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There are many ways to make a square pocket. Everything from wire EDM (leaves the wire dia/2 corner radius) Sinker EDM (square electrode with sharp corners will make sharp corners) As mentioned by Anton, a more old fashioned production method is broaching (a form tool with progressive steps is pressed through the hole) and a very old school method, using a die filer. (sort of a jig saw for files) I think the arms for your sway bar are aluminum so they would probably be broached quite easily. It's fast and accurate. A great machine tool accessory found on some old bridgeports was a shaper head. It reciprocates a lathe type tool and shaves away the material with each stroke. It was often used to cut internal key ways.
Another way to overcome fitting a sharp square into a pocket is to mickey mouse ear the corners. That is to drill a relief hole so that the sharp falls into the cleared area. It is also much easier to mill since the end mill is not trapped in a corner.
I kinda dig the old shaper attachment when I have time to play.
We often pick corners with a ball mill down to a .020 radius in some deep pockets.... 5 axis indeed..
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