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Help with three sided surfaces

7

78finn

Member
Hi there....





Can anyone help me finish this surface. I need a round surface tangent to the surface body protuding in from the right hand side. I can get my three-sided surface to finish tangent in all directions.





Please help! Going mental
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View attachment 3873
 
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Hi there...


RCG137: Thanks for trying, but you are getting the same result as I have managed to get - i.e. there is still a visable line that can be seen (would be picked up clearly if used for injection molding etc). I need to get a totaly tanegnt solution. Maybe I'm looking at this from the wring perspective....still pulling my hair out. Can any one else help???


There must be things that have this problem modeled all the time......


Some one must know.....still pulling my hair out
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hi finn


it can be done in ISDX in following manner.


click on create surface tool and then select the curvesin the following order.


View attachment 3878


take care that the first curve should be oposite to degenerate vertex. (see the figure).





if still not clear


send me the part in wf2. i'll try to do it for you.
 
For starters, your curves aren't all tangent. If you want tangent surfaces then you have to make sure all the curves you're using to build them are also tangent.
 
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All serfaces are tangent!??? The two curves are either (Vertical) are normal to the planes that line tangentialy to them. The two connective curves are either: tangent / surface tangent of surface curvature.
 
Ok....here is the best I have managed to build.


Ok, here is the challenge. To build this shape to production quality - Top surface A1.


Please let me know if how you would go about building this surface and post your replys......I'm really interested to see how you all go about doing it.





Cheers then





Mikey2007-07-15_085826_shell.neu.rar
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I have a technique for building these nasty three part boundaries too. Just to explain... Once you learn the basic tools of surfacing there is so much more to learn.
Everything in surfacing is about plan of attack. Modeling technique and modeling style are what we focus on at design-engine for example. We seam to take the stress off learning the menu clicks like that of PTC is all menu clicks and we focus more on modeling style and technique with learning the clicks secondary. We found the participants learn surfacing at a much higher level this way. Something to keep in mind as you mature your skills.

For example, when intermediate to advance users come to us for training and they see this technique that I am about to illustrate the participant often realizes an epiphany. The above shape will have knots or the globing effect in the surface. This is bad form just like a racer that looks like he is going fast on the track but is not.

Ill have more time later today to build the examples.


Edited by: design-engine
 
Hi there


Roto: Can you post that part so I can have a look at it....I had tried that approach but not managed to get an even finish....hard to tell from a JPEG....if you could post the part file, that would be good.


Design Engine: I completely agree - the baisc embale simple form creation, but not true understanding. If you could post any exampls of how to handle these three sided beasties...that would be great. I'm trying to handle one at the moment for a job at work (a handle three sided surfaces at either end)....and I can't find a way of beng able to dice them up into 4 sided surfaces... Any help...well that would be great.


Thanks to both of you....
 
design-engine said:
I have a technique for building these nasty three part boundaries too. Just to explain...
Click to expand...

Do you mean the technique where you trim the end of the surface off to create 3 new edges? Then complete with a 4 sided boundary?
 
I have a tutorial for this method
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...it works, but is...shall we say a little clunky (for want of a better expression) - Seems a bit long winded and unaccurate? Is this really the only other method? Surely not?
 
Ok, heres another way of achieving a 3 sided surface (I think this is what Gristle & Design Engine were refering to), using / projected curves / trim /murged boundrysurfaces etc etc etc. Very long winded but works ok.


Here is the file: WF 2.0: 2007-07-17_002417_01._Tri_Patch.zip


Infact its very long winded, howeveryou are able to update the initial boundry curves and the resultantform seems to regenerate successfully.


But there HAS to be an easier way than this surely! Answers on a post card & thinking caps on please!!!


http://www.mcadcentral.com/proe/forum/uploads/78finn/2007-07-17_002417_01._Tri_Patch.zip
 
the steps where u make that "cutout" to generate the 4 edges. can be simplified - merged into afew less steps.

but thats the "going" method these days.

Bart would be the best person to enlighten us all tho ........ *PoKE*
 
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