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BrianBoman14-Alexandrite
14-Alexandrite
January 8, 2019
Solved

Rounding tool mysteries

  • January 8, 2019
  • 9 replies
  • 4766 views

Part - I have a skin with an orthogrid modeled onto it and I am trying to round the floor of the pockets.

 

Issue - I can fully round the entire part but only if I break up the rounding effort. There are specific pockets which are happy to solve on their own accepting a round, however, if these pockets are grouped with adjacent pockets the entire round fails.

 

All of the geometry is identical and has either been patterned or created using the same features. 

 

Any ideas what could be causing this? 

Best answer by BrianBoman

"

Topic: Rounding tool Mysteries 
Date: 01-08-2019 12:05 PM

Did it solve your problem?

Click here to view the replies and mark one as an Accepted Solution.

This helps others find helpful answers in the community too!

"

 

 

No. It did not. As a heavy Creo user I can say the state of the round tool is a burden on anyone who uses this software. I developed a technique to make heavy rounding easier (over 4000 edges), however, the round tool fails...Repeatedly. When I go into another CAD package I do not see the same issues with rounding. The solution is for PTC to make the rounding tool more robust.

9 replies

StephenW
StephenW23-Emerald III
23-Emerald III
January 8, 2019

You can almost make a career out of rounds in Creo. 

Rounds have always been very pick order sensitive. You'll be working along and you'll find a round that won't work and then when you re-pick in a different order, they work just fine.

One possibility is you could change your accuracy. Possibly from relative to absolute (if it's not already that way). Then maybe reduce the accuracy until it works. Always be careful with accuracy and save everything before adjusting it because you can get failures that are completely unexpected.

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    Patriot_1776
    Patriot_177622-Sapphire II
    22-Sapphire II
    January 9, 2019

    As Stephen mentioned rounds can be a career.  Try using "Intent Edge" and see what that does for ya.  Also, you can set up "rules" to pick.  When you pick an edge to round, pick the "Details" under the "Refernces" cell, and that allows you to do some neat things.

     

    Sometimes, you just have to group rounds the way the system forces you to.

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    BrianBoman14-AlexandriteAuthor
    14-Alexandrite
    January 9, 2019

    All good tips. I was actually using the datum reference feature combined with the find and select binoculars since with the datum reference active you gain access to the geometry selection filter. I was collecting edges based on "does not belong" and "does belong" and unfortunately the rounding tool made this much more difficult than it needed to be since the edge collection had to be done manually to an extent.

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    B
    BrianBoman14-AlexandriteAuthorAnswer
    14-Alexandrite
    January 14, 2019

    "

    Topic: Rounding tool Mysteries 
    Date: 01-08-2019 12:05 PM

    Did it solve your problem?

    Click here to view the replies and mark one as an Accepted Solution.

    This helps others find helpful answers in the community too!

    "

     

     

    No. It did not. As a heavy Creo user I can say the state of the round tool is a burden on anyone who uses this software. I developed a technique to make heavy rounding easier (over 4000 edges), however, the round tool fails...Repeatedly. When I go into another CAD package I do not see the same issues with rounding. The solution is for PTC to make the rounding tool more robust.

    Patriot_1776
    Patriot_177622-Sapphire II
    22-Sapphire II
    January 14, 2019

    Hmmm, picking 4,000 edges sounds excessive to me, it does not surprise me that it would fail.  I would tend to want to make the rounds based on other features where it makes sense (e.g. one area of the isogrid you make at one time) instead of trying to round everything at once, then simply writing a relation to make the radii equal.  That's a recipe for failure no matter how you slice it and is the LEAST robust way to do it.  For instance, one feature (e.g. a rib in the isogrid) fails, now that 4,000 entity round fails, then and rounds based on that fail.  If you did it in sections that made sense, only THAT round and the children would fail.

     

    "Isogrid" to me means NASA work, or contractor.  Before I took my current position I worked at Sierra Nevada Aerospace on the Dreamchaser.  While I never worked specifically on isogrids, the similar rounding issue I had was when I worked for Royal Appliance (Dirt Devil - late '90's) and had to work on the back panel of a vacuum cleaner (over 1,400 features - a nightmare of shapes, draft, and rounds), so, I can relate.  I found that, as I suggested, breaking the rounds up into areas that made sense made the model much more robust.

     

    Best of luck!

      B
      BrianBoman14-AlexandriteAuthor
      14-Alexandrite
      January 14, 2019

      Frank, 

       

      I appreciate your response. This is for that type of work. I did break up the rounds. However, there are edges if even grouped with 1 other edge, will not accept a round, then will accept a round if selected by itself. There are edges that will solve with rounds at .1235, but not at .124-.125, then will solve again at .126. So, I do appreciate the help this community has tried to provide but the rounding tool needs some serious work. 

       

      Thanks, 

       

      Brian

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