by another filled outer ...because there is no fixation for that.
Ok. But how do you identify swapped geometry when you're making the sketches. It just seems odd. If I have a hollowed cylinder in 2D by creating an inner diameter and then an outer diameter and do the opposite for the end loft, why does it care if the geometry is literally the same between sketches? Does FC understand the order of the geometry created in the sketch? Is that how that works?
The example with the cube and the subtractive loft using face anchored sketches was brilliantly simple and insightful for me. Another important level of understanding attained so Thank you!
Awesame. Thank you very much 🙂
Great video as always. Thanks.
Hi Darren, and the voice that comes back 😊
Merry Christmas 🎄
Thanks for sharing 👍 and Happy New Year to you and your family 😊
Awesome as always.
Thank you sir
Not sure whether you covered it allready, but a tutorial to make a "plastic" thread - both screw and nut - for 3D printing would be great. I guess I need to use also a loft and a profil for the plastic thread.
I made some as experiments in older versions of Freecad. I used holes for female threads, and for the threads I used SubtractiveHelix.
It works quite nice in 1.0. Draw a rectangle 3mm wide and 30 mm tall aligned to the origin.
Draw another sketch with a triangle that will be used to cut out the thread. Make it overlap the rectangle a bit.
Then, a 360 degree revolution in the first sketch.
And a SubtractiveHelix on the second sketch.
Thanks.
Have I misunderstood something, or is this a viewing / presentation software bug? At 2:52 you adjusted the Z-Attachment-Offset to move it to the right. But according to a small axis map (bottom right) the adjustment should be on the Y-axis (green) and not on the Z-axis (blue).
This is something I noticed as well. The Z position was changed but the sketch moved in the global Y direction. I thought sketch coordinates shared the same orientation as the global. Is this not so?
When I saw the Sketch being changed in Z-position, but moving in Y, I directly wanted to ask the same question as well, because I do not see any logical rule or reason behind this move in "Z". This drives me nuts since years, and I place my sketches so far simply by try and error. It's the same for rotation.. Lets's hope that Darren finds some minutes to explain this mystery. Edit: at 17:30, all of a sudden, the position to be changed is in the Y direction, not any longer in Z as before. Confusing.
Although I completely followed all operations as demonstrated here, FreeCAD issued "Redundunt Constraints (8)" at 1:53
I stumbled in this problem too, so maybe I can add some information.
How to identify, whether the inner and outer walls cross from profile to profile:
* Change the view from "Original" to "wireframe" -> here you can see much better, whether the inner and outer wall cross and change their properties
* whether wall lines cross, doesn't depend on the sketch (or userinput) so much, but in what direction the Normale of the sketch is pointing to (and this is not up in the hand of the user).
This is really hard to correct/debug, if you got multiple sketches and datum planes in relation to each other.
So the standard tools for this (extrude, additive/subtractive loft, additive/subtractive pipe) only can do (very limited) standards.
For more control, it is better to separate these steps: Construct a solid outer and a solid inner and subtract them (the inner form the outer) later.
If you got a COMPLEX outer object/body and a COMPLEX inner object/body, it is better to construct these one by one and cut it later from each other.
Problem here is, that you can't set the values regarding the properties inner/outer object/body in relation to each other ...directly. As an example, you can not set the thickness of the wall as a constraint.
Solution is to go for a "Master", which is managing the regarding constraints and fix-points/fix-lines/fix-surfaces and an "Inner" and "Outer", which takes these constraints and works with them to provide the inner and outer form.
PS.: This should cover all use cases. You can't have a filled inner in and empty outer surrounded by another filled outer ...because there is no fixation for that.
Ok. But how do you identify swapped geometry when you're making the sketches. It just seems odd. If I have a hollowed cylinder in 2D by creating an inner diameter and then an outer diameter and do the opposite for the end loft, why does it care if the geometry is literally the same between sketches? Does FC understand the order of the geometry created in the sketch? Is that how that works?