Please paint me a picture. I'm trying to figure out what you are doing.
You have a left-tilt Craftsman (upper grade) TS with an Incra system on it right?
When you doing your crosscuts and rip cuts... you are going against the rip fence or using your Incra miter for crosscuts and your Incra fence for rips?
Or are you saying that with a somewhat square piece of wood, you can put it against the rip fence, go with the grain to make a rip cut, turn 90 degrees and crosscut against the grain, you get 2 different measurements? Wouldn't happen to be a thin kerf finish blade would it? Sometimes those, when used for ripping, will have a tendency to follow the grain...
Another thing to try is to take a piece of scrap about 12" long... put it against the rip fence & cut a thin piece off. Turn the piece clockwise 180 degrees so the fresh cut is against the fence.Adjust the fence in 1/8 in. Run it through again. (Those cuts will now be parallel.) Adjust the fence in 1/2". Turn the piece over (top to bottom, left to right). Run it through again. Take the off-cut and measure the width at each end. Tell us what it measures out as...***
Edit-- notes ***: Mark the first cut as "A". Mark a wavy line along the edge that is towards the front of the saw. So on the second and third cut, the wavy line should be the same orientation, if rear on second, still rear on third. What the off-cut should show you, if it is different measurements, that divided by 2 shows how far out your rip fence is from being parallel to your blade. If it's out. first check your blade to the left miter. I set the blade to the left miter and the fence to the left miter (with the back kicked out 0.001" to 0.002"). For setting fences to the left miter slot, I have a 36" long 3/4" square machined bar that I lay in the miter slot... I then move the rip fence to it. I put a 0.002" feeler gauge at the rear of the fence and adjust it. If the fence has a little flew to it (which yours should not, so ignore the next) then I set it dead on.
"Don't worry, I saw this work in a cartoon once."
"Usually learning skills and tooling involves a progression of logical steps."
Last edited by MAFoElffen; 07-15-2013 at 08:09 PM.