how do you cure the lumber
what % losses are normal when you make your own lumber(checking, splitting, cracking, etc)
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Knot (hehe) Pine, but I'll chime in a few answer until he gets back.....
I air dry all my lumber first, stacking on 1x2x50" sticks, and either put in a shed, or covered with roofing metal for about 6mo-year. If the use is regular construction lumber, use it right from there.
If the use is trim, flooring, cabinet or furniture, air drying will only get you to a bit under 20% here, which is fine for construction, but not low enough for furniture use. I move the air dry into my dry kiln in my shop, run by an old window AC unit, and take it on down to 6-8% MC.
As for cracking/split on the ends, saw your logs an extra 6" in length, and that will handle most of it. Some species, like yellow poplar, are worse than others to end check, but generally the loss isn't too bad. Good thing to do for valuable logs is end seal them with special products just for that, OR what I do is use any old paint I have left over or laying around, and slap a couple coats on the log prior to sawing. (Easier than painting individual boards AFTER sawing)
This log for example. Black paint on the end of it.....more to highlight how lap siding is made on a bandsaw than to stop checking, but gives you an example.