WF2 Mechanism Weirdness

[dgschaefer]

WF2, M220

I have an assy that has a mechanism driven sup assy in it.  There are no mechanism constraints in the top level assy.  When I open the top level assy, the mechanism moves but the limits and gear connections are all wrong, so it doesn't move far enough in the one direction and too far in the other.

The sub assy consists of 3 telescoping tubes and gear components so that when the center tube is dragged, the intermediate tube moves at half the speed of the center tube, relative to the outer tube.  I have limits set on the mechanism so that it extends fully, but only retracts partially.  When I open that assy on it's own and drag it, it works just fine, the intermediate tube tracks perfectly.

When open the top level, however, and try to drag it, the limits are messed up.  Actually, it looks like only the intermediate tube is moving with respect to the outer, the center is staying constant to the intermediate.  If I open the sub assy, I find that the relative positions of the three tubes is off.  It's as if the gear connection have been broken.

If, however, I simply open the sub assy first, no regen or dragging required, then close it before opening the top level assy, all is good.

It's maddening, because if I fail to open the sub assy first, then drag the top level, I've messed up the telescope.  I can't save it or it'll get saved in this state.  I have to erase everything and open it again.

Anyone seen this or have a fix?

Doug Schaefer

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