I need to remove a LOT of material from the centre of an ali billet (disk), so I tried to use an 86mm hole saw that I happened to have, mounted in the tail stock, but the chatter was horrendous so I canned that idea.
Any suggestions for reasonably quick removal?

The lathe is 40 years old, Chinese, with only 3 speeds, and is VERY under powered, so I can only take light cuts otherwise it stalls, so machining out the centre would take many hours.

The material that needs to be removed is basically a 100mm diameter disk, 37mm thick, from rest of the disk which is 200mm diameter.

Cheers. )


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