When hole depth reaches the other end of the object, the full thin disappears.

[Bance]

Which sketch are we talking about?

There is only one called sketch.

[Enomeee]

Which FC version ?

Sketch(000) :
* T jonctions are forbidden
* 2 lines at the same place

Sketch m4 :
* support=Face : bad practice (TNP)
* tool PartDesign_Hole needs only circle (or arc), not rectangle (use Sketcher_ToggleConstruction)

Sketch 10es lyuk :
* dimension=0 : bad practice => use Sketcher_ConstrainPointOnObject

Sketch004 :
* twice 4mm : bad practice => use Sketcher_ConstrainEqual
* support=Face : bad practice (TNP)

At the end : Refine=true

wow, thank you very much! It seams like I mad lot of mistakes. Where can I learn the good practices?

[Enomeee]

Which FC version ?

Sketch(000) :
* T jonctions are forbidden
* 2 lines at the same place

Sketch m4 :
* support=Face : bad practice (TNP)
* tool PartDesign_Hole needs only circle (or arc), not rectangle (use Sketcher_ToggleConstruction)

Sketch 10es lyuk :
* dimension=0 : bad practice => use Sketcher_ConstrainPointOnObject

Sketch004 :
* twice 4mm : bad practice => use Sketcher_ConstrainEqual
* support=Face : bad practice (TNP)

At the end : Refine=true

wow, thank you very much! It seams like I've made lot of mistakes. Where can I learn the good practices?

[Bance]

Where can I learn the good practices?

Start here:-

https://forum.freecadweb.org/viewtopic.php?f=3&t=2264

[Shalmeneser]

wow, thank you very much! It seams like I mad lot of mistakes. Where can I learn the good practices?

* Do a lot
* Break a lot
* Suffer a lot
* Repair a lot
* reThink a lot


some tutorials in the wiki

[chrisb]

Where can I learn the good practices?

Concerning Sketching you can have a look at the document in my signature.
Adding to the previous posts I recommend to thoroughly think about where to place your model in 3D space. Doing so you can often avoid attaching Sketches to faces.
Make the first pad and pocket in one step, the sketch is still simple enough:

SnipScreenshot-4ce2a8.png (6.76 KiB) Viewed 893 times

Use external geometry im m4 to get the now different position of the end of the object.

Use external references in 10es lyuk to get the center between the points, don't recalculate it a second time.

In case of plain holes, use pocket instead of hole. I left the hole here because you marked them as threaded.

[Enomeee]

Where can I learn the good practices?

Concerning Sketching you can have a look at the document in my signature.
Adding to the previous posts I recommend to thoroughly think about where to place your model in 3D space. Doing so you can often avoid attaching Sketches to faces.
Make the first pad and pocket in one step, the sketch is still simple enough:
SnipScreenshot-4ce2a8.png
Use external geometry im m4 to get the now different position of the end of the object.

Use external references in 10es lyuk to get the center between the points, don't recalculate it a second time.

In case of plain holes, use pocket instead of hole. I left the hole here because you marked them as threaded.

Thank you very much for your help too!

[Bance]

Any chance of your version info?