I typically see 8" dados used for 10" table saws. I guess you can use
6-inchers too. For a 16" RAS would you go to 14" or could I drop down
to say 10 or 12 inches? A 14" stack looks to cost about $500 new.
Better start checking the auctions...
Reason you normally only find 8" for 5/8" arbor is that a wide stack is
a lot of material to move. Particularly on a RAS, the force to
counteract that in the normal climb-cutting mode can be formidable. I'd
recommend staying w/ the smallest diameter that will provide sufficient
clearance below the head to provide the depth of cut required. I also
recommend extreme care w/ large dado set on a RAS of that size although
I use a RAS extensively as a cutoff machine and in the past have had one
as the only saw in the shop.
How deep of a dado do you need to cut? There are probably very few
occasions when a small dado set would not be adequate, and a small
diameter will put less stress on your motor (though that is probably
not a concern on a 16" RAS). I think your main trouble will be finding
a good used set with a large enough arbor hole.
For a 16" RAS, the motor casing clearance is a major consideration of
what clearance a small diameter blade is going to have...
Any blade can be rebored to a larger arbor diameter pretty
inexpensively, so that really isn't a major consideration.
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