I'm a newbie who is about to pick up a 10" Dewalt 744s table saw. I'm
thinking about purchasing a dado set for that saw but notice that the
sets seem to come in 6" and 8" standard sizes. I'm assuming that the 8"
set will remain sharper for a longer period of time and will cut a
deeper groove with the table saw. However, I would think the 6" blade
set would reduce stress on the saw motor since it would take less to get
the smaller blades cutting. Am I correct in assuming these things? Is
the 8" size more efficient?
The dado set would not get heavy duty use nor be used on large projects.
In fact, I doubt I'd be cutting gooves wider than 1/4" and maybe 1/2"
deep maximum. Is there any reason to choose one set over the other?
Thanks for any info.
I bought mine from Ridge Carbide at a show. The owner told me the 6" are
lighter and needed for low powered saws like the direct drive ones. The 8"
is good for any saw with 1.5 hp or larger motor. I bought the 8".
You certainly know enough physics to know that an 8" dado set spinning at
say 3000 RPM has more kinetic energy than a 6" dado set due to it's higher
mass and greater diameter.
That is the "flywheel effect" that you are talking about.
However, once that energy has been expended by cutting wood then the 8"
blade poses a bigger load on the motor than the 6" blade set. So your claim
certainly is correct for cutting short dado's and incorrect for any cut
where the energy required to make the cut is substantially greater than the
kinetic energy stored in the spinning blade.
I'm not about to conduct tests using both kinds of dados on low powered saw
since I only have an 8" blade and a 3HP saw. But I would guess that a deep
dado in say a 3' panel would be more than enough to show the difference.
While a shallow dado 3" long would not.
Along with the other points already mentioned, a 6" usually won't
work with a sled. If years from now you've never used a sled, the 6"
will have served you well, otherwise, you'll have also bought an 8"
Once you dado a case side with a sled, you'll never dado without the
As I am also upgrading my shop with a new table saw(Grizz 1023SL) could
someone post the definition of a sled and what the advantages/uses are?
I've done a lot of woodwork but until now had only the basics.
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