Ran out today to replace my 5" orbital sander. Of course they no longer make the one I had just wore out. But had to have one today so I end up getting a sander with options I don't need. I bought the floor model to save money....No instructions.

This sander has speeds from 7000 opm to 12000. What speed is best for what ?

Just a guess, but like speeds on a lathe, the finer the detail, the higher the speed. Rough sand at lower speeds, and increase for finer grits.

Take this with a grain of salt... it's just a guess.

You may also want to see if the instruction manual is available online.