Just a thought; maybe your saw requires a 300 mm blade rather than a 12 inch?
The popular view is the two sizes are interchangeable but there is a small difference in diameter with the Imperial blade being about a quarter inch bigger than the metric.
I had a similar problem with an eight inch saw. When I fitted an eight inch blade it seemed to be ok but when switched on it made a loud noise, similar to yours I guess.
I was unwilling to buy another blade so I modified the saw to give the blade housing a little more clearance so I could use the eight inch.
SOURCE: Makita 10" Compound Miter Saw LS1040 manual?
Here you go.
This is the ls1040
http://www.makita.com/en-us/Assets/images/Products/LS1040/owners_manuals/LS1040.pdf
This is the ls1040f
http://www.makita.com/en-us/Assets/images/Products/LS1040F/owners_manuals/LS1040.pdf
SOURCE: loose replacement blade
I completely removed the blade and put it back on, tightening the locknut, and now it works perfectly. The blade has not come loose and have used the machine for the last 3 months. The only thing I can think of is that somehow I didn't have the blade correctly installed in the first place, although it didn't wobble or anything.
SOURCE: hi, my dewalt 12 inch double bevel, is making a
This sounds like a problem with the electric brake on the motor.
SOURCE: Changing the blade
there is a nut holding the blade in the center , it is left handle thread , there should be a locking mechanism to hold the blade while you unscrew the nut
SOURCE: I have a dewalt 706 miter saw and the blade brake
this is a replaceable part and they do wear out
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