Sketch of sheetmetal face to position holes

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ozindfw
Posts: 16
Joined: Wed May 08, 2019 3:19 pm

Sketch of sheetmetal face to position holes

Post by ozindfw »

Freecad newbie.

I'm trying to add some holes to a sheetmetal part. I'm using https://wiki.freecad.org/SheetMetal_SketchOnSheet as my guide.

My problem is that I do not see how to get a sketch of the selected face to work with. If I select the fact and go to the sketcher wb and select new sketch I get a dialog that seems to make sense "Select the method to attach this sketch to the selected object." Flatface or InertalCS The sketch is grayed out in the tree view. The sketch does not seem to have any features from the selected face.

I was expecting to see at least a rectangle or construction lines that I could use to constrain hole positions. It looks like all I may be getting is a sketch plane, and it's not even clear it's locked to the coordinates of the part.

And why is in grayed out in tree view even if I have a feature drawn on it?

What am I missing here? (besides a clue)

I know I could use the partdesign hole tool, but I still need a sketch to apply it.


Code: Select all

OS: Windows 10 Version 2009
Word size of FreeCAD: 64-bit
Version: 0.20.2.29177 +426 (Git)
Build type: Release
Branch: (HEAD detached from 0.20.2)
Hash: 930dd9a76203a3260b1e6256c70c1c3cad8c5cb8
Python 3.8.10, Qt 5.15.2, Coin 4.0.1, Vtk 8.2.0, OCC 7.6.3
Locale: English/United States (en_US)
Installed mods: 
  * Assembly4 0.12.5
  * ExplodedAssembly
  * fasteners 0.4.54
  * kicadStepUpMod 10.17.1
  * Manipulator 1.5.0
  * sheetmetal 0.2.61
Attachments
HV_Cover_Bracket.FCStd
(22.69 KiB) Downloaded 13 times
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Shalmeneser
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Joined: Wed Dec 23, 2020 12:04 am
Location: Fr

Re: Sketch of sheetmetal face to position holes

Post by Shalmeneser »

You need to have something inside your body to put a sketch on it.

I do all SheetMetal directly inside the body but you can also move your last action inside the body -> BaseFeature.
Attachments
HV_Cover_Bracket_SHALM.FCStd
(27.38 KiB) Downloaded 12 times
Capture d’écran 2023-02-04 082730.jpg
Capture d’écran 2023-02-04 082730.jpg (46.36 KiB) Viewed 495 times
ozindfw
Posts: 16
Joined: Wed May 08, 2019 3:19 pm

Re: Sketch of sheetmetal face to position holes

Post by ozindfw »

Clearly there is something about FreeCAD states I do not understand.
Screenshot 2023-02-04 094606.png
Screenshot 2023-02-04 094606.png (125.8 KiB) Viewed 429 times
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papyblaise
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Location: France

Re: Sketch of sheetmetal face to position holes

Post by papyblaise »

2 options:
1st: you start with a body, do the 1st sketch in this body, the basebend in the body (with the Sheemetal workshop and the 2 bends
then the hole and pocket sketch
2nd: you introduce your bar angle in the body as a base feature
Note: you can do the 2 bends in the same operation if they are identical and in the same direction
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onekk
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Re: Sketch of sheetmetal face to position holes

Post by onekk »

ozindfw wrote: Sat Feb 04, 2023 3:48 pm Clearly there is something about FreeCAD states I do not understand.

What you have Bend001 that are in the Body tree.

In this sense FreeCAD is telling you this.

You could not sketch on this, also You could not sketch on a face, due to the TNP:

TNP Problem
https://wiki.freecadweb.org/Topological_naming_problem

TNP mitigation
https://wiki.freecadweb.org/Feature_edi ... ble_models

You could subtract something (make a hole) from a solid if the solid is existing, the body is empty so "no solid" were the Feature could work on:

See maybe:

3D modelling link and paradigm explained
https://forum.freecadweb.org/viewtopic.php?f=8&t=47493

Part Design WB
https://wiki.freecadweb.org/PartDesign_Workbench

Part Design "feature driven design" concepts
https://wiki.freecadweb.org/Feature_editing

Basic Attachment Tutorial
https://wiki.freecadweb.org/Basic_Attachment_Tutorial

Sketcher constraints
https://wiki.freecadweb.org/Sketcher_scripting

Expressions
https://wiki.freecadweb.org/Expressions

Hoping that will help you to guess something useful.

Regards

Carlo D.
GitHub page: https://github.com/onekk/freecad-doc.
- In deep articles on FreeCAD.
- Learning how to model with scripting.
- Various other stuffs.

Blog: https://okkmkblog.wordpress.com/
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Shalmeneser
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Re: Sketch of sheetmetal face to position holes

Post by Shalmeneser »

:idea:
Attachments
HV_Cover_Bracket_SHALM2.FCStd
(35.22 KiB) Downloaded 9 times
Capture d’écran 2023-02-04 185319.jpg
Capture d’écran 2023-02-04 185319.jpg (31.39 KiB) Viewed 354 times
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