It's been a long time since I tuned my jointer. Today, I noticed some "fla
t spots" on the knives. I removed and sharpened them using the scary sharp
method and a Lee Valley blade holder for doing this. They are now sharp, b
ut I didn't try to get them razor sharp because they won't hold that edge w
hen jointing wood.
I installed the knives so that the difference in height across a blade is
about .002 in. I then adjusted the blades so that the max difference for t
he 3 blades as they rotated on the cutter head was about .003 inches.
I then set the height of the tables and ran a test board of kiln dried popl
ar through. I does create a flat board, but I always listen for the sound
of a machine as it runs. It sounds like the wood chipper I use when mulchi
ng garden and tree stuff in the Fall. The cutting depth was slightly less
than 1/16 inch.
Is the jointer ok or,are the blades not sharp enough or, are the adjust
ment tolerances too generous?
Sharpness is relative, and would be my first inclination to check. Did
it make the same noise with the stock running in either direction?
Did you try decreasing the cutting depth? Around 1/16" is a strong cut,
depending upon the stock.
I'm with you on the sound of things running, but the proof is in the
pudding and the state of the surface of the face/edge you joined should
tell the tale, and be the judge.
If reaches the standard you want in a "freshly jointed" edge,
particularly on stock with some grain changes. A bit of noise (without
smoke <g>) would not concern me all that much as long as the jointed
surface needs no further work/milling/sanding, etc.
On 5/22/2014 4:22 PM, Len wrote:
"flat spots" on the knives. I removed and sharpened them using the scary
I've gone to using a homemade jig w/ a set of magnets so I can't say
just how close they would mic but I'd think the heights would be better
than 3-thou a little.
I'm wondering w/ that kind of noise description--you didn't reverse them
by any chance and got wrong bevel side up?
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