Well I don't know about the problem with the bent fence, may not be
fixable. But as to aligning the miter fence it is very tempermental.
Here are the steps I used.
1. As always move the saws angle and return it to the 0 degree detent,
wiggle it to make sure it is really seated.
2. Get yourself a good carpenters/framing square short side at least 12
inches long. Verify that it is truly 90 degrees and that it has two
straight edges. google "tuning carpenter square" for more info.
3. Verify that the fence is straight from one side to the other. It
does not have to be perfect prior to starting but, if one side is
curved or bowed you will never get a square cut. The two sides do not
have to be square to each other prior to starting as this can be
corrected in the alignment. It is notable that the fence is usually
very straight and you should not have to straighten it.
4. More or less center and snug one side of the fence the bolt should
not be tight but not easily moved either. (I will assume bolt 1 in
diagram 1. below (This is how Makita recommends)) Because of the system
of adjusting the fence in sloppy holes it is critical to start with one
side and move toward the other.
5. Use a carpenter/framing square, place the long end of the square
against the fence on the side you have snugged down. Adjust the
opposite end (near bolt 4) of the fence until the blade just barely
touches the square both near the fence and fully extended (This
adjustment should result in the number 4 bolt being close to centered
in its hole). At this point you should snug down the number 2 bolt.
6. Reverse your square as in diagram 2 so the long side is now on the
left side of the fence. At this point the fence should be close to
aligned and you should not have to adjust much to make the blade
lightly touch the square front and back (if it does require significant
change you either did not do the first side correctly or your fence is
not flat). Once you have it aligned snug down 3 recheck and snug 4.
7. Move the square back to the right and verify that nothing got mucked
up and tighten 1 then 2.
8. Again recheck the left side and tighten 3 and 4. This should result
in a very square saw.
I tried to draw some diagrams.
4 3 2 1 4 3 2 1
||| Square Square |||
||| Right Left |||
||| Side Side |||
Hopefully all of this helps. Took me forever to get a consistent
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