I visited my local brew @ home store and got a quick run through of the process of making wine, and all the basic materials. The store manager estimated that I had over 100lbs of grapes which could produce close to 10 gallons of juice. From what I remember last year, we took about 15 lbs of grapes (stems and all) and got about 1 gallon of juice after 45min of mashing and squeezing through a cheese cloth. If we want to get through all 100lbs....there had to be a more efficient way.
My basic plan was to use a car jack to push a disk into a perforated stock pot, to crush the grapes. In the next few pages you'll see the contraption I came up with.