topic Re: Circle and offset plan !!!! not in center ??? in Fusion Support Forum

Circle and offset plan !!!! not in center ???

Patrick.B1 — Tue, 01 Dec 2020 09:36:16 GMT

I really don't understand and wonder me why

as shown on pics, just do a simple cercle then another one and extrude then above you make another sketch then you can fin easily the project center point .

now add offset plan like 2 mm and sketch on it and new cercle..!! and i am not in center !! while i still have the contraint and coincident !! if i use the offset plan i have this, without it's ok !!

thanks for your expert idea , try on your pc you'll see..

Re: Circle and offset plan !!!! not in center ???

g-andresen — Tue, 01 Dec 2020 09:45:17 GMT

Hi,

1. Did you project the original geometry into the following sketch and create the coincidence towards the centre?

2. Please share the file.

File > export > save as f3d locally > attach it to the next post.

günther

Re: Circle and offset plan !!!! not in center ???

Patrick.B1 — Tue, 01 Dec 2020 11:05:16 GMT

yes exactly that why and i don't understand if you use sketch on cylinder is fine and if u use sketch on offset plan then you are not in center !!

here is the test files f3d

Re: Circle and offset plan !!!! not in center ???

g-andresen — Tue, 01 Dec 2020 13:15:20 GMT

Hi,

inspect this screenshot

günther

Re: Circle and offset plan !!!! not in center ???

Patrick.B1 — Tue, 01 Dec 2020 15:22:30 GMT

correct i did mistake on my f3d files, this one i knew it and agree that why we are on center but look now on new files and last circle

Re: Circle and offset plan !!!! not in center ???

g-andresen — Tue, 01 Dec 2020 16:55:16 GMT

Hi,

If the circle has to be concentric with the cylinder, its centre is not on the origin but on the projected centre of the cylinder.

Screencast

günther

Re: Circle and offset plan !!!! not in center ???

Patrick.B1 — Tue, 01 Dec 2020 19:01:18 GMT

ah yes on this point i agree and understand but usualy and if you don't add offset plan then you are righ tin center on origin but if you add offset plan then we have to use the project which is not right in center !!!

Re: Circle and offset plan !!!! not in center ???

Patrick.B1 — Tue, 08 Dec 2020 18:10:26 GMT

Ok sorry for my late reply .

Here i sketch 2 files, and you can see that if you draw 1 circle then extrud, then another one on this you can find the center origin it's work sure. after another one on the offset plan...and easy to fix on the origin too and contraint coincident

now test 2 same but i cut the 1st circle , and then voilà it's not possible anymore !! you have to use the contraint concentric and not the origin !!

so as i said on full circle you can do all and use orgin at each step but when you do not have a full cylinder then the origin and coincident is not working !!

hope i am clear !! sorry for my bad english...

Re: Circle and offset plan !!!! not in center ???

TheCADWhisperer — Tue, 08 Dec 2020 20:26:47 GMT

Yikes!

Another good reason to use the BORN Technique.

Offset your work plane from the Origin plane rather than from a part face.

I try to use the BORN Technique as much as possible and practical - rarely using part faces to anchor geometry unless there is not another practical way.

Re: Circle and offset plan !!!! not in center ???

Patrick.B1 — Wed, 09 Dec 2020 18:36:19 GMT

Ah yes right i test it and use the origin and look at your links utube...it's works..thx for idea and tips..

nevermind i still wonder to Autodesk ingé why i's work like this !! why on whole cylinder we can use the right center with coincident and not on cutting cylinder...:!! that a mazinggggg

Re: Circle and offset plan !!!! not in center ???

TheCADWhisperer — Wed, 09 Dec 2020 19:07:24 GMT

Ping @jeff_strater

you should take a look at this one.

Looks like a bug to me that could have a nasty bite.