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ViaCad 2d/3d (#1348)
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unique  
#1 Posted : Sunday, July 20, 2008 5:16:41 PM(UTC)
unique

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Tim:

Im using the trial V6 (Build 786). I would like to variable fillet the edge of this shape as done in Rhino. I have placed points in the locations where I made it work. The radii was 1 - 5 - 10 - 6 - back to 1

Please tell me where im going wrong here as I can opnly use two locations with different rads at the moment ??

Cheers,
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Steve.M  
#2 Posted : Tuesday, July 22, 2008 8:48:32 AM(UTC)
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Hi Paul,

I did at first think it was a limitation, but after looking at the user manual it does state that chaining of edges can be used.

If for example you make the main body from a 2d extrusion, then the top edge (that you want to variable fillet) will remain as one continuous edge and you can add any number of variable fillet sizes. So I would say it is a possible bug (or the user manul is in error and there is a limitation and chaining cannot be used).

I would be interested to hear if the same problem is on the mac version (I know the shark(demo) gives the same error message on this)


- Steve
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jol  
#3 Posted : Tuesday, July 22, 2008 9:01:30 AM(UTC)
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It's working for me in VC 788

Our methods must differ !?
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unique  
#4 Posted : Tuesday, July 22, 2008 9:41:25 AM(UTC)
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jol wrote:
It's working for me in VC 788

Our methods must differ !?


jol

Please share your method and solid model please:)
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jol  
#5 Posted : Tuesday, July 22, 2008 9:54:33 AM(UTC)
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OK - here you go

I selected the edges that I wanted to place values on .. ie all of them around the top face (whilst pressing shift)

If you only want 2 values .. and they both live on a single edge .. then just select that one edge (.. and the tool will scoot around and find the other edges as necessary)

So, then I clicked on each vertex junction (with a preset rad value) as shown in the attached

Each junction had a value (though I dont think this is necessary)

.. I pressed ESC to compute
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jol  
#6 Posted : Tuesday, July 22, 2008 9:57:01 AM(UTC)
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um .. forgot the image
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jol  
#7 Posted : Tuesday, July 22, 2008 9:57:51 AM(UTC)
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I think it would be good if you posted your method too .. as there may well be problems that need addressing
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jol  
#8 Posted : Tuesday, July 22, 2008 10:04:30 AM(UTC)
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oops - I didn't read your post properly , sorry !
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Steve.M  
#9 Posted : Tuesday, July 22, 2008 10:11:14 AM(UTC)
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Hi Paul,

What jol is showing is a need to have continuous fillet rad around the fillet corners, which does work,, but, it is not then actually a correct variable fillet as the corner fillets are continuous. I will make example.

- Steve
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jol  
#10 Posted : Tuesday, July 22, 2008 10:22:29 AM(UTC)
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Yep .. sorry for the confusion

Tim .. we should be able to do this, no ?
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unique  
#11 Posted : Tuesday, July 22, 2008 10:25:12 AM(UTC)
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jol wrote:
oops - I didn't read your post properly , sorry !


Hi Jol,

Please post your model so I can see how you built the solid from primitive or curves......thx
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jol  
#12 Posted : Tuesday, July 22, 2008 10:31:18 AM(UTC)
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Paul .. not my model

was posted on previous page
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unique  
#13 Posted : Tuesday, July 22, 2008 12:07:27 PM(UTC)
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OK - I spent a few minutes tryin something. Look at the attached file, you can see the points positioned at the end & mid points of the top Loop. Notice the loop is not closed (not G1). I placed rads starting with 1mm at rad#1 and incrementing to r=11, this produced a fillet with no errors.

Copied another solid and filleted all corners then tried to do the same using the top loop with IS G1.......no joy

Note: I am using auto chaining in options rather than selecting individual but I have now tried both ways :(

I would expect this ACIS modeler to murder Rhino on such a simple fillet ??

I hope Tim can point me in the right directions (usually does);)
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Steve.M  
#14 Posted : Tuesday, July 22, 2008 12:34:50 PM(UTC)
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Hi Paul,

Interesting result, as it does show the ability to create variable fillet around a chain that includes the rads.

Maybe a limitation in that a closed chain cannot have a variable fillet, whereas the variable is to go around a rad?, but instead that edge needs to be continuous.
I did rebuild the test model (see my post #2) and was easily able to add a variable fillet with as many rads in whatever position I wanted due to continuous edge.


- Steve
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ttrw  
#15 Posted : Tuesday, July 22, 2008 1:23:53 PM(UTC)
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When examining Paul's model, this happened (see attached pic). This is the second time this has happened today- first with a square I drew in 2D, then extruded (when reselecting the lines in the CE, the shift out happened).

Don't know how I can get it to repeat, or fix, without re-opening the file again

:confused:
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unique  
#16 Posted : Tuesday, July 22, 2008 2:06:38 PM(UTC)
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Quote:
I did rebuild the test model (see my post #2) and was easily able to add a variable fillet with as many rads in whatever position I wanted due to continuous edge.



Hi Steve,

Yes, but I suspect when you "joined" the curves it added that weird blend curve between the line arc geometry ???
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Steve.M  
#17 Posted : Tuesday, July 22, 2008 2:12:59 PM(UTC)
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unique wrote:
Hi Steve,

Yes, but I suspect when you "joined" the curves it added that weird blend curve between the line arc geometry ???
That is on splines, and only adds them if the connection is not already G1.


The rebuild is attached:


edit:

I just noticed a limitation, in that the variable fillet cannot be bigger than the corner rad it follows (on this construction type)
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unique  
#18 Posted : Tuesday, July 22, 2008 2:53:11 PM(UTC)
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Hi Steve,

Im not sure what method you used to create the spline in VCad? but in any case I started this thread with a simple solid primitive which was filleted...If I wanted long ways round I would stick with Rhino !!:D :D

I do appreciate your input and I hope Tim can shed some light on the smatter for us...thx Steve.
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Steve.M  
#19 Posted : Tuesday, July 22, 2008 3:25:22 PM(UTC)
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Hi Paul,

unique wrote:
Im not sure what method you used to create the spline in VCad? but in any case I started this thread with a simple solid primitive which was filleted...If I wanted long ways round I would stick with Rhino !!:D :D
Yes, I agree, but was putting forward that the variable fillet worked on a continuous closed edge, and that is how I though a chained edge would work :p
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jdi000  
#20 Posted : Wednesday, July 23, 2008 8:21:43 PM(UTC)
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unique wrote:
OK - I spent a few minutes tryin something. Look at the attached file, you can see the points positioned at the end & mid points of the top Loop. Notice the loop is not closed (not G1). I placed rads starting with 1mm at rad#1 and incrementing to r=11, this produced a fillet with no errors.

Copied another solid and filleted all corners then tried to do the same using the top loop with IS G1.......no joy

Note: I am using auto chaining in options rather than selecting individual but I have now tried both ways :(

I would expect this ACIS modeler to murder Rhino on such a simple fillet ??

I hope Tim can point me in the right directions (usually does);)



Hi, Paul

I tried var. fillet with the Automatic chain select off with your values and it did not error out but only one edge filleted but what was interesting is if you look at the fillet in object info its shows a variable fillet with all 4 point but it do not fillet the other edges. I would think that this fillet should work and there must be something that keeps generating the fillet too big error when you you use auto chain or with this one not filleting all selected edges.

It would be nice to figure out what is going on.


Jason
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