Boring Mill

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Machining an internal spherical radii?

How do you machine an internal spherical radius on a non cnc boring mill? These have been machined for years (before cnc or tracer equipped machines) but I have never cut one. I have cut external radii on manual lathes by using pins, but can not figure out how to cut internal on a horz. boring mill.

You can cut an internal radius by using a rotary table and milling cutter or you can use an adjustable boring bar.

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