02-21-2012, 11:25 AM
Sorry missed your question, the back plate 4 jaw came with the lathe when it was new, and the direct mount I picked up with a heap of cheap gear for the same style of lathe that was sold on ebay locally.
The direct mount is lighter to change over so I use that all the time now, but the back plate mount has a slightly larger centre hole and will also take jobs deeper in because of it's thickness. So for the odd job that needs the extra capacity I use the back plate mount chuck, but all other times I use the direct mount.
I never sell tools so both chucks are staying, LOL
I had to re machine the D1-4 taper on the direct mount because the it was a sloppy fit on the spindle.
The 250mm 4 jaw is for the really big jobs on this lathe and I don't run it over 1200rpm, because it's not meant for a lathe this size (12 x 36), but for the odd big job I was having trouble fitting it does it's job. This chuck also goes onto the 250mm rotary table, and I bought it to do both jobs.
Dave
The direct mount is lighter to change over so I use that all the time now, but the back plate mount has a slightly larger centre hole and will also take jobs deeper in because of it's thickness. So for the odd job that needs the extra capacity I use the back plate mount chuck, but all other times I use the direct mount.
I never sell tools so both chucks are staying, LOL
I had to re machine the D1-4 taper on the direct mount because the it was a sloppy fit on the spindle.
The 250mm 4 jaw is for the really big jobs on this lathe and I don't run it over 1200rpm, because it's not meant for a lathe this size (12 x 36), but for the odd big job I was having trouble fitting it does it's job. This chuck also goes onto the 250mm rotary table, and I bought it to do both jobs.
Dave