Originally posted by rmorris:
A drum sander can do anything a plainer can plus a lot more, that would be my vote. I am not sure what I did before my grizzly baby drum sander or why I did not get it earlier!
Roy is correct. Kinda. Both machines reduce the thickness parallel to the bottom the surface. For bow making, I think a thickness sander is way more useful. It doesn't care if there is fiberglass, gnarly grain, glue, etc. It gives you more control on height.
But, a thickness sander is a slow and painful way to bring rough stock into dimension in any quantity. I use my planer all the time, but I admit it is almost never for bow making. Really more of a furniture/cabinet thing.
So if you're planning to use your shop for woodworking in general, I think a planer might be worth considering. But if you're looking to do risers and laminated bows, you may think about a thickness sander first. In an ideal world, you just buy both.