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Loft/ boss problem

Question asked by Joren Claessens on Apr 4, 2020
Latest reply on Apr 6, 2020 by Mark Biasotti

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I encounter a problem when using the loft/boss feature. I am trying to design a surfboard and I need a 3D file. I have a few very specific, calculated profiles and 1 guide profile. The loft feature only calculates the first half and refuses to connect the next profile.

Does anyone knows the solution to my problem?

Do the profiles need to have the same amount of points for the loft function to work?
Do I need more profiles? (these are quite hard to calculate and I was hoping SW would do this for me)

Matt Lombard Apr 6, 2020 9:59 AM

Correct Answer

The Tail SK and the LO Back Tail End sketches both have extra sketch entities in them. Use Tools, Sketch Tools, Check Sketch For Feature to help you figure it out. The tip sketch and the guide curve are also buggered, but that's for a different reason. You have to understand the function of each sketch and sketch it correctly or use the SelectionManager to pick the correct sketch.

Here's part of the mess your approach is causing:

Your job is to get all of these lines to go straight. These are the connectors between profiles, and this is why your feature is failing.

The problem is you have so many little sketch sections. And worse, the sketch sections are little lines and arcs. I personally would use Fit Spline to put each profile together into a single spline. Very much simplifies things, and gives you a cleaner shape. Lines and arcs are really not what these shapes are all about.

See the reply in context

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Surfboard shape 3.SLDPRT.zip558.6 KB

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Krzysztof Szpakowski Apr 6, 2020 9:46 AM

Do the profiles need to have the same amount of points for the loft function to work?
Do I need more profiles? (these are quite hard to calculate and I was hoping SW would do this for me)

No. For both questions.

But if profiles need to have the same amount of points control for Loft is easier. If is other your model can look oddly. Of course is possible control in other way but beginners have a problem.

In your model, maybe you have opem profile? Ff you attach a file there will be someone who locates the reason, I don't - I have the old SW version

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Joren Claessens @ Krzysztof Szpakowski on Apr 6, 2020 10:36 AM

Thanks for your help!

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Matt Lombard Apr 6, 2020 9:59 AM

Here's part of the mess your approach is causing:

Your job is to get all of these lines to go straight. These are the connectors between profiles, and this is why your feature is failing.

Actions

Matt Lombard @ Matt Lombard on Apr 6, 2020 10:06 AM

Here's after the fix:

Also, personally, I would make the tip a single point rather than a tiny ellipse or whatever it is.Then you can set the tangency on the end and really round it off rather than whatever you're doing now.

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Joren Claessens @ Matt Lombard on Apr 6, 2020 10:45 AM

Hi Matt,

Thanks for the fix! I have been been changing, adding and switching sketches for a few hours. I believe this caused the huge mess... I am glad you were courageous enough to dive in.

I did not know about a the things you figured out and will test it immediatly.

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Mark Biasotti Apr 6, 2020 12:05 PM

Hi Joren,

The suggested solutions by Matt and Krzysztof are excellent advice. Using your existing profile sketches, you might want to consider sweeping a solid boss for your surfboard shape. If the profiles are similar and you can constraint the single profile parametrically to the path and guide curves, you will get a much higher quality result than Loft (or even Boundary - because the resultant surfaces will be conical in nature and never inflect).

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6 Replies

Krzysztof Szpakowski Apr 6, 2020 9:46 AM
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Correct Answer
Do the profiles need to have the same amount of points for the loft function to work?
Do I need more profiles? (these are quite hard to calculate and I was hoping SW would do this for me)
No. For both questions.
But if profiles need to have the same amount of points control for Loft is easier. If is other your model can look oddly. Of course is possible control in other way but beginners have a problem.
In your model, maybe you have opem profile? Ff you attach a file there will be someone who locates the reason, I don't - I have the old SW version
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- Joren Claessens @ Krzysztof Szpakowski on Apr 6, 2020 10:36 AM
  Mark Correct
  Correct Answer
  Thanks for your help!
  Like • Show 1 Like1
  Actions
Matt Lombard Apr 6, 2020 9:59 AM
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Correct Answer
The Tail SK and the LO Back Tail End sketches both have extra sketch entities in them. Use Tools, Sketch Tools, Check Sketch For Feature to help you figure it out. The tip sketch and the guide curve are also buggered, but that's for a different reason. You have to understand the function of each sketch and sketch it correctly or use the SelectionManager to pick the correct sketch.

Here's part of the mess your approach is causing:
Your job is to get all of these lines to go straight. These are the connectors between profiles, and this is why your feature is failing.

The problem is you have so many little sketch sections. And worse, the sketch sections are little lines and arcs. I personally would use Fit Spline to put each profile together into a single spline. Very much simplifies things, and gives you a cleaner shape. Lines and arcs are really not what these shapes are all about.
Like • Show 1 Like1
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- Matt Lombard @ Matt Lombard on Apr 6, 2020 10:06 AM
  Mark Correct
  Correct Answer
  Here's after the fix:
  Also, personally, I would make the tip a single point rather than a tiny ellipse or whatever it is.Then you can set the tangency on the end and really round it off rather than whatever you're doing now.
  Like • Show 2 Likes2
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- Joren Claessens @ Matt Lombard on Apr 6, 2020 10:45 AM
  Mark Correct
  Correct Answer
  Hi Matt,
  
  Thanks for the fix! I have been been changing, adding and switching sketches for a few hours. I believe this caused the huge mess... I am glad you were courageous enough to dive in.
  I did not know about a the things you figured out and will test it immediatly.
  Like • Show 1 Like1
  Actions
Mark Biasotti Apr 6, 2020 12:05 PM
Mark Correct
Correct Answer
Hi Joren,
The suggested solutions by Matt and Krzysztof are excellent advice. Using your existing profile sketches, you might want to consider sweeping a solid boss for your surfboard shape. If the profiles are similar and you can constraint the single profile parametrically to the path and guide curves, you will get a much higher quality result than Loft (or even Boundary - because the resultant surfaces will be conical in nature and never inflect).
Like • Show 1 Like1
Actions

Loft/ boss problem

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