I suffered from a disease called dial indicatoritis. I used to check alignment all the time and the more I read the more I did it. I was anal. As Doug said above a couple of thou out doesn't matter but I was obsessed. The cure came from a good friend of mine who asked, are you cuts square? Are your rips parallel? Is there any burning? Can you see teeth marks? etc etc. Then put away your dial indicator and make something. My saw was cutting very well, in fact the cuts were joint quality smooth and thanks to him pointing that out I now use the cuts as a guide not an instrument. I remember trying to find out what an acceptable alignment error was. Some sites say zero, which is ridiculous, and others say 3 thou. I started with 2 and tried to get less that that and in fact made it worse. Ended up at 4,may have been 5, and stressed about it but as my friend said your cuts are smooth, parallel, square and accurate. So I'm now acting as a woodwork shrink to anyone suffering from the same disease. :wink: