Pattern around cylinder

[EricHuffman]

How to pattern around a cylinder without the parts flipping sides?

Seems easy enough...Model a cylinder. Create a radial hole by selecting outside of surface, offset 1, and angle offset. Pattern hole using angle offset. Open assembly. Assembly part to first hole (insert and orient to central axis so the reference doesn't stop rotation). Reference Pattern. Part will not pattern past 180°.

any ideas on how to fix this problem.

My goal is to have one set of patterned holes and on set of reference pattern assembly comps.

Ps...I tried using datum planes and that did not solve the problem.

Pss.I asked this question a while ago and even stumped PTC tech support. Pre CREO 2.0

Thanks,

Eric

Here are some images to help clarify.

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[TomU]

I think the insert is causing trouble. Assumptions are made between the hidden world coordinate systems in the part and assembly that cause issues when rotating past 180 degrees. By creating the placement references in the cylinder part first, the smaller pieces can be correctly assembled via pattern.

Sample files are attached (WF5)

[lsrutkowski]

When you made your holes, was it "Through All", or was it defined as "Through Next", "To Selected", or a blind depth? If it was a through all, there might be a problem with the cutout that is occurring where there is no material.

I have often had issues with patterning radially by manipulating an angle dimension. I often find that the "Axis Pattern" will not give up half-way through.

[mganzer]

In general I've found that the axial pattern option is more dependable than dimension based when creating these pattern types. Its the old case of all cylinder/circles are really two 180 degree halves. Rather than set the placement of the inserts by the cylinder surface you can dimension them from the center axis. You could also copy the two cylinder surfaces to create one new surface and reference that when assembling instead.