Harry Myers
08-08-2010, 12:29 PM
I have a table saw setup problem that is baffling me.
I've had a Bosch 4000 table saw for 7 years. It has always been very accurate. Now, all of a sudden my rip cuts aren't square (instead of 90 degrees I get about 89.5 degrees). It doesn't sound like much, but when you stand a board on the cut edge, it's very noticeable (1/4" of lean with a 24" wide board).
I’ve verified the blade is perpendicular to the table with both a machinist’s square and a wixie angle meter. The wixie shows the error is less than .1 degree, yet my cuts are off by .5 degrees. The metal throat plate is straight, and flush with the table. I’ve tried a Freud 50T combination blade, and a Freud 30T Glue Line rip blade. Both gave the same result. The runout at the blade measures 0.002”.
What I’m beginning to suspect is that under load, the entire blade mechanism tilts slightly to the left. I flipped the saw over to look for something loose, but everything is tight. Any ideas what this could be? Again, this is new behavior. The saw did not used to cut this way.
I've had a Bosch 4000 table saw for 7 years. It has always been very accurate. Now, all of a sudden my rip cuts aren't square (instead of 90 degrees I get about 89.5 degrees). It doesn't sound like much, but when you stand a board on the cut edge, it's very noticeable (1/4" of lean with a 24" wide board).
I’ve verified the blade is perpendicular to the table with both a machinist’s square and a wixie angle meter. The wixie shows the error is less than .1 degree, yet my cuts are off by .5 degrees. The metal throat plate is straight, and flush with the table. I’ve tried a Freud 50T combination blade, and a Freud 30T Glue Line rip blade. Both gave the same result. The runout at the blade measures 0.002”.
What I’m beginning to suspect is that under load, the entire blade mechanism tilts slightly to the left. I flipped the saw over to look for something loose, but everything is tight. Any ideas what this could be? Again, this is new behavior. The saw did not used to cut this way.