The round column mill has a stout quill

I use only the quill to adjust height. I rarely raise or lower the head. For holes, I put a center drill in the collet and then drill the correct hole later with a drill press. I rarely use the drill chuck in the mill/drill since I would have to raise the head.

Looking at the round column, vs the dove tail column. The quill on the round column looks much larger diameter.

If I get any chatter, or it sounds like it is straining, I back off the depth of the cut and make extra passes.

I would love to have a Bridgeport but at least you don't need a fork lift to install a mill/drill.

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I just looked it up:

The dovetail mill/drill has a 2.35 inch diameter quill.

I believe the RF type mill/drills have a 3 inch diameter quill.