obviously you want to hear and watch it run. Check the
blade for run-out if possible. Make sure the adjustments
work.
If the table top is badly warped you’ll have problems with
some cuts. If the arbor has bad run-out you’ll have to get
it flange-faced, which means taking it out and a trip to a
machine shop.
I’ve had good luck in general. Older machines from reputable
manufacturers sometimes have adjustment issues but they
were well made.
If you are looking at some no-name Taiwan saw from the 80s
or the 90s watch out – quality control was all over the map.
Table saws are simple machines. It’s faulty manufacturing and
broken castings that can sour a machine purchase.
-- http://amherstcabinets.com - also a marketing consultant with expertise in direct response marketing for woodworking and online businesses - http://COPYMATCH.COM