Strange Chamfer behavior

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duffy55
Posts: 30
Joined: Tue Jun 26, 2018 9:00 am

Strange Chamfer behavior

Post by duffy55 »

Hello, I found a strange behavior of the chanfer function if you see in the image attacched the chanfer on the hole nr. 1 it's like I want , the chanfers in the holes 2,3 and 4 have a different form, the chanfer parameters used are the same, but the result are different.
Please let me know if I am making some mistakes
Thank you
Regards
plate.jpg
plate.jpg (35.21 KiB) Viewed 1899 times
Below my system info
OS: Windows 10 Version 2009
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.19.24267 +99 (Git)
Build type: Release
Branch: Branch_0.19.3
Hash: 6530e364184ce05ccff39501e175cf2237e6ee4b
Python version: 3.8.6+
Qt version: 5.15.2
Coin version: 4.0.1
OCC version: 7.5.3
Locale: C/Default (C)

used chanfer parameters
Attachments
chanfer.jpg
chanfer.jpg (30.99 KiB) Viewed 1899 times
Last edited by Kunda1 on Fri Jan 28, 2022 12:23 am, edited 1 time in total.
Reason: fixed typo in thread title
chrisb
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Re: Strange Chanfer behavior

Post by chrisb »

I'm pretty sure that this is only a visual effect of the projection. You can validate this assumption e.g. by looking at it in one of the standard projections (top, bottom, ...) or by cutting the part in the middle of the holes thus creating a section.

There is also a section view, but it often is not appreciated, because it shows the objects hollowed.
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Shalmeneser
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Re: Strange Chanfer behavior

Post by Shalmeneser »

You can select many edges for the same size in the same chamfer.

(File ?)
wieszak17
Posts: 250
Joined: Fri Jan 10, 2014 7:59 pm

Re: Strange Chanfer behavior

Post by wieszak17 »

Do chamfer individually, then use that red/blue arrows on right side of "Type" selection to correct FC if it not guessed right between which faces should be that 55 deg.
duffy55
Posts: 30
Joined: Tue Jun 26, 2018 9:00 am

Re: Strange Chamfer behavior

Post by duffy55 »

Thank you to all, the suggestion of wieszak17 solve the issue, sorry but I didn't know the usage of the two arrows.
I remains the curiosity of why in the case of the hole 1 it works without the use of the arrows, while in the other 3 cases I had to change the direction of the chamfers.

Regards
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Shalmeneser
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Re: Strange Chamfer behavior

Post by Shalmeneser »

File ?
duffy55
Posts: 30
Joined: Tue Jun 26, 2018 9:00 am

Re: Strange Chamfer behavior

Post by duffy55 »

I loaded the file for your analysis. please let me know.
Attachments
frontalino.FCStd
(44.4 KiB) Downloaded 28 times
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Shalmeneser
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Re: Strange Chamfer behavior

Post by Shalmeneser »

* 1st sketch is too complex
* NO zero-dimension : Sketcher_ConstrainVertical
* NO twice the same dimension : Sketcher_ConstrainEqual
* logical constraining (blue line in my sketch) Sketcher_ToggleConstruction
* ONE identical chamfer operation for4 holes
Attachments
frontalino_SHALM.FCStd
(22 KiB) Downloaded 25 times
Capture d’écran 2022-01-29 153457.png
Capture d’écran 2022-01-29 153457.png (44.47 KiB) Viewed 1572 times
Capture d’écran 2022-01-29 153552.png
Capture d’écran 2022-01-29 153552.png (51.99 KiB) Viewed 1572 times
duffy55
Posts: 30
Joined: Tue Jun 26, 2018 9:00 am

Re: Strange Chamfer behavior

Post by duffy55 »

Thank you a lot,
sorry for my inexperience and for my delay replay, I was in holiday
Regards
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