I have a heavy duty Dewalt hammer drill used for concrete drilling. I cut a 16mm SDS bit (which suits the drill) in half and welded a 1/2inch socket extension on.
Put the SDS bit in the drill, fit correct size socket onto the extension to suit the nut on the cutter sprocket, drop the main drive chain to the cutter and I'm backlapping. As Morphias said turning the cutting reel backwards while applying a cutting paste. I use 180 grit paste.
I back lap when the cut is cut is dull. I try to keep my blades cutting paper all year round.
The process is quick if you keep on top of your sharp blades.
My backlapping tool (drill / extension with socket) suits me though if you were doing it frequently on many machines you can buy a backlapping machine. They are simply an electric motor with a couple of pulleys, a shaft where a socket fits to with an adjustable height.
I took my SB65 to a local bowls club with a new bottom blade fitted and they bedded it in for me by backlapping it. I watched the process and am now doing it myself.
Last edited by Aussie Blue; 23/05/11 05:22 AM.
