Hello. I am refinishing a large hardwood floor project and need to know how to prevent clogging of the drum sander abrasive when stripping old floors that have a very thick varnish layer. Any advice on how to avoid this?

Many thanks.

Use a open cut sand paper for the first pass ..

Also run your drum at a slight angle (No more than 15 degrees) to the run of the wood. Trust me ... just try it ....

If you do that , make sure you run a sraight pass with the same paper to remove the scratches ..

Yeah ... what he said

This technique should only be necessery in the first pass over the whole floor then a second "straight" pass with the same paper (or slightly finer with some species) to correct scratch direction.

Good Luck!

PS sorry for such short/sketchy info earlier ... was very tired at the time .....