I have a Woodmizer LT-40 sawmill. It has been stored for about five months without being used. When we brought it back out we performed the regular PM on it, (lubrication, oil change, calibrations, replaced rollers and belts, etc.) When we began cutting again I started to notice that it seemed to be raising the grain on the wood very badly. The cuts are straight and not dipped or wavy but the wood was not as smooth as it used to be. The logs we were cutting have been sitting out awhile (yellow pine, 6-10 months) but the blades we used were brand new. If anyone has any ideas or could explain why I am getting such a rough cut I would appreciate the help.
(Sawing and Drying Forum)
From contributor A:
On dry logs that is not uncommon. I see it on western red cedar a lot. Cut some old eastern white pine logs from a log home and the grain raised on it. Put on a fresh red oak and see how good it cuts.
The 158 is the blade length in inches, the 9 is the degree of hook. Woodmizer sells 4, 7, 9, 10 and 12 degree blades. Generally, the harder/knottier/drier a log is the lower a hook angle you would want to use. So if you are cutting relatively seasoned pine with a 10 degree blade, it will 'rough up' the lumber more. If you use Woodmizer's blade selector as listed on their website, you will see recommendations for 4, 9 and 10 degree blades in .045 and .055 thicknesses as well as 1 1/4 and 1 1/2 inch widths. If you have a lot of those logs to cut and if the surface is unacceptably rough and if fresh logs cut fine, you might want to consider changing the blade settings.