Originally Posted by johnwright238
.... and put a 45 degree edge on the cutting side and a few steep passes on the backside.
As somebody noted, the angle for most blades is 30, or 33 degrees. 45 is way too steep. Also, I have never read anywhere that a blade should be touched on the backside (maybe a flat handfile to take off a burr, but never a grinding).
To answer the question: Yes, all new blades need sharpening. Usually, the manufacturing process includes a shear to take off the edge, but the shear does not make the blade sharp for cutting operations.