I have a small problem with two naked edges in a model of a pulley.
I made two mounting holes in the smaller end, but unfortunately positioned them too close to the edge, and they broke through into the pulley faces.
I have tried to delete the holes. One went without a problem, the other went apart from the breakthrough on the surface. This has left two naked edges which I don't seem to be able to delete - and I can't figure out why.
I suspect its because the pulley was created by revolving a curve, and one of the holes appeared at the point where the surface joins.
I attach the model. Could someone explain what I did wrong, how to delete the two naked edges, and remake the pulley into a solid.

Thanks

Make an iso curve somewhere on your surface
Kill the surface
Make a Sweep with the iso curve and a Circular existing Rail
Kill the iso curve
Join or Boolean ALL
You have a unic Solid
et voila :)
PS Of course if you want aligned surfaces just rotate it before Join All
And if you need a hole just Boolean Dif with a Cylinder

Thanks. That did it. Still not sure why an (apparently) identical hole on the opposite side deleted without trouble.

Hi wisty,

re:
> Thanks. That did it. Still not sure why an (apparently) identical hole on the opposite side deleted without trouble.

It's because the hole on the other side did not go through the "seam edge" of the closed surface:


Currently to do an "untrim" and delete a trim boundary you have to select all the edges belonging to the entire boundary.

To do it on this side you'll need to select the face and use Edit > Separate to break it out from the main object. Then select one edge of the hole you want to delete, then press Ctrl+A to do a "select all" which will select all edges of that surface and now you can use Delete to remove that boundary and recover the full underlying surface.

Then select the pieces and use Edit > Join to glue them back into a solid again.

I do want to improve the "untrim" function so you can remove part of a trimming boundary instead of the whole boundary but currently it only works on the whole boundary.

- Michael