On Tue, 14 Aug 2012 20:22:08 -0500, "sal" wrote:
Hi I have a scenario to run bye you guys I have to cut 1/2' plywood panels
with 45 degree edges to make mitered joints .Is it better to cut plywood
square and then run it though the router table that has a 45 degree bit?

What are you cutting them with square with? If it's a tablesaw, then
cutting them square and cutting the 45° angle all on the tablesaw is
the easiest, fastest and most exact method.

If you're cutting with a circular saw, then I'd still want to make the
square and 45° cuts with that too.

Trimming plywood with a router bit is messy and prone to mistakes.