Posted: Tue Jul 08, 2014 9:18 pm
I forgot about this, but the steel disks do flex.charlese wrote:I don't think it is caused only by table flex. It is important to get the table exactly 90 degrees from the sandpaper on the disk. This is an almost impossible task, especially if there are differences in the thickness of the grit and if the paper is perfectly smoothly applied to the disk.
Another strong possibility is variations in the speed of movement of the workpiece. As we all know - if a slower pass is used, more wood will be sanded. If you want to test this, get a sample workpiece that is just barely touching the sanding disk - pass it along and let it stall for a few seconds at one spot.
Any irregular speeds of the workpiece will cause an irregular edge. It is also what I call wavy when the 90 degree angle between the table and the disk is off a small amount. Parts of the edge where it joins a face will show the irregularity.