I have purchased a lot very good new chucks over years . They had to be closer that collet for working being held.??
The collet using the the spindle tapper is best.
UP DATE??
It is tapper most common is morse or jano. Lathe manufacturers have other tapper too. Most use some version of morse tapper.?
The ones using the chuck mount could less accurately.??
I am looking at a chuck mount 5C collet.?
The main problem with any collet system is time takes to change from chuck to collet.? So simple quite project takes more time changing to collet .?
Dave?
davesmith1800