That would depend on the grit, the wood (how much the wood holds), how
hard you press.
You have to think of it this way. the sandpaper feels sharp in the
beginning. Then it doesn't.. most of it does go the dust route. But
quite a bit is caught in the wood. Especially soft gummy woods, or open
How much you heat up and destroy the bond is part of it, how much
cutting you do is another part of the equation. If your just ripping one
or 2 pieces, maybe the dulling is light. But if you cutting a lot of
wood from the sanded pieces, it will affect your blade faster.
I would imagine your festool would be better than most... since it has
one of the better vac systems. But still guilty a little. But something
like my PC ROS, would be way worse. My Bosch 1/4 sheet not so good
Either way grit has a way of dulling tooling, when you have grit that is
not sharpening your tool.
I saw a butt load. I used to sand with 3M and Porter Cable before switching
to Festool paper.
I never have had my blades resharpened much more than every 2-3 years.
I have never used a paper with grit that breaks down, although garnet paper
will fracture and bread down. I only use aluminum oxide paper and have only
witnessed that paper's minerals/grit dull not fracture or flake off.
It makes sense that loose grit would full a blade but in my experience it
does not do so enough to give it a second thought.
I always give boards a blast of compressed air between grits and when
done sanding. Not 100% for grit removal, but can't be worse. This is not
done for concern for the saw blades, mostly for eliminating any problems
of a finer grit picking up a rock from the previous sanding pass and
You're too nice about it. I'm calling bullshit on the whole theory.
If there are tiny amounts of sandpaper grit embedding itself in the
grain of the wood, how come it's never shown up in the finish? Why
hasn't it interfered with each successive, finer grit of sanding? Why
can't I feel it against my skin when I'm checking each sanding? Why
does my sandpaper last so darn long if all the grit is breaking off and
getting stuck in the wood. Why? Because it's not happening.
The one caveat I will add is perhaps the OP got stuck using some of the
same terrible Harbor Freight bulk sandpaper that I bought, once....
once. Half the git would fall off that stuff just taking it out of the
cardboard box it came in. I called it single use sandpaper. That stuff
*did* leave grit all over whatever surface you were sanding, so perhaps
that's what the OP was using that caused this issue. Perhaps he wanted
to use up his whole inventory of the stuff instead of tossing it out and
buying decent sandpaper.
That's the only way I could even possibly ever even start to buy into
"Playing is not something I do at night, it's my function in life"
In all fairness, garnet paper is designed to fracture and form a smaller
grit on the paper as it is used. BUT that is old style paper and is not
used much any more, at least main stream.
Something dulls modern blades, wood, and with modern paper the effect is
insignificant to notice, in my experience.
I recall a couple of decades ago comments about mixing sanding dust with
glue to make a wood filler. There were comments about loose sanding
particles contaminating the mixture. I have not seen any recent
comments with this concern.
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