Wondering if anyone has experience with turning case-hardened material.

Looking to bore out some gears that originally ran on needle rollers so they will take a tapered roller bearing. Its definitely been done with these particular gears (old Landrover 4-speed gearbox) and apparently the bloke used ceramic inserts to gradually get through the hard case and then turned normally.

I'm hoping with the right technique it might be possible to just get under the case with carbide tools.

Any tips would be appreciated.

Steve


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