Operate the drum sander at the speed recommended in Table 18-1. Start at a low speed and gradually increase to where you are getting the smoothness you need. The problem with excessive speed is that enough friction can occur to burn the wood unless the feed pressure is feather-light. Also, since friction heat can draw pitch or resin from the wood, excessive speeds cause more rapid filling and clogging of the abrasive. So work wisely at a reasonable speed and use only the amount of feed pressure required for the abrasive material to do its job.