My cnc lathe was originally equipped with a 4" chuck and a separate 2-1/4"-8 threaded backplate adapter.

Unfortunately the chuck was missing when I got the lathe so I need to purchase a replacement.

My question is whether I need to machine my own backplate adapter using something like this (I can't find one specific to a 4", this is smallest I've found) https://littlemachineshop.com/produc...ProductID=1923

Or whether I will get sufficient accuracy with a pre made one such as this (https://allindustrial.com/all-indust...-lathe-chucks/) which seems to match the chuck I'm looking at.

If anyone knows of alternatives I'd love to get a URL.

Thanks

Sent from my MI PAD 4 PLUS using Tapatalk