Hi mike,

> Tthink my problem is, that I cannot delete the original
> revolve curve.
> When I try this, the object gets also deleted. Even when
> I disable history before.

I think that I led you down the wrong path with the history stuff - that doesn't seem to be what you were running into, I just didn't understand initially what you were running into just from the first text description.

But not being able to delete the original revolve curve is a kind of unusual problem - can you please post the 3DM model file with the curve in it which will not delete so I can look at it and see what you might be running into?

One thing is to make sure you have cleared selection from any other objects by clicking into an empty spot before selecting the revolve curve - if you had something else already selected and then clicked on to the revolve curve the selection on the other thing will still be there and it will also get deleted.

- Michael