You will need to use two sanders, the main drum sander (pads are not good for taking down old finish), and an edge sander (again a ROS or anything you have in your shop will likely be inadequate).
The drum sanders have a handle on them for lowering and raising the drum, and this should only be done when the sander is moving. So start moving, drop the drum, then raise the drum before you stop just past center. God slow and easy until you have the hang of it.
Then using the edge sander, take light strokes along the walls and door frames, using light pressure and constantly moving.
Any spot left that the sanders can't get at can be gotten with a scrapper. Just use a nicely sharpened paint scraper. You will want to use it along any finished edges such as cabinets or trim you can't remove.
Then step down to a finer paper to get a smooth finish.
I would highly recommend a water based finish, like Traffic by Bona at least for the last 2 coats. There are also products to use for the first coat, and even an additional second coat, that will bring out the grain in the wood and give it a bit of a nice warm glow. You can check with a supplier for the products. All this said, we never do it ourselves anymore. I even hired a our floor finishing guy to do my floors. We do still install most of our own floors. Not sure what all they offer for renal equipment now, but the sanders that the pros use give off very little dust. Joseph Rohdes
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