Building a homemade juice press out of a bottle jack from an old truck. I made the frame by layering a bunch of scrap plywood (OSB really) and plunge cut a hole in the middle. Then I cut the end out of a bread pan. The bread pan on my prototype is aluminum but I will replace it with stainless steel when I find one really cheap. I cut a piece of pine board to use as my top plate.
I grind up my veggies in a food processor. put the veggie pulp in the pan. put the top plate on the pulp, put the jack on the top plate and start turning the jack. I did a trail run last night, but I found a design flaw. The frame of my press is not wide enough to support the entire length of the pan, so the pan started to bend before the pulp was squeezed dry. So today I am going to cut more scrap wood to widen the base of the frame and make a base plate for the pan to sit on and it should work really well.
I will add photos to the thread as soon as I have the press working like I want it to. So far the cost of the project is $0 because I picked up the wood and the jack for free.