This look like it works pretty well.

easy
hand the wife/kids a maul and splitting wedge
and lastly this one shows you don't even need a motor, just some scrap metal and an old car spring!
Getting some helpful thoughts here.
Good point on the type of wood being split. We are in Iowa, so as mentioned will likely be larger diameter, twisted grain.
This is actually going to be for my son. He and a friend of his are clearing some timber on a farm close by and selling the wood. So going to be a low bucks project.
I will have to check to be sure what all I have on hand. But pretty sure I will be able to come up with a beam. I have a good Kawasaki horizontal shaft engine, left over from a trash pump that froze and cracked the pump casting. Pretty sure I will have a cylinder and valve that will work. And tank and hoses should be no trouble.
So far nobody has said anything about design and specs on what is needed for a splitter. Sure I can look at one and start building, I just thought there'd be some ideas others have already been through.
Now we have some background !This is actually going to be for my son. He and a friend of his are clearing some timber on a farm close by and selling the wood. So going to be a low bucks project.
Idasho, I have a splitter very similar to that, but it's green and seems to be an old Poulan. It belonged to an old guy and my step-dad got it when he passed away. I replcaed the engine with a new gas Honda, makes the world of difference.
As I mention, I can but don't always build. I went way too long with a couple attempts and fartsticking around, finally bought one ready to work and was using it 5 minutes later.I agree with all the others - either buy new, or rehab a used one (if you can find a cheap one). Building mine was fun and educational, but not any cheaper.
Northern Hydraulics has (or had) a paperback book on how to build a hydraulic log splitter. I have one around here somewhere, but ended up picking up a (well) used splitter for $500.
I'd never be able to build one for that.
Northern has all the parts, except probably except the beam and hoses.
Find and old splitter and rebuild it.
Going to be much cheaper and easier to do than building one from scratch.
I did just that a few years ago. Picked up on old splitter from gramps' when he passed away, and I brought it back.
It kicks ***, and it is nice to hold onto something with some history.
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It hadnt been used for probably a decade. Though I remember using it as a child.
Now it routinely splits 5+ cord a year.
Here is a picture of it after the rebuild. Since I have upgraded the fluid capacity. It now has a 3 gallon hydraulic fluid tank. With the small original tank the fluid wold overheat after an hour or so of use.
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Wow, my dad has the exact same splitter and it belonged to grandpa before that. It has worn out two motors and is currently running with a honda pressure washer engine on it though. Amazingly it has had very little done to it other than some modifications that one of my dads buddies made to it a couple years ago to raise it up higher while splitting and added a table on both sides of the wedge to catch wood as it splits. That thing has to be 30+ years old as I am 35 and can remember helping and watching when I was really young on my grandpas farm.