Problems with circular array. Features not appearing in all instances.

[gnrnr]

Hi all,

Been a while since I've haunted this place and it's good to see the regulars are still here.

I'm having a probelm with a circular pattern. The pattern is of a shallow slot with 4 instances. The edges of the shallow slot are radiused at the bottom. On the two instances which are at 90 degrees to the oringinal features, one of the radii does not show up. I can manually add radii to these features, but I suspect i shouldn't need to 🙂

As it has been a whilesince I've played with the software, can someone please have a look at the attached file to see if I've done something wrong, or is this a "new feature" 🙂

Regards


Steve

[Anonymous]

Expand th ecircular pattern dialog and try the other options..
See attached.

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[gnrnr]

Thanks Dennis.

Now for the biggy, Why does that work? I also noticed that optimised was greyed out for me.

Regards


Steve Edited by: sstrik on Mar 5, 2009 4:52 AM

[Anonymous]

Possibly there is a slight difference in the face geometry.
Which one worked for you? Can you post the part, zipped?

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Dennis Jeffrey, Autodesk Inventor Certified
Expert
Autodesk Manufacturing Implementation Certified
Expert.
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AIP 2008 SP2, AIP 2009-SP1
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HP zv5000  AMD64 2GB - Geforce Go 440, Driver: .8185
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[gnrnr]

I selected adjust to model.

Then all fillets appear correctly.

[JDMather]

Have you gone through this document http://home.pct.edu/~jmather/AU2007/MA105-1L%20Mather.pdf

When you do a pattern cut Inventor tries to cut the same volume as was cut in the seed to save calculation speed. If a different volume must be cut you must tell Inventor to Adjust to the geometry.

[gnrnr]

Thanks for that JD. That is an excellent learning aid. I haven't used Inventor much for a year, so many of the newer features and nuances have gone past me. We also only installed 2009 in January this year after skipping 2008 completely.

What i didn't get with my issue is that the cut "should" have been the same volume for each instance. The part was a revolve, with the circular pattern using the axis of revolution as its base. They may need to look at the tolerance used for the volume calc in this instance as it should have been identical. None of the patterned features intersected one another.

Thankfully it was only a user error and therefore easy to fix.

Regards

Steve

[Anonymous]

Mine did not have those issues. I don't use revolves as a
matter of practice unless the feature requires it.

--
Dennis Jeffrey, Autodesk Inventor Certified
Expert
Autodesk Manufacturing Implementation Certified
Expert.
Instructor/Author/Sr. App Engr.
AIP 2008 SP2, AIP 2009-SP1
PcCillin AV
HP zv5000  AMD64 2GB - Geforce Go 440, Driver: .8185
XP
Pro SP3, Windows XP Silver Theme

href="http://teknigroup.com">http://teknigroup.com

[gnrnr]

Dennis,

Does it cause any issues if you take a slice out of the face, rather than punch a hole through like in my sample file?

I used a revolve as I thought it might be easier to create the profile I needed using a single feature, rather than an extrusion and other features to build up the profile. Would you have modelled this part differently?

Regards


Steve

[JDMather]

>What i didn't get with my issue is that the cut "should" have been the same volume for each instance.

I hadn't opened the file - looks like it should have worked without Adjust.

[gnrnr]

That's what confused me when it initially didn't work.

Thanks for the time JD.

Regards

Steve