One of the greatest belt sander evolutions came when they decided to add a vertical sanding disc to the side of the units to give a greater area of sanding surface and control. Newer sanders generally have a sanding spindle that is coated with a fine layer of rubber, so that adhesive sanding discs can be adhered without much effort by the operator. You will want to replace the sanding disc if it is worn, has bare spots on its surface or you can see through the sand surface to the paper backing.
Step 1 - Remove the Disc Sander Spindle
Before attaching your adhesive sanding disc, you will want to take the sanding spindle to make it easier to get the old worn sanding disc off the spindle. Depending on the model of your machine, there may be added steps or safety screws or bolts that need to be removed as well to get the sanding disc to be removed from the shaft. Be sure you practice standard lock out processes before handling the machinery parts to avoid injury.
Once the power has been turned off, you can begin to remove the sanding disc spindle from the housing. It will make removing the old sanding pad much easier. Follow your instructions to remove the spindle from the machine mounting, if it does not come out of the unit, do not be concerned and move to the next step. Once you have the spindle removed, clamp it into a vice for a better working surface, be sure not to gouge or mar the spindle.
Step 2 - Remove the Old Sanding Disc
Now take the flat screwdriver and begin prying the edge of your sanding disc up carefully, be sure not to peel or crack the rubber coating on the disc. This surface needs to stay in tact for your new pad to adhere to the disc correctly, without slipping during operation. Spin the disc, or move around it as you lift the edges up. You should see that it is coming right off without too much effort, if it is difficult, you may be removing the rubber as well which will ruin the parts efficiency. Be sure you are not removing the rubber layer that the disc sticks to.
Step 3 - Clean Up any Remaining Glue
Once the old sanding disc is removed, you can apply acetone to your rag and clean the residual glue on the disc surface. It will not harm the rubber and will make getting the glue off the unit painless. Once the surface is cleaned and dried, apply the new adhesive sanding disc to the rubber surface evenly. Let it sit, or even apply pressure to it before use to insure it is properly connected. Once the pad is secured, reassemble the spindle to the unit if you removed it, and ensure that the side table is locked back into place with a 1 to 2 mm gap from the sanding disc.