In article , "Steve
Firth" says...
justme wrote:

I'd like to make a log splitter myself,

Take a piece of steel, shape it into a wedge. Make at least two of them.
Buy a sledgehammer. Hammer wedges into log.

Buy a maul and a wedge - use the maul as an axe for easier logs, and
to hammer the wedge for the tricky ones.