Well, I just worked in about 2-3 cubic yards of shavings into my compost pile, which I thought was all it would take. I have about another cubic yard that didn't get mixed in. As Stu mentioned, its VERY hard to turn compost that is just leaves. It seems to compress very well to itself; as the leaves break down, they sort of glue themselves to each other. You could really feel the warmth in there, however!! I googled "woodturning shavings nitrogen speed up" and found info on a site from Montana State University, which seemed pretty well tested. It suggested 3.5 lbs actual nitrogen, which works out to either: 17lbs ammonium sulfate, 15lbs of blood meal (expensive), or 11 lbs. ammonium nitrate, or 8 lbs urea as necessary for balancing the nitrogen content of 1 cubic yard of fresh shavings.
I decided to go ahead and try this, and added a 40 lb bag of 10-10-10 fertilizer to my compost pile as I worked in the shavings, paying close attention to be even. This isn't quite as much nitrogen as 11 lbs of ammonium nitrate, but its what I had on hand, and the compost pile was already FULL of nitrogen, at least by my estimation of what went into it; weeds, grass clippings, veggies, leaves, old potting soil from repotting plants, garden waste, etc......
I watered the pile heavily, as the shavings were really dry after sitting in the sun for several days. I was actually quite surprised. Its been pretty dry here lately, but the humidity is high in VA. Go figure. I'll post again in a couple months as an update.
Happy gardening!! (and turning, of course)