The bronze gears which I cast yesterday were cut off the tree with small bolt cutters, band saw and hack saw. Then a belt sander to reduce the daggy bits.
The faces needed to be flattened in the lathe, but how to hold the rather thin, delicate, irregular gears?
Soft jaws made of aluminium, and exactly machined to match the external diameter of gear teeth, so there are multiple contact points, and minimal chance of damaging the teeth. I made these soft jaws ages ago, for just this sort of job.
The soft jaws may be used multiple times, machined to shape each time. Very handy in this situation.