Last week I posted a question on an alignment problem I was having with my Powermatic when cutting miters. After taking the saw apart (pulled out everything under the table), cleaning it and putting it back together, I still had the problem. Powermatic suggested shimming the trunnion brackets which didn't work. After getting someone else to look at it, I saw that the bolts in the back that hold the trunnion bracket in place, were hitting the bar that holds the saw guard in place. These bolts were installed when I put the PALS system in and are not original.
Since I use a Brett overhead guard, I don't need the bar installed anymore and I took it off. Even after I did this, I still had the alignment problem athough not as severe. I'm out of square now by about 1/32" over a 6.5" miter instead of 1/4". (And no, the problem is not with my miter guage being out of square with the blade the problem is the blade is out of square with the miter slot when tilted to 45 degrees).
Powermatic just sent me a PDF on how to true up the tie-bars. They also called me to get me up to speed. (Good customer service!!!) In the PDF, they talk about using a flat plate across the bars - on the phone, they said use a piece of glass.
I'm posting it on abpw in case anyone else has a similar problem. Hopefully this procedure will solve my problem. If it doesn't, anyone want a Powermatic 64A???