Fillets and old iron

Have some feature requests, feedback, cool stuff to share, or want to know where FreeCAD is going? This is the place.
Forum rules
Be nice to others! Read the FreeCAD code of conduct!
User avatar
tanderson69
Posts: 1531
Joined: Thu Feb 18, 2010 1:07 am

Re: Fillets and old iron

Postby tanderson69 » Sun Feb 23, 2020 1:40 pm

user1234 wrote:
Sun Feb 23, 2020 11:59 am
Just for testing. Works without problems here (PartDesign). But i was expecting errors on the corner (like other CADs) so i the way i model it was a little different (like i do when i see corners like that).
Oh sure, just move the base chamfer away from the problem area ;) It is not specified on the drawing so I guess it is legal. Nice model.
Attachments
user1234.png
user1234.png (201.3 KiB) Viewed 164 times
drmacro
Posts: 786
Joined: Sun Mar 02, 2014 4:35 pm

Re: Fillets and old iron

Postby drmacro » Sun Feb 23, 2020 2:43 pm

Agreed, nice.

But, the fillets are not as specified either... .118 vs. .125

One interesting thing is the use of pads for the flange instead of a revolve. Which appears to allow the engine to handle fillets somewhat better.
User avatar
tanderson69
Posts: 1531
Joined: Thu Feb 18, 2010 1:07 am

Re: Fillets and old iron

Postby tanderson69 » Sun Feb 23, 2020 3:10 pm

drmacro wrote:
Sun Feb 23, 2020 2:43 pm
But, the fillets are not as specified either... .118 vs. .125
Yup, I missed that.

drmacro wrote:
Sun Feb 23, 2020 2:43 pm
One interesting thing is the use of pads for the flange instead of a revolve. Which appears to allow the engine to handle fillets somewhat better.
Can you determine the type of surface output by the revolve? 'planar' 'surface of revolution' etc... That might be a clue on why things fail or succeed.
user1234
Posts: 238
Joined: Mon Jul 11, 2016 5:08 pm

Re: Fillets and old iron

Postby user1234 » Sun Feb 23, 2020 5:39 pm

tanderson69 wrote:
Sun Feb 23, 2020 1:40 pm
Oh sure, just move the base chamfer away from the problem area.
I mean the transistion between the straight edge and the big diameter with two radius. But it also works good. I remodel the part. i deleted some mirror bores, else the file is to big.

br
user

done with:

Code: Select all

OS: Debian GNU/Linux 10 (buster) (X-Cinnamon/lightdm-xsession)
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.19.19703 (Git)
Build type: Release
Branch: master
Hash: 6ffef47ee83c7d5bf0e5ad24fde4a869323c7fc7
Python version: 3.7.3
Qt version: 5.11.3
Coin version: 4.0.0a
OCC version: 7.4.0
Locale: English/UnitedStates (en_US)
Attachments
test.FCStd
(976.61 KiB) Downloaded 2 times
Screenshot.png
Screenshot.png (55.37 KiB) Viewed 145 times
user1234
Posts: 238
Joined: Mon Jul 11, 2016 5:08 pm

Re: Fillets and old iron

Postby user1234 » Sun Feb 23, 2020 5:48 pm

I mean the other problem zone can done also with an exact straight transition with fillets.
Screenshot2.png
Screenshot2.png (38.65 KiB) Viewed 141 times
Screenshot1.png
Screenshot1.png (19.01 KiB) Viewed 141 times
User avatar
tanderson69
Posts: 1531
Joined: Thu Feb 18, 2010 1:07 am

Re: Fillets and old iron

Postby tanderson69 » Sun Feb 23, 2020 8:07 pm

user1234 wrote:
Sun Feb 23, 2020 5:48 pm
I mean the other problem zone can done also with an exact straight transition with fillets.
That looks close to picture, which is all you can do without proper dimensions. Nice.
drmacro
Posts: 786
Joined: Sun Mar 02, 2014 4:35 pm

Re: Fillets and old iron

Postby drmacro » Mon Feb 24, 2020 8:53 pm

tanderson69 wrote:
Sun Feb 23, 2020 8:07 pm
user1234 wrote:
Sun Feb 23, 2020 5:48 pm
I mean the other problem zone can done also with an exact straight transition with fillets.
That looks close to picture, which is all you can do without proper dimensions. Nice.
Yes, some of the exercises in this text leave a bit to the imagination. I'd love to have the teachers version or the exercise answer supplement.