lathe -> cnc

Group; (mob) :-)

I have a Jet 1340 which I'm thinking about moving from
manual to cnc control. At this point my concerns are driving
the cross-feed (x) and the carriage (z). I think I have the
axis labeled correctly. ;-)
Planning on using emc for software. Need guidance in the
area of servo motors vs. steppers.

Available servo motors:
a. Hitachi 24 v 2.2 A 38 oz-in with encoder (off DEC
LA-180 printer.
b. various 28 V servo motors from 1/2" industrial tape
drives.

Are these enough power or is more needed? Response times
adequate for threading are critical!

Germane to the whole issue is whether to go servo, either
the ones I have or go for more power, or try steppers. (
Don't want to start any religious wars here but the answers
will be useful).

Recommendations, experiences, etc. would be appreciated.

Dave