I'm guessing the spindles are fairly long and that when you are cutting toward the center is when they are breaking. I also imagine you are getting quite a bit of chatter between the chisel and the stock.
When cutting long thin pieces on the lathe you may need a center work support. There are several that are availible from aftermarket sources or you can make one your self.
Basicly a work support is 3 bearings that can be adjusted around a work piece, near the center to help support it and prevent chatter.
Jake
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