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better surface transition

Question asked by Mau Ferrusca on Jun 23, 2008
Latest reply on Jul 2, 2008 by 1-9C36HC

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hi guys.

i submit this file in order to ask you:

i want to create a fillet that runs on the side of this part, but since it has a draft towards the top, the automatic fillet options are not cooperating with me.

i want to be able to control the centerline of such fillet, so i can make a parting line right in the middle of it.

so far, i doubt that my sketches or my geometry for that part are useful for my purpose.

is there an easier way to create the fillet i want? i have been toying around with boundary and loft surfaces but i cannot obtain a satisfactory solution.

i was thinking that i could offset all the lenght of the corner and project it to a surface that runs exactly thru the middle of the narrow side of my part, but i don't know if this would work.

maybe my geometry is wrong or i am trying to draw something that mathematically can't exist.

what would you do?

thanx in advance!

Mau Ferrusca Jun 24, 2008 1:11 PM

Correct Answer

thank u Dwight. you've been of great help! i hadn't noticed the lack of draft, but applying it solves most of the problems. thank u indeed. most appreciated.

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squashed_fillet.zip148.9 KB
01.PNG86.5 KB

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Dwight Livingston Jun 23, 2008 7:34 PM

As far as making a fillet goes, a full round fillet will work. You have to make the edge surfaces out to the extent of the fillet, and not try to have the fillet extend beyond the edge surfaces. All four corner fillets need to be inserted before the full round fillet, and their radii must be greater than the radius of the full round fillet.

I'd show a picture but I've got a new [used] computer and haven't installed photoshop yet.

As far as the parting line goes, I am interested what others here will say. I have had difficulty doing that. You'll find that a line perpendicular both to the centerline of the fillet and to the draw will pierce the fillet surface at the parting line. I suppose that doesn't really help.

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Mau Ferrusca Jun 23, 2008 8:30 PM

You are correct, Dwight. I managed to make a fillet with the full round fillet option and it automatically propagated all around the edges.

I used my main sketch to find the mid section of the wall's thickness and i have my split line all across the sides. Let's see where I can go from here.

Thanx for your help!

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yeah.PNG115.5 KB

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Mau Ferrusca @ Mau Ferrusca on Jun 23, 2008 8:52 PM

well, the first results are not encouraging. i have to tweak this a bit.

Attachments

EX21a.zip286.1 KB
ouch.PNG83.8 KB

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Dwight Livingston @ Mau Ferrusca on Jun 24, 2008 12:09 PM

If you use the Insert / Molds / Parting Line feature, it seems to make a good parting line. I had not gone through the process before, and it took only a little thrashing to make it work.

One problem you had was a lack of draft on the cut ends. It doesn't matter for the curved section, but the straight ends need the draft. I added draft and the result looks okay. See attached.

You've got small areas of zero draft near the parting line, which is a problem for some materials, but okay for others.

Attachments

EX21_dl.zip348.5 KB

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Mau Ferrusca Jun 24, 2008 1:11 PM

thank u Dwight. you've been of great help! i hadn't noticed the lack of draft, but applying it solves most of the problems. thank u indeed. most appreciated.

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1-9C36HC @ Mau Ferrusca on Jul 2, 2008 11:18 PM

Mau,

Dwight's solution is best for what you're trying to achieve, but if you need to actually use the Boundary feature in the future, there is a solution to the problem you've observed in the Boundary feature you created. If you select "next curve" in the tangent influence checkbox on your boundary's first curve set, you'll see that it gives you the full round look you're after. These tangent influence options are powerful for this kind of stuff.

Hope this helps.

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6 Replies

Dwight Livingston Jun 23, 2008 7:34 PM
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Correct Answer
As far as making a fillet goes, a full round fillet will work. You have to make the edge surfaces out to the extent of the fillet, and not try to have the fillet extend beyond the edge surfaces. All four corner fillets need to be inserted before the full round fillet, and their radii must be greater than the radius of the full round fillet.

I'd show a picture but I've got a new [used] computer and haven't installed photoshop yet.

As far as the parting line goes, I am interested what others here will say. I have had difficulty doing that. You'll find that a line perpendicular both to the centerline of the fillet and to the draw will pierce the fillet surface at the parting line. I suppose that doesn't really help.
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Mau Ferrusca Jun 23, 2008 8:30 PM
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Correct Answer
You are correct, Dwight. I managed to make a fillet with the full round fillet option and it automatically propagated all around the edges.

I used my main sketch to find the mid section of the wall's thickness and i have my split line all across the sides. Let's see where I can go from here.

Thanx for your help!
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- yeah.PNG115.5 KB
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- Mau Ferrusca @ Mau Ferrusca on Jun 23, 2008 8:52 PM
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  well, the first results are not encouraging. i have to tweak this a bit.
  Attachments
  - EX21a.zip286.1 KB
  - ouch.PNG83.8 KB
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  - Dwight Livingston @ Mau Ferrusca on Jun 24, 2008 12:09 PM
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    If you use the Insert / Molds / Parting Line feature, it seems to make a good parting line. I had not gone through the process before, and it took only a little thrashing to make it work.
    
    One problem you had was a lack of draft on the cut ends. It doesn't matter for the curved section, but the straight ends need the draft. I added draft and the result looks okay. See attached.
    
    You've got small areas of zero draft near the parting line, which is a problem for some materials, but okay for others.
    Attachments
    EX21_dl.zip348.5 KB
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Mau Ferrusca Jun 24, 2008 1:11 PM
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thank u Dwight. you've been of great help! i hadn't noticed the lack of draft, but applying it solves most of the problems. thank u indeed. most appreciated.
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- 1-9C36HC @ Mau Ferrusca on Jul 2, 2008 11:18 PM
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  Mau,
  
  Dwight's solution is best for what you're trying to achieve, but if you need to actually use the Boundary feature in the future, there is a solution to the problem you've observed in the Boundary feature you created. If you select "next curve" in the tangent influence checkbox on your boundary's first curve set, you'll see that it gives you the full round look you're after. These tangent influence options are powerful for this kind of stuff.
  
  Hope this helps.
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