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Just CANNOT fully define a simple 3D sketch........

Question asked by Dave Bear on May 27, 2017
Latest reply on May 28, 2017 by Dave Bear

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Hi all,

I really don't know what has happened here. I created this part late last year and recently went to modify it when I realised that some of the sketches were not fully defined (Part of the learning curve). I have tried and tried but cannot seem to fully define the 3D sketch of 'Loft 1' and it's driving me crazy because I know it's going to be something simple!

So in further investigation, I started to look at other parts that were created back in the latter part of 2016 and found that so many of my parts were undefined and some had no dimensions at all! The only thing I can think of is that in between the creation of these parts and this current day is that I had a major computer crash and had to re-install SW and with that I totally changed all of my templates. But would this have any affect?

Anyway, my part is attached and if someone could help with resolving the 3D sketch in 'Loft 1' I'd be grateful. I have removed all of the centrelines and dimension attempts that I have tried.

Regards, Dave.

Dave Bear May 28, 2017 12:18 AM

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Hi Dennis,

Thank you for looking at this and for resolving the issue.

I'm a little confused still though. I have amended sketch3 as suggested and then and then in 3DSketch1 I have added the necessary centrelines like you have and then added the same dimensions. As I added the 200mm dimension my circles did move out a little. You are correct in stating that I want my circles on the end of the line and this is where I am having trouble now as I can't seem to figure out an actual end point relation. That is to say that when I try to add a relation, there are no options! (Tangent, coincident or otherwise).

It would also appear that somehow you have created a plane within a 3D sketch without exiting the sketch, is this what you are saying? If so, I am certainly not familiar with that technique lol.

Dave.

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G8 - Exhaust Bottom (Right).zip739.1 KB

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Dennis Bacon May 27, 2017 10:53 AM

Dave,,, I added a dim (200) on sketch 3. Then in 3DSketch1 put the circle centers coincident to the end of the Sketch3 end point. I assumed you wanted your circles on the end. You do have a coincident relation to the line, but not it's end point. Then I added a 3Dsketch plane perpendicular to the line at the end. Made on plane relations with the circles. This seemed to do the trick.

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Dave Bear @ Dennis Bacon on May 28, 2017 12:18 AM

Hi Dennis,

Thank you for looking at this and for resolving the issue.

It would also appear that somehow you have created a plane within a 3D sketch without exiting the sketch, is this what you are saying? If so, I am certainly not familiar with that technique lol.

Dave.

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Dennis Bacon @ Dave Bear on May 28, 2017 7:19 AM

I didn't add a centerline. I did add the dimension to your existing centerline on sketch3. Just seemed to me that you wanted the circles on the end of that line. Like I said you did have a coincident relation on both of the circles to the line but not the end point. Yes I did add the 3d plane on the fly while editing 3DSketch1. Don't really need a plane to fully define it. You can use other things like centerlines on z or y from the end point to the edge of the circles but if 3d sketches are flat circles why not put them on a plane. As a mater of fact it looks like you could have made a plane parallel to the right plane and used a 2d sketch for the circles. If you did indeed want to be able to manipulate 3DSketch1 and didn't want it perpendicular to the centerline then you can delete the perp relation and use something else like dims or angle relations to the 3d plane. Since I don;t actually know your design intent I simply guessed. I do remember doing a tutorial many years ago which used the 3d plane on the fly and that kind of stuck with me. It can come in really handy and makes perfect sense. You ought to fiddle with that some.

Example of manipulating 3d sketch plane (without the perp relation)

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G8 - Exhaust Bottom (Right)_db.SLDPRT.zip752.0 KB

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Dave Bear @ Dennis Bacon on May 28, 2017 7:27 AM

Cheers Dennis,

So very much appreciated!

Dave.

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Dennis Bacon May 27, 2017 10:53 AM
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Dave,,, I added a dim (200) on sketch 3. Then in 3DSketch1 put the circle centers coincident to the end of the Sketch3 end point. I assumed you wanted your circles on the end. You do have a coincident relation to the line, but not it's end point. Then I added a 3Dsketch plane perpendicular to the line at the end. Made on plane relations with the circles. This seemed to do the trick.
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- Dave Bear @ Dennis Bacon on May 28, 2017 12:18 AM
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  Hi Dennis,
  Thank you for looking at this and for resolving the issue.
  I'm a little confused still though. I have amended sketch3 as suggested and then and then in 3DSketch1 I have added the necessary centrelines like you have and then added the same dimensions. As I added the 200mm dimension my circles did move out a little. You are correct in stating that I want my circles on the end of the line and this is where I am having trouble now as I can't seem to figure out an actual end point relation. That is to say that when I try to add a relation, there are no options! (Tangent, coincident or otherwise).
  
  It would also appear that somehow you have created a plane within a 3D sketch without exiting the sketch, is this what you are saying? If so, I am certainly not familiar with that technique lol.
  
  Dave.
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  - Dennis Bacon @ Dave Bear on May 28, 2017 7:19 AM
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    I didn't add a centerline. I did add the dimension to your existing centerline on sketch3. Just seemed to me that you wanted the circles on the end of that line. Like I said you did have a coincident relation on both of the circles to the line but not the end point. Yes I did add the 3d plane on the fly while editing 3DSketch1. Don't really need a plane to fully define it. You can use other things like centerlines on z or y from the end point to the edge of the circles but if 3d sketches are flat circles why not put them on a plane. As a mater of fact it looks like you could have made a plane parallel to the right plane and used a 2d sketch for the circles. If you did indeed want to be able to manipulate 3DSketch1 and didn't want it perpendicular to the centerline then you can delete the perp relation and use something else like dims or angle relations to the 3d plane. Since I don;t actually know your design intent I simply guessed. I do remember doing a tutorial many years ago which used the 3d plane on the fly and that kind of stuck with me. It can come in really handy and makes perfect sense. You ought to fiddle with that some.
    
    Example of manipulating 3d sketch plane (without the perp relation)
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    G8 - Exhaust Bottom (Right)_db.SLDPRT.zip752.0 KB
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    - Dave Bear @ Dennis Bacon on May 28, 2017 7:27 AM
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      Cheers Dennis,
      So very much appreciated!
      
      Dave.
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Just CANNOT fully define a simple 3D sketch........

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