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Is there anything special I should know before attempting to grind a ductile iron bottom fuller shank to fit my hardy hole? 

Pnut

 

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It can withstand heat very well; just don't quench it in water. you can grind it fairly hot; but leave it to aircool. if you work ik fysically; it does workharden (become brittle) a bit.

from my understanding, ductile iron is a special form of cast iron; which get's it's special abilities from the molecular structure with grafite and such. It's much stronger than aluminium; but much cheaper than forging the same part out of steel. It's somewhat mallable, but to a degree.

The dust is also not good for your health in prolonged exposure, so use all the needed PPE; as it does make noticeably more dust, less chips than working steel.

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