Several weeks ago I got a chance to use the Jet 1642. All in all a nice machine, however, I found something I didn't like about the "Spindle indexer." You had to hold it in to keep the spindle from moving. I use the spindle lock on my Nova to hold everything in place while putting a piece in the chuck. I find it's necessary when using a two tommy bar chuck, of which I have several. Also, if you want to do fluting or other decorations to a spindle, you need it to lock into place. I could not find a way for the spindle to lock.
If this is important to you, you might look around at Nova and other manufacturers.
Bruce Shiverdecker - Retired Starving Artist ( No longer a Part timer at Woodcraft, Peoria, Il.)
"The great thing about turning is that all you have to do is remove what's not needed and you have something beautiful. Nature does the hard part!"