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Slap plenty of kero on it as you machine it and it seems not to foul the tool.
Plenty of clearance angle and a honed edge to the tool helps too.
I've machined stuff I cast and as long as you keep the RPM up and the tool immaculate it works ok with rough aluminium - though nice fresh stock is lovely to work with by comparison.
I always wondered why they didn't make right handed lathes ( chuck on the right) much easier to make shouldered threads in that direction
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