A shaving horse, called a "shaveshorse," by Lie-Nielsen, is designed for shaping long narrow pieces of wood. You sit on one end and pull a drawknife, spoke shave, or other tool toward you. As you pull with your hands, you push with your foot against a treadle. At the opposite end of the arm is a jaw which holds the work in place against a riser. Hence, the harder you pull against the work, the harder you hold it in place. ~~~~~
This model is based on the shavehorse offered by Lie-Nielsen Toolworks designed with the help of chair maker Brian Boggs (http://www.lie-nielsen.com/catalog.php?cat=538). It is notable for the use of a movable riser which allows for various workpiece sizes while keeping the position of the hands in the optimal position. I started this model to better understand the design, but as I tend to do, I added detail. ~~~~~
The diagram on the Lie-Nielsen site (included with the model) is not exactly reflected in the model, especially in the placement of the teeth for the height adjustment mechanism. Where joinery is drawn, it is a guess. The seat is only an outline. It would be fun to model in detail, but it would be better done with a spoke shave and a travisher.~~~~~
I have no connection with Lie-Nielsen except that I am a very satisfied owner of one of their 60-½ block planes.