I don't even know what it is called, but I am referring to the large sanders that look like planners, with conveyer belts and all that.
Well anyhow, several pieces got stuck in and sanded down 1/8" or so; I finally managed to force it in and it ran okay then. My instructor said it is because I didn't have the sandpaper down far enough to grab the wood adequately, but that doesn't make much sense to me; as it should have been easy to push, and shouldn't have worn down the grove.
So, any ideas what I might be doing wrong so it doesn't happen again? And, any idea how to reduce the defect? It is too big a board to start over. An orbital sander hasn't hidden it at all. Taking off enough wood to actually flatten it will leave the wood too thin; I just want to mask it. It happened 3 times, but two of them can be on the underside of shelves; the third can't go away.
Thanks.