lead screw or rack and pinion ?

Hi All,

I am persuing the design of a 8ft x 4 ft router table, moving gantry
style and am looking at the best way to move the table.

seems the consensus so far is to power both sides to prevent racking
of the moving gantry.

the question is wheather it is better to use lead screws, driven by
timing belts, lead screws driven by gears and solid shafting, or rack
an pinion driven by timing belts or gears and solid shafting.

of course alternate methods are welcomed. I'm in the design stages
and it looks like I am going with Hi Win linear rails and bearings.
(Mclem@ ??? on the list offers a good deal.

I was thinking of using NEMA34 steppers to drive each axis, geared
down as speed is not too important (yet) and it looks like the table
is simple to build. I checked out welded tables and the twisting is
too much to handle. seems like you have to learn a multitude to
subjects to get a good result in this hobby. (Mariss makes driving
the steppers just too easy)

Dave