Plywood tearing or “blowout” is when the saw blade causes damage to the underside of the plywood as you are cutting it. Wood fibers are torn off when the blade passed down through the plywood. This is caused by a combination of two things; the wrong blade and the wrong throat plate. Either one can cause tearing but both need to be fixed to prevent plywood from tearing.
5 When raising the blade to cut through the MDF plate, it's okay to approximate blade height; just raise the blade until it's more than 3/4 inch. When you begin to cut your plywood, you can raise it more if needed.
Place the throat plate on a piece of 1/2-inch medium-density fiberboard (MDF). Trace around the plate with a pencil and cut it out on a band saw. Sand the edges smooth with a hand block and fit it into the saw tabletop where the metal throat plate came out.
Set your fence to the desired measurement. Place your plywood on the saw and turn it on. Ease the plywood into the saw blade slowly. Use a smooth consistent forward movement. Keep both hands on the plywood on both sides of the blade as you push deliberately. Don't stop or change your hand positions unless needed. When you get to the end of the plywood, slow down to a crawl to prevent the last few fibers from tearing off.