After getting all that done i had a look at adjusting the shaper to minimise vibration as much as I could.
The table was lifted to reduce slide overhang and at the same time the slide was lifted up.
About 3" in all.
Then I reduced the auto feed setting to about half what it was, plenty more adjustment if need too.
Also after reading on the net about tooling reground a HSS cutter so that it was more suited for steel.
The result was very pleasing
Anyone for curls....

The finish was almost as good as emery, certainly wouldn't take much to finish by hand.
Alas the fine slotting wasn't so good, too much vibration. More do some more reading about tooling and cutting angles etc.
Two different cutters used for each slot.

The alloy wasn't quite as good, a little rough in one area. Again probably tooling angles I suspect. But not bad all the same. When I say rough it's only slight. Quick wipe with emery would finish it nicely.
Overall I'm very pleased with the finish a shaper can give and very pleased I bought it. It can also remove material quite rapidly as well.