My experience.....
Jim in Houston
>I used common constuction lumber for the top of the bench I built about five years ago. I did this for two reasons. One: It was significantly cheaper. Even buying 2x12's and cutting out the good parts it was hundreds cheaper than using hard maple which was, if I remember correctly, about 7-8 dollars a board-foot for 12/4 stock at the time. Two: I had no idea how to successfully glue up and flatten (still working on the flattening bit) such a hefty slab at the time and I didn't want to make my first attempt with several hundred dollars worth of maple.
Does it wear? Yea, it does. Have I seen a great deal of differential wear early vs. late wood? Not that much. But I did use the quarter sawn surface up primarily and there wasn't that much separation between the rings in most of the stock I used.
Did the edges wear very fast? Nah, I wrapped the edges in ash. Did it stay flat? Well it's stayed about as flat as I was able to make it five years ago. I could reflatten it, and I probably should, but I may reserve that effort for an actual maple top should I decide I need one in the years to come. But the construction grade stuff top I have sure has been a joy to use compared to not having a bench at all.
Word of warning. Buy the stuff, let it sit in your garage stickered and weighted down well at least six months before you begin to machine it. You'll be stunned how much lighter it is in weight when you pick it up six months later. It should be dry enough then.
My six months were from May to October. Very hot months here. The wood dried out nicely. Don't use the pith in the middle, it'll move no matter what you do. Throw it away or burn it. It's pretty much useless.
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