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Alsayyed
Alsayyed's picture
Blades is coming off the wheel

Hello friends, I have a question dose this happen to you on MX 34 or any saw mill. After cutting a slab I need to return the saw to start from beginning if the blade hit the tip of log suddenly the blade comes out of the wheel it happen several times , unless I raise carriage little ¼ up and then pull the saw. Could anybody tell why or it is normal.

Thank you.

Bill
Bill's picture

It must be catching the log I don't have that problem because I always raise the head before sending  the carriage back with a good shove and anything sticking up a bit could knock the blade off.

wayne busse
wayne busse's picture

 Bill is right, one of the first things you learn is to raise the head enough to clear the cant before returning the sawhead  back down the mill. Two things can cause the blade to drop below the cant at the end of the cut. One is that the blade is climbing in the cut . Tension on the bade wants to keep the blade running straight but if the grain of the wood runs at an angle it can  pull the blade up or down.  If it happens on every cut, the blade may be angled up in front.  Norwood mills have no adjustment to  align the blade from front to back, the only thing that might help is to change the tracking.  Tension in the log can cause the cant to bow up or down as a slab of wood is cut  off and can cause this, but I usually see this after the cant is less than half size. 

As long as you are getting straight cuts without raises or dips and the board or slab is the same thickness on both ends, it's not a problem unless you can't remember to raise the head after each cut. I try to repeat the same sequence on each cut, let off a little on the throttle in the last inch of the cut to prevent back firing, then  raise the head a little and return the head back to the end of the mill before removing the board off the cant.  Soon, it will become habit.  On more sophisticated " expensive" mills with electronic controls , the head is raised automatically before returning.

 Ahmed what type off wood was the table top made of ? Is was beautiful with the contrast between heart and sap wood.

r.garrison1
r.garrison1's picture

I've had this happen with my LM29 a few times.

If I am cutting a full width log, and the cut is good, I stop while the back of the blade is still on the log, but the slab is cut. I can then return the head without moving the head up.

If I take the blade past the log, there is a chance that when I bring the head back, the back of the blade will catch a bit, and that is all it takes to pull the blade off the wheels.

If I am cutting a rough top edge, and there is bark, protruding limb stubs, or anything, they will almost always pull the blade off the wheels.

to avoid this, I lift the blade about 1/8 of a turn.

 

eddiemac
eddiemac's picture

I seldom lift the blade to bring the mill back, but I will slow down near the end of the cut so it doesn't take so long for the blade to stop moving when past the end (this also seems to allow the cut to rise some if it's been diving).  With the blade motionless or nearly so, I pull back to the log and check to see if the blade will clear.  If the blade has sunk, I'll sometimes manually lift it over the end and pull the mill back, if easily done.  Usually the same pattern repeats in subsequent cuts (due primarily to blade problems, but I guess it can be the log).  So if early cuts clear the log end, I'll be less careful with the rest and go ahead and pull back without letting the blade come to rest, though barely creeping over the end.  The better the sharpening and setting, the less dive and rise, but I know some logs are just difficult.  And don't expect new blades to solve all problems  -  set is sometimes off.  And then there's mill setup and alignment  .  .  .