Following is an example of this conundrum. Back in the late thirties PM published a plan for a useful horizontal disc sander, it's easy to see how this could be very useful, especially for sharpening edge tools, with a few jigs to control the angles.
Below is the plan for the disc sander along with a plan for a beast of a belt sander. I got this from a Popular Mechanics Press book titled "Forty Power Tools You Can Make". It was published in 1941 and the plans are all taken from previous PM magazines. I have posted most of the plans before, in the Shop Notes posts.
Dave Gingery does a recreation of this disc sander in his first book in the "Metal Working Shop From Scrap" series, "The Charcoal Foundry". Dave recognized the versatility of this disc sander for pattern making and tool sharpening and built one almost exactly the same as the old plan in PM. This may have been a product of Dave's very creative mind, but as I like to say "Their's nothing new under the sun" old becomes new again, just a little different.
Don't forget to read Dave's nice little write up on the disc sander and it's uses.