If you have a severely scarred, uneven, water-damaged or painted floor then you may want to consider not only starting with a coarse grit, but sanding at an angle to the grain.
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It only applies during the rough sand stage, but it is a very efficient way to speed the process of cleaning and leveling an old floor.
Because of wood&#;s natural tendency to shred and splinter when it is sanded off-grain, the sander can remove more wood with the same amount of effort when positioned at an angle. The angle does not need to be drastic; sanding just 10-15° off parallel is enough.
The downside of using this procedure is that, after you make an entire pass at an angle, you must follow it with another pass parallel to the grain at the same grit. So, if you do a 24-grit cross-cut pass, your sanding sequence would be 24 diagonal > 24 straight > 36 > 60 > 80.
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Newly installed floors can be rough-sanded with 36-grit parallel to the grain.
The rule to remember is that, no matter what grit you choose as your starting point, you must sand, in order, with every grit that is finer than your starting point.
So, if you start with 16-grit, you cannot jump to 36grit; you must go 16 > 24 > 36 > 60 > 80 on both machines.
If you start at 24-grit, you cannot jump to 60; you must go 24 > 36 > 60 > 80 on both machines.
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