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I made my own sawmill and using tires to run bands on.Had an issue will wobbly cuts but since fixed that by tightening bands more.Now when I cut I get different widths from when I started from and when I finish.ie:start a 6" cut ends up at 6 3/8" I checked blade height from bed and they are both the same at either end,its like the blade goes where it wants.new blades,checked everything for levelness including carriage and bed,both tires are plumb and they track perfectly.The only thing i can see might be a problem is that the blade itself is not parallel to the bed but its not off that much .I bought the bearing guides from cooks.what do you think?
Use a 2 foot level center placed on the blade being sure the level is in a place were it is not affected by the set in the teeth,and check the height from the end of the lever to the bed, This will check to see if the blade is running parallel to the bed. If that checks out it could be the blade guides or the blade.
How is your mill frame supported? Is it on wheels, or do you have jackstands on either end? Or is it on fixed posts?
I occasionally have thickness issues when I first set up my portable mill if I don't take the time and level front and back. As the mill head moves over the track, the track may flex. The logs is supported by other parts of the mill, but the head is only supported by it's posts. When it gets near the ends it may track lower in relation to the cant, and that's how you end up with differing heights from front to back.
I don't think you have a blade issue, either with alignment or sharpness. Unless you can run your hand over the board and "feel" waviness in the cut, your blade is probably not the problem.
One other thing is that cant's move while they're being sawn. IF the log has "reaction wood" in it, and it's not secured by the posts and clamps, it may react as you cut the board from it. I don't think this is your problem though. If it were happening, you'd notice the board that you cut flexing up or down as you cut it.
I think the frame / rail supports are where you will find the problem.
problem most likely is stress in the log I make 6x6x9ft and some lift 2in or more by time I get to the end and 1/4 to 3/8s thicker at 9ft end