I don’t have a dedicated carcase saw filed crosscut. I have one hanging around the shop that I should sharpen and straighten the plate on, I just have not got around to it yet. So for the most part I use my dovetail saw for finishing crosscuts.
There are a few tricks to this.
First, use a knife to lay out your cut lines: It’s more accurate, but more importantly. It severs the fibers of the wood that would normally be torn up by the rip teeth (a crosscut saw acts like the knife). Take a look at what I mean.
On the left you can see my knife line; on the right side of the kerf you can see the fuzz that gets created by the saw. You get smoother cut with a knife.
The second tip is also shown in the first picture: don’t cut all the way through your stock from one direction. This will cause tear-out on the back and bottom of your stock. Instead cut down about an 8th” and turn the stock 90 degrees away from you (the kerf you just made will be on the exit side of your next saw cut). Cut an 8th” down your next knife line and repeat this process on the remaining two sides. The kerfs that you have made will guide you easily and accurately through the rest of the cut.
The results will look like this.
-- Make furniture that lasts as long as the tree - Ryan