Yeah, but...
You were given
this link.
Yeh ,but in spite of all cautions to the contrary, that gizmo doesn't solve the entire issue.
If it were me, and need to turn some rounds or dowels 2" or slightly large here's what I'd do:
Chamfer all your stock with 45 degrees bevels, to get them approximately"round".
Set your drill press on the slowest speed, around 300 to 500 RPMS. You may not be able to get it that slow, so there may be additional modifications needed. A slow speed is very important when starting to turn an object.
I'd use the existing chuck ... IF it will hold a 1/2" shaft.
Use a 1/2" lag bolt, the hex head removed, after it's been screwed into a pilot hole in the top end of piece.
Chuck the end in the drill press and tighten it as tight as you can... frequently.
Some lag bolt or other similar attachment at the bottom end is also necessary , but must be secure and not allowed to wobble... at all.
A tool rest similar to the "link" will be necessary to avoid a "catch". It must be very rigid and not move... at all.
Your lathe tools must be sharp.
Face protection is a must.
Now throwing caution to the wind, start up the drill press.
Hope for the best, be cautious and don't blame us if anything goes wrong...goes wrong... goes wrong...
If you have a router you can make all sorts of round cylinders with a turn crank on the piece and a sled to hold the router.