Doing Big things !!!

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Well Big heavy thing for me!
I finally overcame so many obstacles to obtain, deliver and setup this lathe! The final challenge was getting it wired up properly with no schematics. The control box was smashed and motor wiring ripped apart on delivery….. LONGGGG STORRRYYY!
Got it wired without letting too much smoke out of the motor on the first several tries.
Without a lesson, instruction or any idea what I was doing, (oh ignorance is bliss) I immediately went for it and managed to produce a aluminum front bushing nose cone thingy for my condor. Not bad for an hours work and breaking two cutters!
Big Deal and Big Thing indeed for me!
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Ok, this will kinda really show my ignorance . But what tooling/methods do you guys use for your inner or inside cuts. Obviously one could simply drill a hole thru some stock. I have a small assortment of boring bars which I used on this bushing . But what are you using to cut your inner o-rings ? I am sure there is many ways to cut a groove but what is a good way to cut inner grooves and how is the best way to measure the o rings radial profile and reproduce that radius acurately within the walls or canyon of the groove you are cutting. Do you custom shape a radius on the cutting edge of your tooling? Can you make any sense of my questions?
1. Best method/tool to cut inside, drill bore or face? (Maintain concentricity with inner and outer circumference?
2 Method /tool to cut a proper tubular profile o-ring groove ?
3. Method/tool to cut grooves inside of a bore such like inside of the bushing?