Wedge breakage
We broke our big splitting
wedge today.
A little chip off the side
makes a big difference in getting the wedge started.
The medium size is almost as
good requiring about 20% more elbow grease.
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About us: Anna Hess and Mark Hamilton spent over a decade living self-sufficiently in the mountains of Virginia before moving north to start over from scratch in the foothills of Ohio. They've experimented with permaculture, no-till gardening, trailersteading, home-based microbusinesses and much more, writing about their adventures in both blogs and books.
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Plastic is really too soft for this use. I have the same problem with the plastic wedges that I use to get big composite products out of moulds: the wedges wear out and break easily.
One idea for your application would be to "wrap" new wedges in a piece of steel sheet. That might improve their durability, I think.
Another thing that might be worth looking at is the kickstarter campaign for the kindling cracker 'king'. The basic idea is very good. The blade is stationary, and the wood moves. Also, the ring on top means that you cannot hit the blade with the hammer.