Slotter or broach driver.

[tonyfoale]

............ but also know that shapers can do most things the mills can do, and a couple of things they can't.

You may be a devotee of shapers but that is somewhat of an exageration. How would a shaper help me do this, which is typical my milling needs?

or this

I've actually had my shaper for several years, having bought it as a restoration project, and it's been put on the back burner so many times I lost count a few years ago.
Bill

That is another reason that I have no desire for a shaper. I have nothing against shapers but they just offer nothing to be of interest to me.