Keep steady air stream on boring bar during the roughing operation to keep chip buildup to the minumim.
Finish cuts .002 , .001 & .0005 to get -.003 from final size of .4900.
The National Ball-O-Matic company will do the final sizing using balls. They told me to leave them .003 to finish.
I left the lower bushing long so they have something to press against. Will need to make, or they may have, tool to support it during the ballizing operation.