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Linear Sketch Pattern

Question asked by Joel Hoksbergen on Aug 7, 2008
Latest reply on Aug 12, 2008 by Jerry Steiger

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When placing a linear sketch pattern (or circular), why are the patterned entity positions still floating after specifying the spacing and with the base entity position fully dimensioned?? For example (see graphic), I have placed a point in the hole wizard with it's position defined. I want this hole position to be patterned so I use a linear sketch pattern, defining the number of instances and spacing in both directions. In my mind, this should mean that all the positions of the pattern are fixed, but I can still drag the pattern around?!?! So I need to add additional dimensions/constraints, which can potentially change my pattern definition. I can think of no reason why the pattern should work this way! I don't want there to be an opportunity to inadvertantly tweak the pattern some. If I wanted to adjust the pattern I would just right click and 'Edit Linear Pattern'.

Am I missing something??

Joel

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Matt Lombard Aug 7, 2008 9:11 PM

Feature patterns are preferred over sketch patterns. They rebuild faster and make more sense. I see, maybe you're trying to do a sketch driven pattern. Still, I'd skip the sketch and just do a linear feature pattern.

When using a sketch pattern, you have to select both of the "Add dimensions" boxes, plus the "add angle dim" or whatever it says. Without those dimensions, it's just a floating underdefined pattern.

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Joel Hoksbergen @ Matt Lombard on Aug 7, 2008 9:24 PM

I agree that SW feature patterns are far better, and this is how I normally do it because I can never get the pattern to do what my mind wants it to do!! Sometimes it is convenient to pattern in the sketch (at least it was when I used Inventor).

I tried the add dimensions and angle and I found that with these checked the pattern remains square with the positions space defined, but the whole pattern is still free to spin about the base entity. So the pattern requires additional constraints which makes no sense to me.

Thanks,
Joel

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Matt Lombard @ Joel Hoksbergen on Aug 7, 2008 9:28 PM

Add a horizontal or vertical relation to one of the construction lines.

Really, for this one you can use a feature pattern.

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Sven-Erik Nilsson @ Matt Lombard on Aug 8, 2008 4:47 AM

For Sketch pattern I use to use the Automatic Relations command to make it fully constrained.
In most cases are there very few dimensions needed to do the job.

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AutoRel.jpg112.9 KB

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Jerry Steiger Aug 12, 2008 11:26 PM

Joel,

Sketch patterns suck. Matt and Sven-Erik are apparently too nice to say something like that, although Matt isn't known for biting his tongue. Why it is so clumsy is one of the mysteries of SW. In those rare cases when I have felt compelled to use them, I have had to go through the same silly pattern of giving SW all the information it needs, then giving it the same information again with sketch dimensions and relations. I think Sven-Erik came up with the best solution.

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Matt Lombard Aug 7, 2008 9:11 PM
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Feature patterns are preferred over sketch patterns. They rebuild faster and make more sense. I see, maybe you're trying to do a sketch driven pattern. Still, I'd skip the sketch and just do a linear feature pattern.

When using a sketch pattern, you have to select both of the "Add dimensions" boxes, plus the "add angle dim" or whatever it says. Without those dimensions, it's just a floating underdefined pattern.
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- Joel Hoksbergen @ Matt Lombard on Aug 7, 2008 9:24 PM
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  I agree that SW feature patterns are far better, and this is how I normally do it because I can never get the pattern to do what my mind wants it to do!! Sometimes it is convenient to pattern in the sketch (at least it was when I used Inventor).
  
  I tried the add dimensions and angle and I found that with these checked the pattern remains square with the positions space defined, but the whole pattern is still free to spin about the base entity. So the pattern requires additional constraints which makes no sense to me.
  
  Thanks,
  Joel
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  - Matt Lombard @ Joel Hoksbergen on Aug 7, 2008 9:28 PM
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    Add a horizontal or vertical relation to one of the construction lines.
    
    Really, for this one you can use a feature pattern.
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    - Sven-Erik Nilsson @ Matt Lombard on Aug 8, 2008 4:47 AM
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      For Sketch pattern I use to use the Automatic Relations command to make it fully constrained.
      In most cases are there very few dimensions needed to do the job.
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      AutoRel.jpg112.9 KB
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Jerry Steiger Aug 12, 2008 11:26 PM
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Joel,

Sketch patterns suck. Matt and Sven-Erik are apparently too nice to say something like that, although Matt isn't known for biting his tongue. Why it is so clumsy is one of the mysteries of SW. In those rare cases when I have felt compelled to use them, I have had to go through the same silly pattern of giving SW all the information it needs, then giving it the same information again with sketch dimensions and relations. I think Sven-Erik came up with the best solution.
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Linear Sketch Pattern

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