0.2 inch rad chamfer fails to make a circle tan to circle shape

Hi,
V5
recreating an end cap of brass.
I have established its as per the profile created when sectioned perp to a facet.

ALL are 0.2 inch rad circles, two are tan to each other with quad at the start of the entire shape, at aft edge of the item.

so then with the disc and hexagon I union them then apply chamferEdge 0.2 rad, and a mess occurs.

what is best way to form this ?

Not sure chamfer can establish that circle tan circle part.

chamfer 0pnt2 fails match theory.3dm (352.6 KB)

Cheers

Steve

Create the blue surface by placing the R0.2 arc at the quad point and do revolve surface.
Then create the fillets on the green part alone.
Then manually create the red fillet surfaces.

Trim and join everything:

Hi,
Looks good.
understand steps 1 and 2,
any reason the green goes out the back, does this have a role to play in the process ?

You say manually create the red fillet surfaces, do you mean use the fillet tool or some other manual method, I think manual means not a command as such.
Please explain that bit.

Cheers
Steve

not really, it’s just a way of see things, short surfaces might make the fillet algorithm fails if there is not enough room… It probably would have worked without doing so.


Because the blue surface doesn’t reach the green polysurface with a continuous edge, Fillet edges command wouldn’t work.
2025-03-18 12_30_27-
(Actually, you can tweak this by extending the blue surface with Type=Line and bypass this problem…)

So with “manually” I just meant
2025-03-18 12_30_38-

Hi,
Step 1 and 2 done,
I presumed the blue had to be a solid so I capped the back face and the front disc and joined to get a solid.
then Fillet Surface allows me to pick just one face of green, then I have to pick the other face, (blue) and nothing good happens.
I have never understood this tool, for such as this, one needs to pick ALL the green faces then pick ALL the blue. i.e be allowed to pick the blue solid, not just part of it, because the fillet goes across the arced area AND the flat front area, so one needs to feed it both those ! Why the heck does it only allow one part to be picked of the green and one part of the blue ?

Fillet Surface command just seems stupid to me. I have never ever managed to get it to work.

as it is I fail.

chamfer 0pnt2 fails match theory2.3dm (413.1 KB)



I try boolean union and filletEdge and looks promising, I can select all the edges but then useless result, why can’t it wander round the edge, (ball bearing option !) always seems obsessed with straight lines fillets. and this in V8 which I had hoped had solved the fillet edge problems, alas not. :rage:


chamfer 0pnt2 fails match theory2.3dm (413.1 KB)

Steve

remove the “Trim” and “Extend” options

Here using Fillet Edge command:

1 minute of work

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And here the way with Fillet Surface and later trimming:

Duplicate topic. please merge.

Another mute video where you can see the difference between:

  • “manually” doing Fillet Surfaces > trimming > joining
  • creating continuous surfaces with “Merge surfaces” command where the Fillet Edge will not fail.

Hi Guys,
Thanks for the replies will follow carefully and make notes in my ‘methods I am finding useful’ word doc !
see how to overcome inability to select more than one surface each part etc.

@martinsiegrist

I felt a post on just the ballbearing function would be of use to all if all saw it, but if buried in this thread where few would look for such, it would be a lost chance for them.
If I were that person I wouldnt think to look in this thread for suuch.
On that reason, can I keep it separate pleeeeze :upside_down_face:

Steve

I’m just a bit confused. I thought you’ve been using Rhino since V5 so that must be years and yet it seems you’re not aware of the rolling ball option in the fillet command…

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Hi,
I had assumed some sort of function like a rolling ball occurred by default, but with my attempts failing, clearly not.
Looking through the fillet options, i see no rolling ball in the initial stages.

However I now see it at this stage. in rail Type which appears third stage in.

My method failed as I had gone with defaults trim yes extend yes.
trying again with those OFF and the two objects unioned, rollingBall IN it then all works.

Riccardo..
@maje90
Most indebted to those three videos, they fit my ideal response, nothing like a video to see how its done as well as learn from users workflow, I use dropdown lists more than the tool icons, and ctrl j fir join not an icon, but for showing things icons are better unless you have a screen capture that puts up keyb’d usage.
I played them through at 0.25 speed to see exactly where the mouse went and what was selected.
I hope other users find this useful, we have three vids to now follow as well, again THANK YOU for those.

I also learnt that one can union a solid object and one with a hole in it !

That display with the black lines showing structure , can you let me know of that as its useful to see things that way at times, I have shaded view set up for realworld appearance, and not sure now how to get that as an option, is there a quick way of toggling that structure view on and off from my shaded mode ?

Steve

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“Rolling ball” option is in “Fillet Surfaces” or “Fillet Edge” commands, but not in “Fillet” , which is just for 2D curves.


I’m not sure what you mean with that … the isocurves maybe?

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Hi, this mode.

Cheers

Steve

those space mouse movements are smooth makes me want to buy one :joy:

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In Rhino8 you can use the script found here and in less than a second after you make two clicks it will give you this result.

I don’t understand why you use Booleans and FilletEdge that si often end up taking you hours or even days and you never learn that its a huge waste of time.

Do it! Yesterday!

Sometime I try to ask for new features with the 3dconnexion (and McNeel staff remember me us that they do not develop the plugin for it) , like move/orienting objects with the 3d mouse…
… but at the same time I fear they might break something if they touch it… current implementation is flawless!
(not on mac, where if the camera is upside-down the rotation direction left-right is inverted … very bothersome)

Hi Steve -

Go to Rhino Options -> View -> Display Modes. Select your Shaded mode in the list of display modes on the right and click the Copy button at the bottom. Give it a sensible name. Then go into the original Shaded mode and restore the defaults.
-wim

Man when these spacemice where first introduced I told myself “IM GONA BUY ONE” almost a decade later:

Nope…:joy:

1 Like