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Strange behavior in assembly linear pattern
Cris_Bowers
Member Posts: 281 PRO
I was looking at an IR request for a centered option for an assembly linear pattern. I thought this was possible by just selecting opposing directions to pattern in. But when I tried it, I got unexpected results:
First by patterning a part with 2 instances in either direction, I end up with 3 instances in the patterned feature with an instance being recreated at the seed part location.
Next I tried 3 in one direction and 2 in the other. This time I end up with 5 instances in the pattern. 1 extra instance at the seed part location and another at the part above it.
And finally I tried 3 instances in each direction and ended up with 8 instances in the pattern. Numbering the part positions in the graphical area from top to bottom as 1-6, the items listed from top to bottom in the tree are position 2, 4, 3, 1, 2, 6, 5, 3. As you can see the parts at position 2 and 3 have been repeated.
It only gets compounded if you choose a 3rd direction. I chose to pattern 2 instances away from from the face of the extrusion. If I counted the parts on my screen I only see 10, but 17 parts were listed in the tree. Solidworks gets around this strange behavior by adding an option and even throws up a warning to select "pattern seed only". This option ignores the rest of the instances in the pattern and only patterns the seed feature. So if I choose to pattern 2 instances north and 2 instances south, I would have 2 instances in the pattern, one above the seed and one below.
First by patterning a part with 2 instances in either direction, I end up with 3 instances in the patterned feature with an instance being recreated at the seed part location.
Next I tried 3 in one direction and 2 in the other. This time I end up with 5 instances in the pattern. 1 extra instance at the seed part location and another at the part above it.
And finally I tried 3 instances in each direction and ended up with 8 instances in the pattern. Numbering the part positions in the graphical area from top to bottom as 1-6, the items listed from top to bottom in the tree are position 2, 4, 3, 1, 2, 6, 5, 3. As you can see the parts at position 2 and 3 have been repeated.
It only gets compounded if you choose a 3rd direction. I chose to pattern 2 instances away from from the face of the extrusion. If I counted the parts on my screen I only see 10, but 17 parts were listed in the tree. Solidworks gets around this strange behavior by adding an option and even throws up a warning to select "pattern seed only". This option ignores the rest of the instances in the pattern and only patterns the seed feature. So if I choose to pattern 2 instances north and 2 instances south, I would have 2 instances in the pattern, one above the seed and one below.
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