small change leading to edge mixed up

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Bozarre
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Joined: Sat Sep 14, 2019 1:38 am

small change leading to edge mixed up

Post by Bozarre »

Hi,

I'm using FreeCAD for a while now and I often have this issue: I'm editing a body and I want to change something in the previous stack of features, like adding or removing a hole in the sketch of a pocket. When I apply the change many of the next features are broken, the Edge names changed.
I understand that changing a feature can change the geometry a lot, but many time the change is so independent to the rest I don't understand why the other features are affected. I think the software should know when an edge is same as before the change.
https://imgur.com/RTaZwD0
Source file :
HexBitsBoxCapLight.FCStd
(803.03 KiB) Downloaded 15 times
I want to remove the last "diagonal round pockets", if I do almost every features has to be redone
In this example the fillet is done on another pocket which is not affected by the change, but the edges references gets broken anyway.

Am I doing it wrong ? Is there a way to avoid this ?
Last edited by Bozarre on Sat Oct 23, 2021 3:16 pm, edited 1 time in total.
heda
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Re: small change leading to edge mixed up

Post by heda »

Topological_naming_problem
some people have large issues with tnp, others hardly ever - it depends on what type of models you are making and how they are done
if one knows the general pitfalls, at least then it can be minimized.
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Shalmeneser
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Re: small change leading to edge mixed up

Post by Shalmeneser »

Bozarre wrote: Sat Oct 23, 2021 9:52 am Source file : https://file.io/UbuhoCmRLAPa I want to remove the last "diagonal round pockets", if I do almost every features has to be redone
https://www.file.io/deleted/
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thomas-neemann
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Re: small change leading to edge mixed up

Post by thomas-neemann »

Bozarre wrote: Sat Oct 23, 2021 9:52 am
what kind of models do you make?

3d printing, mechanical engineering, architecture, point clouds, wood construction ...?
Gruß Dipl.-Ing. (FH) Thomas Neemann

https://www.youtube.com/@thomasneemann5 ... ry=freecad
Bozarre
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Joined: Sat Sep 14, 2019 1:38 am

Re: small change leading to edge mixed up

Post by Bozarre »

Shalmeneser wrote: Sat Oct 23, 2021 11:08 am https://www.file.io/deleted/
I guess this website isn't made for sharing to multiple people ^^
I've attached the model to the 1st message (without the image which was taking most of the space)
Bozarre
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Joined: Sat Sep 14, 2019 1:38 am

Re: small change leading to edge mixed up

Post by Bozarre »

thomas-neemann wrote: Sat Oct 23, 2021 11:39 am
what kind of models do you make?

3d printing, mechanical engineering, architecture, point clouds, wood construction ...?
It's for 3D printing. It will serve as cover for my screedriver-box, the hex bits will be held upside-down by magnet in the cover (the round pockets)
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Shalmeneser
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Re: small change leading to edge mixed up

Post by Shalmeneser »

Your problem : Topological_naming_problem :twisted:
* Do not construct upon face but upon plane
** Faces can change if you modify something (suppressing / creating new face).
** Axis will neither change
*Perhaps construct with Sketcher_External if you are sure you'll never change the first sketch.

You can try to break my model. Fillets will certainly fail (they refer upon edge, so...), other step no (I hope :roll: ).
Attachments
Capture du 2021-10-23 19-16-01.png
Capture du 2021-10-23 19-16-01.png (166.61 KiB) Viewed 874 times
HexBitsBoxCapLight_SHALM.FCStd
(476.49 KiB) Downloaded 20 times
Bozarre
Posts: 10
Joined: Sat Sep 14, 2019 1:38 am

Re: small change leading to edge mixed up

Post by Bozarre »

@shalmeneser thanks for the file, indeed it seems better that way
Bozarre
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Joined: Sat Sep 14, 2019 1:38 am

Re: small change leading to edge mixed up

Post by Bozarre »

The final result:
IMG_20211023_193043_1_1.jpg
IMG_20211023_193043_1_1.jpg (187.48 KiB) Viewed 798 times
Holds my hex bits using magnets and it fits the box where i put the screwdriver handles
2021-10-23 23_46_56-VID_20211023_192954.mp4 - Lecteur multimédia VLC.jpg
2021-10-23 23_46_56-VID_20211023_192954.mp4 - Lecteur multimédia VLC.jpg (50.01 KiB) Viewed 798 times
TheMarkster
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Re: small change leading to edge mixed up

Post by TheMarkster »

I know I'm too late to the party, but there is another (not as good as remodeling, but maybe quicker and easier...) way. ParametricDefeaturing macro can remove the holes.

Usage: install the macro from the addon manager (tools menu). Select the faces of the feature you want to remove, then run the macro. If successful (it is not always successful) the feature will be removed.
Snip macro screenshot-ae6a89.png
Snip macro screenshot-ae6a89.png (115.42 KiB) Viewed 763 times
Snip macro screenshot-adc60f.png
Snip macro screenshot-adc60f.png (123.04 KiB) Viewed 763 times
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