Noob Question: How to make a negative fillet

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chrisb
Posts: 18753
Joined: Tue Mar 17, 2015 9:14 am

Re: Noob Question: How to make a negative fillet

Postby chrisb » Mon Jul 30, 2018 6:13 pm

The problem why the fusion doesn't work is probably Cylinder007. It would be better if it was heading towards the back and not to the front where it creates an ever so small surface defect.

I removed Cylinder011, it is identical to Cylinder.
I removed Cylinder002, it serves nothing concerned with the issue discussed here.
Because it is best to apply fillets last I removed them. At least two of them could be done in one fillet anyway.

Now the fillet succeeds, but the radius cannot be as desired. A variable radius is not possible either, because the fillet runs around the whole ellipsoid.
Bildschirmfoto 2018-07-30 um 19.56.30.png
Bildschirmfoto 2018-07-30 um 19.56.30.png (57.81 KiB) Viewed 125 times
To prevent the latter I cut the whole thing in half. Since the cut shows that Ellipsoid003 seems to be unnecessary. I deleted Cut006 with its contents.
I could add a fillet, mirrored it and it looks not too bad:
Bildschirmfoto 2018-07-30 um 20.09.34.png
Bildschirmfoto 2018-07-30 um 20.09.34.png (22.21 KiB) Viewed 125 times
To finish the model, the mirror should be removed, the missing fillets should be added and then the mirror can be created again.
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scottdmills71
Posts: 9
Joined: Wed Jul 04, 2018 6:57 pm

Re: Noob Question: How to make a negative fillet

Postby scottdmills71 » Thu Aug 02, 2018 11:27 pm

ahh the fillet did work the way i wanted, thank you.
chrisb
Posts: 18753
Joined: Tue Mar 17, 2015 9:14 am

Re: Noob Question: How to make a negative fillet

Postby chrisb » Fri Aug 03, 2018 5:04 am

scottdmills71 wrote:
Thu Aug 02, 2018 11:27 pm
ahh the fillet did work the way i wanted, thank you.
You're welcome. I hardly use the variable radius fillets, so it was an interesting reminder.
jmaustpc
Posts: 9566
Joined: Tue Jul 26, 2011 6:28 am
Location: Australia

Re: Noob Question: How to make a negative fillet

Postby jmaustpc » Fri Aug 03, 2018 8:19 am

chrisb wrote:
Mon Jul 30, 2018 5:42 pm
TheMarkster wrote:
Mon Jul 30, 2018 4:53 pm
Seems odd a geometric primitive would have issues.
That is a known bug of the CheckGeometry tool. FreeCAD can't do anything about it, because the geometry check comes from the OCC kernel.
Hi guys, just wondered if the problem still exists in occ7.3? Likely does, I suppose.